1 GNU Autoconf NEWS - User visible changes.
3 * Major changes in Autoconf 2.64 (????-??-??) [stable]
4 Released by Eric Blake, based on git versions 2.63.*.
6 ** The manual is now shipped under the terms of the GNU FDL 1.3.
8 ** AC_REQUIRE now detects the case of an outer macro which first expands
9 then later indirectly requires the same inner macro. Previously,
10 this case led to silent out-of-order expansion (bug present since
11 2.50); it now issues a syntax warning, and duplicates the expansion
12 of the inner macro to guarantee dependencies have been met. See
13 the manual for advice on how to refactor macros in order to avoid
14 the bug in earlier autoconf versions and avoid increased script
15 size in the current version.
17 ** AC_DEFUN_ONCE has improved semantics. Previously, a macro declared
18 with AC_DEFUN_ONCE warned on a second invocation; and out-of-order
19 expansion was still possible. Now, dependencies are guaranteed,
20 and subsequent invocations are a silent no-op. This makes
21 AC_DEFUN_ONCE an ideal macro for silencing AC_REQUIRE warnings.
23 ** The following macros are now defined with AC_DEFUN_ONCE. This means
24 a subtle change in semantics; previously, an AC_DEFUN macro could
25 expand one of these macros multiple times or surround the macro
26 inside shell conditional text to bypass the effects of these
27 macros, but now the macro will expand exactly once, and prior to
28 the start of any enclosing AC_DEFUN macro:
29 AC_CANONICAL_BUILD AC_CANONICAL_HOST AC_CANONICAL_TARGET
30 AC_HEADER_ASSERT AC_PROG_INSTALL AC_PROG_MKDIR_P
31 AC_USE_SYSTEM_EXTENSIONS
33 ** AC_LANG_ERLANG works once again (regression introduced in 2.61a).
35 ** AC_HEADER_ASSERT is fixed so that './configure --enable-assert' no
36 longer mistakenly disables assertions.
38 ** AC_INIT now takes an optional fifth parameter that can be used to
39 set AC_PACKAGE_URL, a URL for the package's home page; the URL is
40 used in `configure --help' and is also available via AC_DEFINE.
42 ** Autotest testsuites accept an option --jobs[=N] for parallel testing.
44 ** Autotest testsuites do not attempt to write startup error messages
45 to the log file before that is opened (regression introduced in 2.63).
47 ** Configure scripts now use shell functions.
49 ** Present But Cannot Be Compiled: Autoconf will now proceed with
50 the compiler's result if a header is present but cannot be compiled.
51 The warning is still printed, and you should really fix it by
52 providing a fourth parameter to AC_CHECK_HEADER/AC_CHECK_HEADERS.
54 ** Autoreconf added aclocal to the set of programs affected by the
55 `autoreconf -I dir' option.
57 ** The following documented m4sugar macros are new:
58 m4_chomp m4_curry m4_default_quoted m4_esyscmd_s m4_map_args
59 m4_map_args_pair m4_map_args_sep m4_map_args_w m4_set_map
60 m4_set_map_sep m4_stack_foreach m4_stack_foreach_lifo
61 m4_stack_foreach_sep m4_stack_foreach_sep_lifo
63 ** The following m4sugar macros are documented now, but in some cases
64 with slightly different semantics than what the previous
65 undocumented version had:
66 m4_copy m4_dumpdefs m4_rename m4_version_prereq
68 ** The m4sugar macro m4_expand has been taught to handle unterminated
69 comments and shell case statements. As a result, it is used
70 internally in more places, such as AC_DEFINE and AT_CHECK. Most
71 uses of AC_DEFINE and AT_CHECK should not behave any differently;
72 however, it may be necessary to add double-quoting around
73 unbalanced `(' where single-quoting used to be sufficient.
75 ** The following documented m4sh macros are new:
76 AS_LINENO_PREPARE AS_ME_PREPARE AS_SET_STATUS AS_VAR_APPEND
77 AS_VAR_ARITH AS_VAR_COPY
79 ** The following m4sh macros are documented now, but in some cases
80 with slightly different semantics than what the previous
81 undocumented version had:
82 AS_ECHO AS_ECHO_N AS_EXIT AS_LITERAL_IF AS_UNSET AS_VAR_IF
83 AS_VAR_POPDEF AS_VAR_PUSHDEF AS_VAR_SET AS_VAR_SET_IF
84 AS_VAR_TEST_SET AS_VERSION_COMPARE
86 ** The m4sh macros AS_IF and AS_CASE can now be used in shell lists.
87 The responsibility for supplying a trailing newline now belongs to
88 the call site, but since most users did not add dnl, this generally
89 results in fewer empty lines in configure.
92 * Major changes in Autoconf 2.63 (2008-09-09) [stable]
93 Released by Eric Blake, based on git versions 2.62.*.
95 ** AC_C_BIGENDIAN does not mistakenly report "universal" for some
96 bigendian hosts, a regression introduced with universal binary
99 ** AC_PATH_X now includes /lib64 and /usr/lib64 in its list of default
102 ** AC_USE_SYSTEM_EXTENSIONS no longer conflicts with an external
103 AC_DEFINE([__EXTENSIONS__]). This fixes a regression introduced in
104 2.62 when using macros such as AC_AIX that were made obsolete in
105 favor of the more portable AC_USE_SYSTEM_EXTENSIONS.
107 ** AC_CHECK_TARGET_TOOLS is usable in the non-cross-compile case.
109 ** Newly obsolete macros
110 The following macro has been marked obsolete, since current porting
111 targets can safely assume C89 semantics that signal handlers return
112 void. We have no current plans to remove the macro.
116 ** The macros m4_map and m4_map_sep now ignore any list elements
117 consisting of just empty quotes, and m4_map_sep now expands its
118 separator. This fixes a regression in 2.62 when these macros were
119 first documented, for the sake of clients expecting the semantics
120 that these macros had prior to that time. The new macros m4_mapall
121 and m4_mapall_sep, along with extra quoting of the separator, can
122 be used to get the semantics that m4_map_sep had in 2.62.
124 ** Clients of m4_expand, such as AS_HELP_STRING and AT_SETUP, can now
125 handle properly quoted but otherwise unbalanced parentheses (for
126 some macros, this fixes a regression in 2.62).
128 ** Two new quadrigraphs have been introduced: @{:@ for (, and @:}@ for ),
129 allowing the output of unbalanced parentheses in more contexts.
131 ** The following m4sugar macros are new:
132 m4_cleardivert m4_joinall m4_mapall m4_mapall_sep m4_reverse
133 m4_set_add m4_set_add_all m4_set_contains m4_set_contents
134 m4_set_delete m4_set_difference m4_set_dump m4_set_empty
135 m4_set_foreach m4_set_intersection m4_set_list m4_set_listc
136 m4_set_remove m4_set_size m4_set_union
138 ** The following m4sugar macros now accept multiple arguments, as is the
139 case with underlying m4:
140 m4_defn m4_popdef m4_undefine
142 ** The following m4sugar macros now guarantee linear scaling; they
143 previously had linear scaling with m4 1.6 but quadratic scaling
144 when using m4 1.4.x. All macros built on top of these also gain
145 the scaling improvements.
146 m4_bmatch m4_bpatsubsts m4_case m4_cond m4_do m4_dquote_elt
147 m4_foreach m4_join m4_list_cmp m4_map m4_map_sep m4_max
150 ** AT_KEYWORDS once again performs expansion on its argument, such that
151 AT_KEYWORDS([m4_if([$1], [], [default])]) no longer complains about
152 the possibly unexpanded m4_if [regression introduced in 2.62].
154 ** Config header templates `#undef UNDEFINED /* comment */' do not lead to
155 nested comments any more; regression introduced in 2.62.
158 * Major changes in Autoconf 2.62 (2008-04-05) [stable]
159 Released by Eric Blake, based on git versions 2.61a.*.
161 ** Many optimizations have been applied to make overall execution faster.
163 ** Autotest now makes use of shell functions.
165 ** config.status now uses awk instead of sed also for config headers.
167 - As a side effect, AC_DEFINE and AC_DEFINE_UNQUOTED now handle multi-line
168 values, i.e., backslash-newline combinations are handled correctly.
169 Further, for config headers, the total size of values is not limited by
170 the POSIX length limit of text lines any more, only each single line.
172 ** New config variable `top_build_prefix'.
174 ** New Autoconf macros:
175 AC_AUTOCONF_VERSION AC_OPENMP AC_PATH_PROGS_FEATURE_CHECK
177 ** AC_C_BIGENDIAN now supports universal binaries a la Mac OS X.
179 ** AC_C_RESTRICT now prefers to #define 'restrict' to a variant spelling
180 like '__restrict' if the variant spelling is available, as this is
181 more likely to work when mixing C and C++ code.
183 ** AC_CHECK_ALIGNOF's type argument T is now documented better: it must
184 be a string of tokens such that "T y;" is a valid member declaration
187 ** AC_CHECK_SIZEOF now accepts objects as well as types: the general rule
188 is that sizeof (X) works, then AC_CHECK_SIZEOF (X) should work.
190 ** AC_CHECK_TYPE and AC_CHECK_TYPES now work on any C type-name; formerly,
191 they did not work for function types. In C++, they now work on any
192 type-id that can be the operand of sizeof; this is similar to C,
193 except it excludes anonymous struct and union types. Formerly,
194 some (but not all) C++ types involving anonymous struct and union
195 were accepted, though this was not documented.
197 ** AC_CONFIG_LINKS now prefers to link against files in the build tree
198 if found, and it works to link against a file of the same name in
199 the source tree, even if both trees coincide.
201 ** AC_INIT no longer alters $@; regression introduced in 2.60.
203 ** AC_USE_SYSTEM_EXTENSIONS now defines _ALL_SOURCE for Interix platforms.
205 ** AS_HELP_STRING no longer underquotes its first argument; it also handles
206 the case where the first argument contains single-quoted commas.
207 For example, "AS_HELP_STRING([-a, [--arg[=foo]]], [bar])" produces:
208 " -a, --arg[=foo] bar"
209 Additionally, the macro now takes two additional arguments,
210 indent-column and wrap-column; these should not normally be needed,
211 but can be used to fine-tune how the output text is wrapped.
213 ** AC_PROG_INSTALL now requires an install program that can install multiple
214 files into a target directory.
216 ** The command 'autoconf -' now correctly processes a file from stdin.
218 ** 'autoreconf -m' now honors $MAKE.
220 ** For all of the directory arguments for 'configure', such as '--prefix'
221 or '--bindir', trailing slashes are stripped. As an example, if
222 tab completion in the user's shell appends trailing slashes, the
223 command './configure --prefix=/usr/' will still result in an
224 expanded libdir value of /usr/lib, not /usr//lib.
226 ** `configure --help=recursive' now works in read-only trees and from
227 unconfigured build trees.
229 ** If precious variables differ only in whitespace, then the cache consistency
230 check warns instead of fails, and reuses the old value.
232 ** AT_BANNER is now documented.
234 ** AT_SETUP now handles macro expansions properly when calculating line
237 ** Autotest now determines $srcdir correctly.
239 ** Testsuites built by autotest now accept a -C/--directory=DIR option
240 to adjust the working directory prior to creating files.
242 ** Autoconf now requires GNU M4 1.4.5 or later. Earlier versions of M4 have
243 a bug in macro tracing that interferes with the interaction between
244 Autoconf and Automake. GNU M4 1.4.11 or later is recommended. The
245 configure search for a working M4 is improved.
247 ** For portability with the eventual M4 2.0, macros should no longer use
248 anything larger than $9 to refer to arguments.
250 ** Documentation for m4sugar is improved.
252 - The following macros were previously available as undocumented
253 interfaces; the macros are now documented as stable interfaces.
255 __oline__ m4_assert m4_bmatch m4_bpatsubsts m4_car m4_case
256 m4_cdr m4_default m4_divert_once m4_divert_pop m4_divert_push
257 m4_divert_text m4_do m4_errprintn m4_fatal m4_flatten
258 m4_ifndef m4_ifset m4_ifval m4_ifvaln m4_location
259 m4_n m4_shiftn m4_strip m4_warn
261 - The following macros were previously available as undocumented
262 interfaces, but had bug fixes or semantic changes as part of this
263 release. Packages that relied on the undocumented behavior
264 should be analyzed to make sure they will still work with the
265 new documented behavior.
267 m4_cmp m4_list_cmp m4_join m4_map m4_map_sep m4_sign
268 m4_text_box m4_text_wrap m4_version_compare
270 - The m4_wrap macro used to have unspecified order, but now
271 guarantees FIFO order. m4_wrap_lifo was added to guarantee LIFO
274 - Packages using the undocumented m4sugar macro m4_PACKAGE_VERSION
275 should consider using the new AC_AUTOCONF_VERSION instead.
277 - m4sugar macros that are not documented in the manual are still
278 deemed experimental, and should not be used outside of Autoconf.
280 ** The m4sugar macros m4_append and m4_append_uniq, first documented in
281 2.60, have been fixed to treat both the string and the separator
282 arguments consistently with regards to quoting. Prior to this fix,
283 m4_append_uniq could mistakenly duplicate entries if the expansion
284 of the separator resulted in a different string (for example, if it
285 contained quotes, a comma, or a macro name). However, it means
286 that programs previously using
287 m4_append([name], [string], [[, ]])
288 are now using a four-character separator instead of the intended
289 comma and space. If you need portability to earlier versions of
290 Autoconf, you can insert the following snippet after AC_INIT but
291 before any other macro expansions, to enforce the new semantics:
292 m4_pushdef([m4_append], [m4_define([$1],
293 m4_ifdef([$1], [m4_defn([$1])[$3]])[$2])])
294 Additionally, m4_append_uniq now takes optional parameters that can
295 be used to take action depending on whether anything was appended,
296 and warns if a non-empty separator occurs within the string being
297 appended, since that can lead to duplicates.
299 ** The following m4sugar macros are new:
300 m4_append_uniq_w m4_apply m4_combine m4_cond m4_count
301 m4_dquote_elt m4_echo m4_expand m4_ignore m4_make_list m4_max
302 m4_min m4_newline m4_shift2 m4_shift3 m4_unquote m4_wrap_lifo
304 ** Warnings are now generated by default when an installer invokes
305 'configure' with an unknown --enable-* or --with-* option.
306 These warnings can be disabled with the new AC_DISABLE_OPTION_CHECKING
307 macro, or by invoking 'configure' with --disable-option-checking.
309 ** Existing obsolete macros
310 The documentation for the following macros is adjusted to make it
311 more clear that they have previously been marked obsolete, as their
312 functionality can be accomplished by other macros. We have no
313 current plans to remove them from Autoconf.
315 AC_ENABLE AC_STRUCT_ST_BLKSIZE AC_STRUCT_ST_RDEV AC_WITH
317 ** Newly obsolete macros
318 The following macros have been marked obsolete, as they only
319 perform a subset of AC_USE_SYSTEM_EXTENSIONS. We have no current
320 plans to remove them.
322 AC_AIX AC_GNU_SOURCE AC_ISC_POSIX AC_MINIX
324 ** AC_C_LONG_DOUBLE is obsolescent.
325 The documentation now says that AC_C_LONG_DOUBLE is obsolescent: it
326 tests for problems that are so old that it is no longer of
327 practical importance on current systems. New programs need not use
328 AC_C_LONG_DOUBLE. We have no current plans to remove it.
330 ** AC_DIAGNOSE, AC_WARNING, and AC_FATAL are obsolescent.
331 The documentation now favors the use of M4sugar macros m4_warn and
332 m4_fatal, since the naming makes it more obvious that the
333 diagnostics are associated with M4 expansion (ie. when running
334 `autoconf'), and offers less confusion with the AC_MSG_ERROR,
335 AC_MSG_FAILURE, and AC_MSG_WARN macros which manage diagnostics
336 when running `configure'. We have no current plans to remove these
340 * Major changes in Autoconf 2.61a (2006-12-11)
342 ** AC_FUNC_FSEEKO was broken in 2.61; it didn't make fseeko and ftello visible
343 on many platforms. This has been fixed.
345 ** AC_FUNC_SETVBUF_REVERSED is now obsolete. It is still defined for backward
346 compatibility but it does nothing. The macro was already
347 obsolescent, as the last systems to have the problem were those
348 based on SVR2, which became obsolete in 1987. The macro had bugs
349 on some modern systems and could no longer be maintained reliably
350 due to lack of ancient systems to test it on.
352 ** config.status now uses awk instead of sed for most substitutions, for speed.
354 - As a side effect multi-line values of substituted variables no
355 longer have a small limit in total size, though for portability
356 each line should not exceed the POSIX length limit for text lines.
358 - It is now documented that Makefile.in should not contain
359 overlapping variable occurrences, e.g., @VAR1@VAR2@.
360 Autoconf's behavior was always iffy in such cases, and the
361 awk implementation has changed the behavior.
363 ** Many uses of 'echo' have been rewritten so that Autoconf-generated
364 scripts have fewer problems with strings or file names containing
365 embedded special characters such as backslash or leading "-". This
366 was implemented by using `printf '%s\n' "$foo"' instead of `echo
367 "$foo"' when printf works. Due to the implementation technique
368 used, Autoconf-generated scripts now run considerably more slowly
369 on ancient implementations lacking printf. However, this should
370 not be a problem, since Autoconf-generated scripts in practice
371 invariably find a more-modern shell these days.
374 * Major changes in Autoconf 2.61 (2006-11-17)
376 ** New macros AC_C_FLEXIBLE_ARRAY_MEMBER, AC_C_VARARRAYS.
378 ** AC_ARG_ENABLE and AC_ARG_WITH now allow '.' in feature and package names.
381 * Major changes in Autoconf 2.60b (2006-10-22)
384 Autoconf-generated shell scripts no longer export BIN_SH, due to
385 configuration hassles with this. Installers who need BIN_SH in
386 their environment should set it before invoking 'configure' and
387 'make'. As far as we know, this affects only Unixware installations.
389 ** Obsolescent macros
390 The documentation now says that the following macros are obsolescent,
391 as they are superseded by Gnulib:
393 AC_FUNC_FNMATCH AC_FUNC_FNMATCH_GNU AC_FUNC_GETLOADVG AC_REPLACE_FNMATCH
395 New programs should use the Gnulib counterparts of these macros.
396 We have no current plans to remove them from Autoconf.
398 ** AC_COMPUTE_INT no longer caches or reports results.
400 ** AC_CHECK_DECL now also works with aggregate objects.
402 ** AC_USE_SYSTEM_EXTENSIONS now defines _TANDEM_SOURCE for NonStop platforms.
404 ** GNU M4 1.4.7 or later is now recommended.
407 New M4sugar macro, which is more secure than the POSIX M4 maketemp.
410 Now an alias for m4_mkstemp.
412 * Major changes in Autoconf 2.60a (2006-08-25)
414 ** GNU M4 1.4.6 or later is now recommended.
416 ** The check for C99 now tests for varargs macros, as documented.
417 It also tests that the preprocessor supports 64-bit integers.
419 ** Autoconf now uses constructs like "#ifdef HAVE_STDLIB_H" rather than
420 "#if HAVE_STDLIB_H", so that it now works with "gcc -Wundef -Werror".
422 ** The functionality of the undocumented _AC_COMPUTE_INT is now provided
423 by a public and documented macro, AC_COMPUTE_INT. The parameters to the
424 two macros are different, so autoupdate will not change the old private name
425 to the new one. _AC_COMPUTE_INT may be removed in a future release.
427 ** AC_TYPE_LONG_LONG_INT and AC_TYPE_UNSIGNED_LONG_LONG_INT now require
428 that long long types be at least 64 bits wide, as C99 and tradition
429 requires. Formerly, they accepted implementations of any width.
432 * Major changes in Autoconf 2.60
434 Released 2006-06-23, by Ralf Wildenhues.
436 ** Autoconf no longer depends on whether m4wrap is FIFO (as Posix requires)
437 or LIFO (as in GNU M4 1.4.x). GNU M4 2.0 is expected to conform to Posix
438 here, so m4wrap/m4_wrap users should no longer depend on LIFO behavior.
440 ** Provide a way to turn off warnings about the changed directory variables.
442 * Major changes in Autoconf 2.59d
444 Released 2006-06-05, by Ralf Wildenhues.
446 ** GNU make now recommended for VPATH builds
447 INSTALL now suggests VPATH builds (e.g., "sh ../srcdir/configure")
448 only if you use GNU make. In practice, other 'make' implementations
449 have too many subtle incompatibilities in their support for VPATH.
450 Many packages (including Autoconf itself) are portable to other
451 'make' implementations, but some packages are not, and recommending
452 GNU make keeps the installation instructions simpler.
454 ** Even more safety checks for the new Directory variables:
455 Warn about suspicious `${datarootdir}' found in config files output.
457 ** AC_TRY_COMMAND, AC_TRY_EVAL, ac_config_guess, ac_config_sub, ac_configure
458 These never-documented macros and variables have been marked with
459 comments saying that they may be removed in a future release,
460 because their use can lead to unintended code being executed.
461 If you need functionality that only these macros or variables
462 currently supply, please write bug-autoconf@gnu.org.
464 ** AC_SUBST, AC_DEFINE
465 Literal arguments to these are passed to m4_pattern_allow now.
468 Passing 'ac_cv_prog_cc_stdc=no' to 'configure' now sets ac_cv_prog_cc_c99
469 and ac_cv_prog_cc_c89 to 'no' as well, for backward compatibility with
470 obsolete K&R tests in the Automake test suite.
479 Now more robust with special characters in file names, or when
480 multiple processes create the same directory at the same time.
482 ** Obsolescent macros
483 The documentation now says that the following macros are obsolescent:
484 they test for problems that are so old that they are no longer of
485 practical importance on current systems.
487 AC_C_BACKSLASH_A AC_FUNC_MEMCMP AC_HEADER_DIRENT
488 AC_C_CONST AC_FUNC_SELECT_ARGTYPES AC_HEADER_STAT
489 AC_C_PROTOTYPES AC_FUNC_SETPGRP AC_HEADER_STDC
490 AC_C_STRINGIZE AC_FUNC_SETVBUF_REVERSED AC_HEADER_SYS_WAIT
491 AC_C_VOLATILE AC_FUNC_STAT AC_HEADER_TIME
492 AC_FUNC_CLOSEDIR_VOID AC_FUNC_STRFTIME AC_ISC_POSIX
493 AC_FUNC_GETPGRP AC_FUNC_UTIME_NULL AC_PROG_GCC_TRADITIONAL
494 AC_FUNC_LSTAT AC_FUNC_VPRINTF AC_STRUCT_TM
496 New programs need not use these macros. We have no current plans to
500 For compatibility with future Libtool 2.0, autoreconf will invoke
501 libtoolize with the option `--ltdl' now, if LT_CONFIG_LTDL_DIR is
504 * Major changes in Autoconf 2.59c
506 Released 2006-04-12, by Ralf Wildenhues.
508 ** The configure command now redirects standard input from /dev/null,
509 to help avoid problems with subsidiary commands that might mistakenly
510 read standard input. AS_ORIGINAL_STDIN_FD points to the original
511 standard input before this redirection, if you really want configure to
512 read from standard input.
514 ** Directory variables adjusted to recent changes in the GNU Coding Standards.
515 The following directory variables are new:
517 datarootdir read-only architecture-independent data root [PREFIX/share]
518 localedir locale-specific message catalogs [DATAROOTDIR/locale]
519 docdir documentation root [DATAROOTDIR/doc/PACKAGE]
520 htmldir html documentation [DOCDIR]
521 dvidir dvi documentation [DOCDIR]
522 pdfdir pdf documentation [DOCDIR]
523 psdir ps documentation [DOCDIR]
525 The following variables have new default values:
527 datadir read-only architecture-independent data [DATAROOTDIR]
528 infodir info documentation [DATAROOTDIR/info]
529 mandir man documentation [DATAROOTDIR/man]
531 This means that if you use any of `@datadir@', `@infodir@', or
532 `@mandir@' in a file, you will have to ensure `${datarootdir}' is
533 defined in this file. As a temporary measure, if any of those are
534 found but no mention of `datarootdir', the substitutions will be
535 replaced with values that do not contain `${datarootdir}', and a
536 warning will be issued.
538 ** @top_builddir@ is now a dir name: it is always nonempty and doesn't have
539 a trailing slash. Similar change will be made to ac_top_builddir in a
540 future release; the old style value, which matches (../)*, is (and will
541 continue to be) available as ac_top_build_prefix.
544 New macro to check for support of 'typeof' syntax a la GNU C.
546 ** AC_CHECK_DECLS_ONCE, AC_CHECK_FUNCS_ONCE, AC_CHECK_HEADERS_ONCE
547 New "once-only" variants of commonly-used macros, to make 'configure'
548 smaller and faster in common cases.
551 New macro to check for strtold with C99 semantics.
554 New macro that lets builder disable assertions at 'configure'-time.
557 Now checks for X11/Xlib.h and XrmInitialize (X proper) rather than
558 X11/Intrinsic.h and XtMalloc (Xt).
560 ** AC_PRESERVE_HELP_ORDER
561 New macro that causes `configure' to display help strings for AC_ARG_ENABLE
562 and AC_ARG_WITH arguments in one region, in the order defined. The default
563 behavior is to group options of each classes separately.
565 ** AC_PROG_CC, AC_PROG_CXX
566 No longer automatically arrange to declare the 'exit' function of C,
567 when a C++ compiler is used. Standard Autoconf macros no longer use
568 'exit', so this is no longer an issue for them. If you use C++, and
569 want to call 'exit', you'll have to arrange for its declaration
570 yourself. But we now suggest you return from 'main' instead.
572 ** AC_PROG_CC_C89, AC_PROG_CC_C99
573 New macros for ISO C99 support. AC_PROG_CC_C89 and AC_PROG_CC_C99
574 check for ANSI C89 and ISO C99 support respectively.
577 Has been unobsoleted, and will check if the compiler supports ISO
578 C99, falling back to ANSI C89 if not. ac_cv_prog_cc_stdc is
579 retained for backwards compatibility, assuming the value of
580 ac_cv_prog_cc_c99 or ac_cv_prog_cc_c89 (whichever is valid, in
583 ** AC_STRUCT_DIRENT_D_INO, AC_STRUCT_DIRENT_D_TYPE
584 New macros for checking commonly-used members of struct dirent.
587 The substituted value can now contain newlines.
590 The substitution now occurs only when @variable@ is on a line by itself,
591 optionally surrounded by spaces and tabs. The whole line is replaced.
593 ** AC_TYPE_LONG_DOUBLE, AC_TYPE_LONG_DOUBLE_WIDER
594 New macros to check for long double, and whether it is wider than double.
595 The old macro AC_C_TYPE_LONG_DOUBLE has been marked as obsolete;
596 applications should switch to the new macro.
598 ** AC_TYPE_INT8_T, AC_TYPE_INT16_T, AC_TYPE_INT32_T, AC_TYPE_INT64_T,
599 AC_TYPE_INTMAX_T, AC_TYPE_INTPTR_T, AC_TYPE_LONG_LONG_INT, AC_TYPE_SSIZE_T,
600 AC_TYPE_UINT8_T, AC_TYPE_UINT16_T, AC_TYPE_UINT32_T, AC_TYPE_UINT64_T,
601 AC_TYPE_UINTMAX_T, AC_TYPE_UINTPTR_T, AC_TYPE_UNSIGNED_LONG_LONG_INT
602 New macros to check for C99 and POSIX types.
604 ** AC_USE_SYSTEM_EXTENSIONS
605 New macro to enable extensions to Posix.
608 New macro which is defined to the name of the first declared config header
609 or undefined if no config headers have been declared yet.
612 The macro correctly handles quadrigraphs now.
614 ** AS_BOURNE_COMPATIBLE, AS_SHELL_SANITIZE, AS_CASE
615 These macros are new or published now.
618 New macro for copyright notices in testsuite files.
620 ** ALLOCA, LIBOBJS, LTLIBOBJS
621 Object names added to these variables are now prefixed with `${LIBOBJDIR}',
622 as in `${LIBOBJDIR}alloca.o'. LIBOBJDIR is meant to be defined from
623 `Makefile.in' in case the object files lie in a different directory.
624 The LIBOBJDIR feature is experimental.
627 Supports --no-recursive now.
629 ** New macros to support Erlang/OTP.
630 New macros for configuring paths to Erlang tools and libraries:
631 AC_ERLANG_PATH_ERLC, AC_ERLANG_NEED_ERLC, AC_ERLANG_PATH_ERL,
632 AC_ERLANG_NEED_ERL, AC_ERLANG_CHECK_LIB, AC_ERLANG_SUBST_ROOT_DIR,
633 AC_ERLANG_SUBST_LIB_DIR.
635 New macros for configuring installation of Erlang libraries:
636 AC_ERLANG_SUBST_INSTALL_LIB_DIR, AC_ERLANG_SUBST_INSTALL_LIB_SUBDIR.
638 ** The manual now mentions Gnulib more prominently.
640 ** New macros to support Objective C.
641 AC_PROG_OBJC, AC_PROG_OBJCPP.
643 * Major changes in Autoconf 2.59b
645 Released 2004-08-20, by Paul Eggert.
648 New macro that computes the default alignment of a type.
650 ** AC_CHECK_TOOL, AC_PATH_TOOL, AC_CHECK_TOOLS
651 When cross-compiling, these macros will give a warning if the tool
652 is not prefixed. In the future, unprefixed cross tools will not
653 be detected; please consult the info documentation for information
654 about the reason of this change.
656 ** AC_CHECK_TARGET_TOOL, AC_PATH_TARGET_TOOL, AC_CHECK_TARGET_TOOLS
657 New macros that detect programs whose name is prefixed with the
658 target type, if the build type and target type are different.
660 ** AC_REQUIRE_AUX_FILE
661 New trace macro that declares expected auxiliary files.
664 New macro that tests for a grep program that accepts as a long a line
667 ** AC_PROG_EGREP, AC_PROG_FGREP
668 These macros now require AC_PROG_GREP, and try EGREP="$GREP -E" and
669 FGREP="$GREP -F" respectively if possible, or else run a path search for
670 a program that accepts as long a line as possible.
673 New macro that tests for a sed program that truncates as few characters
676 * Major changes in Autoconf 2.59
678 Released 2003-11-04, by Akim Demaille
680 ** ac_abs_builddir etc.
681 Absolute file names were actually relative in 2.58.
683 * Major changes in Autoconf 2.58
685 Released 2003-11-04, by Akim Demaille
688 core.* files are no longer removed, as they may be valid user files.
690 ** autoreconf and auxiliary directory
691 Autoreconf creates the auxiliary directory if needed. This is
692 especially useful for initial "bootstrapping" of fresh CVS checkouts.
694 ** AC_CONFIG_MACRO_DIR
695 Use this macro to declare the directory for local M4 macros for aclocal.
698 No longer includes twice the same file in LIBOBJS if invoked
701 ** AC_CONFIG_COMMANDS
702 The directory for its first argument is automatically created. For
705 AC_CONFIG_COMMANDS([src/modules.hh], [...])
707 $top_builddir/src/ is created if needed.
709 ** Autotest and local.at
710 The optional file local.at is always included in Autotest test suites.
713 The warnings are always issued, including with cached runs.
714 This became a significant problem since aclocal and automake can
715 run autoconf behind the scene.
717 ** autoheader warnings
718 The warnings of autoheader can be turned off, using --warning.
719 For instance, -Wno-obsolete disables the complaints about acconfig.h
720 and other deprecated constructs.
723 AC_C_RESTRICT, AC_INCLUDES_DEFAULT, AC_LANG_ASSERT, AC_LANG_WERROR,
726 ** AC_DECL_SYS_SIGLIST
730 Now checks that mktime is the inverse of localtime.
732 ** Improve DJGPP portability
733 The Autoconf tools and configure behave better under DJGPP.
735 ** Present But Cannot Be Compiled
736 New FAQ section dedicated to the mystic
738 configure: WARNING: pi.h: present but cannot be compiled
739 configure: WARNING: pi.h: check for missing prerequisite headers?
740 configure: WARNING: pi.h: proceeding with the preprocessor's result
743 ** Concurrent executions of autom4te
744 autom4te now locks its internal files, which enables concurrent
745 executions of autom4te, likely to happen if automake, autoconf,
746 autoheader etc. are run simultaneously.
749 Use of Libtool 1.5 and higher is encouraged. Compatibility with
750 Libtool pre-1.4 is not checked.
753 Testsuites no longer rerun failed tests in verbose mode; instead,
754 failures are logged while the test is run.
756 In addition, expected failures can be marked as such.
758 * Major changes in Autoconf 2.57
760 Released 2002-12-03 by Paul Eggert.
762 Bug fixes for problems with AIX linker, with freestanding C compilers,
763 with GNU M4 limitations, and with obsolete copies of GNU documents.
765 The Free Documentation License has been upgraded from 1.1 to 1.2.
767 * Major changes in Autoconf 2.56
769 Released 2002-11-15 by Akim Demaille.
771 One packaging problem fixed (config/install-sh was not executable).
773 * Major changes in Autoconf 2.55
775 Released 2002-11-14 by Akim Demaille.
779 Have your configure.ac checked by autoscan ("autoscan").
780 Try the warning options ("autoreconf -fv -Wall").
784 - AC_CHECK_HEADER, AC_CHECK_HEADERS
785 More information on proper use.
787 - Writing Test Programs
789 This sections explains how to write good test sources to use with
790 AC_COMPILE_IFELSE etc. It documents AC_LANG_PROGRAM and so forth.
792 - AC_FOO_IFELSE vs. AC_TRY_FOO
794 Explains why Autoconf moves from AC_TRY_COMPILE etc. to
795 AC_COMPILE_IFELSE and AC_LANG_PROGRAM etc.
799 - Is more robust to different Gettext installations.
801 - Produces messages (when --verbose) to be understood by Emacs'
804 - Supports -W/--warnings.
807 Once the GNU Build System reinstalled, run `./config.status
808 --recheck && ./config.status && make' if possible.
812 - Supports --cache, and --no-cache.
814 - ~/.autom4te.cfg makes it possible to disable the caching mechanism
815 (autom4te.cache). See `Customizing autom4te' in the documentation.
822 Support for the obsoleted options -m, --macrodir, -l, --localdir is
823 dropped in favor of the safer --include/--prepend-include scheme.
828 AC_COMPILER_IFELSE, AC_FUNC_MBRTOWC, AC_HEADER_STDBOOL,
829 AC_LANG_CONFTEST, AC_LANG_SOURCE, AC_LANG_PROGRAM, AC_LANG_CALL,
830 AC_LANG_FUNC_TRY_LINK, AC_MSG_FAILURE, AC_PREPROC_IFELSE.
833 Obsoleted macros are kept for Autoconf backward compatibility, but
834 should be avoided in configure.ac. Running autoupdate is advised.
837 - AC_DEFINE/AC_DEFINE_UNQUOTED
839 We have to stop using the old compatibility scheme --that tried to
840 avoid useless backslashes-- because Libtool 1.4.3 contains a
842 AC_DEFINE([error_t], [int],
843 [Define to a type to use for \`error_t' if it is not
844 otherwise available.])
846 We have to quote the single quotes and backslashes with \. The old
847 compatibility scheme saw that ` was backslashed, and therefore did
848 not quote the single quote... Failure. Hence, Autoconf 2.54 is not
849 compatible with Libtool. Autoconf 2.55 is, but in some cases might
850 produce more \ than wanted.
852 Please, note that in the future the same problem will happen with
853 AC_MSG_*: use `autoreconf -f -Wall'.
857 - Portability of the Autoconf package to Solaris.
859 - Spurious warnings caused by config.status.
860 This bug is benign, but painful: on some systems (typically
861 FreeBSD), warnings such as:
863 config.status: creating Makefile
864 mv: Makefile: set owner/group (was: 1357/0): Operation not permitted
866 could be issued. This is fixed.
869 Simultaneous executions of config.status are possible again.
871 - Precious variables accumulation
873 config.status could stack several copies of the precious variables
877 ** Plans for later versions
881 The compatibility hooks with the old scheme will be completely
882 removed. Please, advice/use `--build', `--host', and `--target'
885 - AC_CHECK_HEADER, AC_CHECK_HEADERS
887 The tests will be stricter, please make sure your invocations are
892 Shell functions will gradually be introduced, probably starting with
893 Autotest. If you know machines which are in use that you suspect
894 *not* to support shell functions, please run the test suite of
895 Autoconf 2.55 on it, and report the results to
896 bug-autoconf@gnu.org.
900 Special characters in AC_MSG_* need not be quoted. Currently,
901 Autoconf has heuristics to decide when a string is escaped, or has
902 to be escaped. This scheme is fragile, and will be removed; the
903 only risk is uglified messages. Please, run `autoreconf -f -Wall'
904 to find occurrences that will be affected.
906 * Major changes in Autoconf 2.54
908 Released 2002-09-13 by Akim Demaille.
912 - autoreconf no longer changes the version of the gettext/po/intl
913 support files. It now adds the files the correspond to the
914 AM_GNU_GETTEXT_VERSION declared in configure.ac.
916 Warning: It now relies on the 'autopoint' program, which is part
917 of GNU gettext 0.11.4 and newer.
919 Please note that you need to have a GNU gettext version that
920 corresponds at least to the AM_GNU_GETTEXT_VERSION declared
921 in configure.ac. You can upgrade to newer GNU gettext versions,
922 though, without needing to change configure.ac.
924 - The -I DIR or --include=DIR option now appends DIR to the include path
925 instead of prepending; this is for consistency with other GNU tools.
926 The new -B DIR or --prepend-include=DIR option has the old behavior.
931 Now handles all the gory details about LIBOBJS and LTLIBOBJS.
932 Please, remove lines such as
934 # This is necessary so that .o files in LIBOBJS are also
935 # built via the ANSI2KNR-filtering rules.
936 LIBOBJS=`echo $LIBOBJS|sed 's/\.o /\$U.o /g;s/\.o$/\$U.o/'`
938 and read the `AC_LIBOBJ vs LIBOBJS' section. Do not define U in
939 your Makefiles either.
941 - AC_CONFIG_LINKS now makes copies if it can't make links.
943 - AC_FUNC_FNMATCH now tests only for POSIX compatibility, reverting to
944 Autoconf 2.13 behavior. The new macro AC_FUNC_FNMATCH_GNU also
945 tests for GNU extensions to fnmatch, and replaces fnmatch if needed.
947 - AC_FUNC_SETVBUF_REVERSED no longer fails when cross-compiling.
949 - AC_PROG_CC_STDC is integrated into AC_PROG_CC.
951 - AC_PROG_F77 default search no longer includes cf77 and cfg77.
955 AC_C_BACKSLASH_A, AC_CONFIG_LIBOBJ_DIR, AC_GNU_SOURCE,
956 AC_PROG_EGREP, AC_PROG_FGREP, AC_REPLACE_FNMATCH,
957 AC_FUNC_FNMATCH_GNU, AC_FUNC_REALLOC, AC_TYPE_MBSTATE_T.
960 looks for getloadavg.c in the CONFIG_LIBOBJ_DIR.
963 Now defines HAVE_MALLOC to 0 if `malloc' does not work, and asks
964 for an AC_LIBOBJ replacement.
968 - Spurious complaints from `m4_bmatch' about invalid regular
969 expressions are suppressed.
971 - Empty top_builddirs are properly handled.
973 - AC_CHECK_MEMBER works correctly when the member is an aggregate.
976 Now colon in the optional path arguments are properly handled.
978 ** Improved portability
980 - Both Autoconf the package, and the scripts it produces, should run
981 more reliably with Zsh. Bear in mind it is the default Bourne shell
984 - Autoconf and the scripts it produces no longer assume the existence of
985 the obsolescent commands egrep and fgrep.
989 - Limitations of Make
993 The GNATS base moved to
994 http://bugs.gnu.org/cgi-bin/gnatsweb.pl?database=autoconf
995 (It is no longer available, though.)
1000 Now contains the list of ouput variables and files (AC_SUBST,
1003 * Major changes in Autoconf 2.53
1005 Released 2002-03-08 by Akim Demaille.
1009 Perl 5.005_03 or later is required: autom4te is written in Perl and is
1010 needed by autoconf. autoheader, autoreconf, ifnames, and autoscan are
1016 Argument requirements, output variables, defined macros.
1017 - M4sugar, M4sh, Autotest
1019 - Double quoting macros
1020 AC_TRY_CPP, AC_TRY_COMPILE, AC_TRY_LINK and AC_TRY_RUN.
1022 The Autoconf manual is now distributed under the terms of the GNU FDL.
1023 - Section `Hosts and Cross-Compilation'
1024 Explains the rationale for the 2.5x changes in the cross-compilation
1025 chain, and in the relationships between build, host, and target
1027 Emphasizes that `cross-compilation' == `--host is given'.
1028 If you are working on compilers etc., be sure to read this section.
1029 - Section `AC_LIBOBJ vs. LIBOBJS'
1030 Explains why assigning LIBOBJS directly is now an error.
1031 Details how to update the code.
1036 Now used instead of hard coded line numbers.
1037 This eases the comparison of `configure's, and diminishes the
1038 pressure over control version archives.
1039 Automatic replacement for shells that don't support this feature.
1040 - New output variables
1041 @builddir@, @top_builddir@, @abs_srcdir@, @abs_top_srcdir@, @abs_builddir@,
1046 Autoconf and Autotest modes are provided.
1051 New, used by the Autoconf suite to cache and speed up most processing.
1053 Supported by autom4te, autoconf and autoheader.
1055 Replaces --autoconf-dir and --localdir in autoconf, autoheader,
1056 autoupdate, and autoreconf.
1058 No longer passes --cygnus, --foreign, --gnits, --gnu, --include-deps:
1059 automake options are to be given via AUTOMAKE_OPTIONS.
1061 Runs gettextize and libtoolize when appropriate.
1063 --m4dir is no longer supported.
1065 Now runs only in the specified directories, defaulting to `.',
1066 but understands AC_CONFIG_SUBDIRS for dependent directories.
1067 Before, it used to run on all the `configure.ac' found in the
1069 Independent packages are properly updated.
1073 - The top level $prefix is propagated to the AC_CONFIG_SUBDIRS configures.
1075 Under the user pressure, $? is finally available. Probably a mistake.
1076 - AC_F77_LIBRARY_LDFLAGS now supports the HP/UX f90 compiler.
1077 - Precious variables accumulation
1078 config.status could stack several copies of the precious variables
1080 - AC_PATH_PROG and family.
1081 Works properly when given a literal path.
1083 Somewhere since 2.13, the result had been reversed.
1087 - AC_C_BIGENDIAN supports the cross-compiling case.
1088 - AC_C_BIGENDIAN accepts ACTION-IF-TRUE, ACTION-IF-FALSE, and
1089 ACTION-IF-UNKNOWN arguments. All are facultative, and the default
1090 for ACTION-IF-TRUE is to define WORDS_BIGENDIAN like AC_C_BIGENDIAN
1092 - AC_C_LONG_DOUBLE now succeeds only if `long double' has more range or
1093 precision than `double'.
1098 It now defines the preprocessor symbols PACKAGE_NAME,
1099 PACKAGE_TARNAME, PACKAGE_VERSION, PACKAGE_STRING, and
1103 Admits a fourth optional parameter: the tar name.
1105 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS.
1106 Provide the user with srcdir, ac_srcdir, ac_top_srcdir, ac_builddir,
1107 ac_top_builddir, ac_abs_srcdir, ac_abs_top_srcdir, ac_abs_builddir,
1108 ac_abs_top_builddir.
1110 - AC_CONFIG_COMMANDS, HEADERS, FILES, LINKS and AC_OUTPUT.
1111 Are much less expensive when using long lists of files.
1114 Works with shell variables, and non alphanumeric names.
1118 - AC_FUNC_STRERROR_R now sets STRERROR_R_CHAR_P, not HAVE_WORKING_STRERROR_R,
1119 because POSIX 1003.1-200x draft 7 says strerror_r returns int, not char *.
1121 - AC_FUNC_STRTOD substitutes POW_LIB.
1126 * Major changes in Autoconf 2.52
1128 Released 2001-07-18 by Akim Demaille.
1133 This feature was present in autoconf 2.50 but was not documented.
1134 For example, `@<:@' is translated to `[' just before output. This
1135 is useful when writing strings that contain unbalanced quotes, or
1136 other hard-to-quote constructs.
1137 - m4_pattern_forbid, m4_pattern_allow
1138 - Tips for upgrading from 2.13.
1139 - Using autoscan to maintain a configure.ac.
1142 - Now include stdint.h.
1143 - sys/types.h and sys/stat.h are guarded.
1144 - strings.h is included if available, and not conflicting with string.h.
1147 - The test suite is more robust and presents less false failures.
1148 - Invocation of GNU M4 now robust to POSIXLY_CORRECT.
1149 - configure accepts --prefix='' again.
1150 - AC_CHECK_LIB works properly when its first argument is not a
1152 - HAVE_INTTYPES_H is defined only if not conflicting with sys/types.h.
1153 - build_, host_, and target_alias are AC_SUBST as in 2.13.
1154 - AC_ARG_VAR properly propagates precious variables inherited from the
1155 environment to ./config.status.
1156 - Using --program-suffix/--program-prefix is portable.
1157 - Failures to detect the default compiler's output extension are less
1159 - `config.status foo' works properly when `foo' depends on variables
1160 set in an AC_CONFIG_THING INIT-CMD.
1161 - autoheader is more robust to broken input.
1162 - Fixed Fortran name-mangling and link tests on a number of systems,
1163 e.g. NetBSD; see AC_F77_DUMMY_MAIN, below.
1166 - AC_CHECK_HEADER and AC_CHECK_HEADERS support a fourth argument to
1167 specify pre-includes. In this case, the headers are compiled with
1168 cc, not merely preprocessed by cpp. Therefore it is the _usability_
1169 of a header which is checked for, not just its availability.
1170 - AC_ARG_VAR refuses to run configure when precious variables have
1172 - Versions of compilers are dumped in the logs.
1173 - AC_CHECK_TYPE recognizes use of `foo_t' as a replacement type.
1176 - AC_PATH_XTRA only adds -ldnet to $LIBS if it's needed to link.
1177 - AC_FUNC_WAIT3 and AC_SYS_RESTARTABLE_SYSCALLS are obsoleted.
1178 - AM_FUNC_ERROR_AT_LINE, AM_FUNC_FNMATCH, AM_FUNC_MKTIME,
1179 AM_FUNC_OBSTACK, and AM_FUNC_STRTOD are now activated.
1180 Be sure to read `Upgrading from Version 2.13' to understand why
1181 running `autoupdate' is needed.
1182 - AC_F77_DUMMY_MAIN, AC_F77_MAIN: new macros to detect whether
1183 a main-like routine is required/possible when linking C/C++ with
1184 Fortran. Users of e.g. AC_F77_WRAPPERS should be aware of these.
1185 - AC_FUNC_GETPGRG behaves better when cross-compiling.
1187 * Major changes in Autoconf 2.51
1188 There was no release of Autoconf 2.51 since some packagers had used
1189 this version number without permission to ship intermediary versions
1190 of 2.50. The version was skipped to avoid confusion.
1192 * Major changes in Autoconf 2.50
1194 Released 2001-05-21 by Akim Demaille.
1196 ** Lots of bug fixes
1197 There have been far too many to enumerate them here. Check out
1198 ChangeLog if you really want to know more.
1200 ** Improved documentation
1201 In particular, portability issues are better covered.
1204 All the standard GNU Makefile targets are supported. The layout has
1205 changed: m4/ holds the M4 extensions Autoconf needs for its
1206 configuration, doc/ contains the documentation, and tests/ contains
1209 ** Man pages are provided
1210 For autoconf, autoreconf, autoupdate, autoheader, autoscan, ifnames,
1211 config.guess, config.sub.
1215 Provides a safe and powerful means to trace the macro uses. This
1216 provide the parsing layer for tools which need to `study'
1220 Specify what category of warnings should be enabled.
1222 - When recursing into subdirectories, try for configure.gnu before
1223 configure to adapt for packages not using autoconf on case-insensitive
1227 More errors are now caught (circular AC_REQUIRE dependencies,
1228 AC_DEFINE in the action part of an AC_CACHE_CHECK, too many pops
1229 etc.). In addition, their location and call stack are given.
1232 autoupdate is much more powerful, and is able to provide the glue code
1233 which might be needed to move from an old macro to its newer
1236 You are strongly encouraged to use it to modernize both your
1237 `configure.in' and your .m4 extension files.
1240 The internal machinery of autoheader has completely changed. As a
1241 result, using `acconfig.h' should be considered to be obsoleted, and
1242 you are encouraged to get rid of it using the AH macros.
1247 ** Fortran 77 compilers
1248 Globally, the support for Fortran 77 is considerably improved.
1250 Support for automatically determining a Fortran 77 compiler's
1251 name-mangling scheme. New CPP macros F77_FUNC and F77_FUNC_ are
1252 provided to wrap C/C++ identifiers, thus making it easier and more
1253 transparent for C/C++ to call Fortran 77 routines, and Fortran 77 to
1254 call C/C++ routines. See the Texinfo documentation for details.
1257 The test suite no longer uses DejaGNU. It should be easy to submit
1258 test cases in this new framework.
1261 - --help, --help=long, -hl
1262 no longer dumps useless items.
1264 lists only specific options.
1265 - --help=recursive, -hr
1266 displays the help of all the embedded packages.
1267 - Remembers environment variables when reconfiguring.
1268 The previous scheme to set envvar before running configure was
1270 what prevented configure from remembering the environment in which
1271 it was run, therefore --recheck was run in an inconsistent
1272 environment. Now, one should run
1274 and then --recheck will work properly. Variables declared with
1275 AC_ARG_VAR are also preserved.
1277 $build defaults to `config.guess`, $host to $build, and then $target
1279 Cross-compilation is a global status of the package, it no longer
1280 depends upon the current language.
1281 Cross compilation is enabled iff the user specified `--host'.
1282 `configure' now fails if it can't run the executables it compiles,
1283 unless cross-compilation is enabled.
1285 The cache file is disabled by default. The new options
1286 `--config-cache', `-C' set the cache to `config.cache'.
1290 Much faster on most architectures.
1291 - concurrent executions
1292 It is safe to use `make -j' with config.status.
1293 - human interface improved
1294 It is possible to invoke
1295 ./config.status foobar
1296 instead of the former form (still valid)
1297 CONFIG_COMMANDS= CONFIG_HEADERS= CONFIG_LINKS= \
1298 CONFIG_FILES=foobar:foo.in:bar.in \
1300 The same holds for configuration headers and links.
1301 You can instantiate unknown files and headers:
1302 ./config.status --header foo.h:foo.h.in --file bar:baz
1303 - has a useful --help
1304 - accepts special file name "-" for stdin/stdout
1309 Specify additional copyright information.
1312 Now expects the identity of the package as argument.
1316 Most macros, if not all, now strictly follow the `one quotation
1317 level' rule. This results in a more predictable expansion.
1320 A sly bug in the AC_REQUIRE machinery, which could produce incorrect
1321 configure scripts, was fixed by Axel Thimm.
1325 Document and ask for the registration of an envvar.
1328 Specifies the file which `configure' should look for when trying to
1329 find the source tree (used to be handled by AC_INIT).
1331 - AC_CONFIG_COMMANDS
1332 To add new actions to config.status. Should be used instead of
1336 Replaces AC_LINK_FILES.
1338 - AC_CONFIG_HEADERS, AC_CONFIG_COMMANDS, AC_CONFIG_SUBDIRS,
1339 AC_CONFIG_LINKS, and AC_CONFIG_FILES
1340 They now obey sh: you should no longer use shell variables as
1341 argument. Instead of
1343 test "$package_foo_enabled" = yes && $my_subdirs="$my_subdirs foo"
1344 AC_CONFIG_SUBDIRS($my_subdirs)
1348 if test "$package_foo_enabled" = yes; then
1349 AC_CONFIG_SUBDIRS(foo)
1353 To format an Autoconf macro's help string so that it looks pretty
1354 when the user executes `configure --help'.
1357 ** Generic Test Macros
1359 The interface of the AC_CHECK families of macros (decl, header,
1360 type, member, func) is now uniform. They support the same set of
1363 - AC_CHECK_DECL, AC_CHECK_DECLS
1364 To check whether a symbol is declared.
1366 - AC_CHECK_SIZEOF, AC_C_CHAR_UNSIGNED.
1367 No longer need a cross-compilation default.
1370 The test it performs is much more robust than previously, and makes
1371 it possible to test builtin types in addition to typedefs.
1372 It is now schizophrenic:
1373 - AC_CHECK_TYPE(TYPE, REPLACEMENT)
1374 remains for backward compatibility, but its use is discouraged.
1375 - AC_CHECK_TYPE(TYPE, IF-FOUND, IF-NOT-FOUND, INCLUDES)
1376 behaves exactly like the other AC_CHECK macros.
1379 Checks whether given types are supported by the system.
1381 - AC_CHECK_MEMBER, AC_CHECK_MEMBERS
1382 Check for given members in aggregates (e.g., pw_gecos in struct
1386 Checks if the compiler supports ISO C, included when needs special
1390 Checking whether the preprocessor indicates missing includes by the
1391 error code. stderr is checked by AC_TRY_CPP only as a fallback.
1394 Takes a language as argument and replaces AC_LANG_C,
1395 AC_LANG_CPLUSPLUS and AC_LANG_FORTRAN77.
1397 - AC_LANG_PUSH, AC_LANG_POP
1398 Are preferred to AC_LANG_SAVE, AC_LANG_RESTORE.
1401 - AC_FUNC_CHOWN, AC_FUNC_MALLOC, AC_FUNC_STRERROR_R,
1402 AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK, AC_FUNC_STAT, AC_FUNC_LSTAT,
1403 AC_FUNC_ERROR_AT_LINE, AC_FUNC_OBSTACK, AC_FUNC_STRTOD, AC_FUNC_FSEEKO.
1407 Sets GETGROUPS_LIBS.
1409 - AC_FUNC_GETLOADAVG
1410 Defines `HAVE_STRUCT_NLIST_N_UN_N_NAME' instead of `NLIST_NAME_UNION'.
1413 Now integrates `AC_DECL_YYTEXT' which is obsoleted.
1416 Arrange for large-file support.
1418 - AC_EXEEXT, AC_OBJEXT
1419 You are no longer expected to use them: their computation is
1420 performed by default.
1422 ** C++ compatibility
1423 Every macro has been revisited in order to support at best CC=c++.
1425 Major changes in Autoconf 2.14:
1426 There was no release of GNU Autoconf 2.14.
1428 Major changes in Autoconf 2.13:
1430 Released 1999-05-01 by Ben Elliston.
1432 * Support for building on Win32 systems where the only available C or
1433 C++ compiler is the Microsoft Visual C++ command line compiler
1434 (`cl'). Additional support for building on Win32 systems which are
1435 using the Cygwin or Mingw32 environments.
1436 * Support for alternative object file and executable file extensions.
1437 On Win32, for example, these are .obj and .exe. These are discovered
1438 using AC_OBJEXT and AC_EXEEXT, which substitute @OBJEXT@ and
1439 @EXEEXT@ in the output, respectively.
1440 * New macros: AC_CACHE_LOAD, AC_CACHE_SAVE, AC_FUNC_SELECT_ARGTYPES,
1441 AC_VALIDATE_CACHED_SYSTEM_TUPLE, AC_SEARCH_LIBS, AC_TRY_LINK_FUNC,
1442 AC_C_STRINGIZE, AC_CHECK_FILE(S), AC_PROG_F77 (and friends).
1443 * AC_DEFINE now has an optional third argument for a description to be
1444 placed in the config header input file (e.g. config.h.in).
1445 * The C++ code fragment compiled for the C++ compiler test had to be
1446 improved to include an explicit return type for main(). This was
1447 causing failures on systems using recent versions of the EGCS C++
1449 * Fixed an important bug in AC_CHECK_TYPE that would cause a configure
1450 script to report that `sometype_t' was present when only `type_t'
1452 * Merge of the FSF version of config.guess and config.sub to modernize
1453 these scripts. Add support for a few new hosts in config.guess.
1454 Incorporate latest versions of install-sh, mkinstalldirs and
1455 texinfo.tex from the FSF.
1456 * autoreconf is capable of running automake if necessary (and
1458 * Support for Fortran 77. See the Texinfo documentation for details.
1459 * Bug fixes and workarounds for quirky bugs in vendor utilities.
1461 Major changes in Autoconf 2.12:
1463 Released 1996-11-26 by David J. MacKenzie
1465 * AC_OUTPUT and AC_CONFIG_HEADER can create output files by
1466 concatenating multiple input files separated by colons, like so:
1467 AC_CONFIG_HEADER(config.h:conf.pre:config.h.in:conf.post)
1468 AC_OUTPUT(Makefile:Makefile.in:Makefile.rules)
1469 The arguments may be shell variables, to compute the lists on the fly.
1470 * AC_LINK_FILES and AC_CONFIG_SUBDIRS may be called multiple times.
1471 * New macro AC_OUTPUT_COMMANDS adds more commands to run in config.status.
1474 Major changes in Autoconf 2.11:
1476 Released November 18th, 1996, by David J. MacKenzie
1478 * AC_PROG_CC and AC_PROG_CXX check whether the compiler works.
1479 They also default CFLAGS/CXXFLAGS to "-g -O2" for gcc, instead of "-g -O".
1480 * AC_REPLACE_FUNCS defines HAVE_foo if the system has the function `foo'.
1481 * AC_CONFIG_HEADER expands shell variables in its argument.
1482 * New macros: AC_FUNC_FNMATCH, AC_FUNC_SETPGRP.
1483 * The "checking..." messages and the source code for test programs that
1484 fail are saved in config.log.
1485 * Another workaround has been added for seds with small command length limits.
1486 * config.sub and config.guess recognize more system types.
1489 Major changes in Autoconf 2.10:
1491 Released May 7th, 1996, by Roland McGrath
1494 * The cache variable names used by `AC_CHECK_LIB(LIB, FUNC, ...)' has
1495 changed: now $ac_cv_lib_LIB_FUNC, previously $ac_cv_lib_LIB.
1497 Major changes in Autoconf 2.9:
1499 Released March 16th, 1996, by Roland McGrath
1503 Major changes in Autoconf 2.8:
1505 Released March 8th, 1996, by Roland McGrath
1509 Major changes in Autoconf 2.7:
1511 Released November 22nd, 1995, by David J. MacKenzie
1515 Major changes in Autoconf 2.6:
1517 Released November 20th, 1995, by David J. MacKenzie
1521 Major changes in Autoconf 2.5:
1523 Released November 17th, 1995, by Roland McGrath
1525 * New configure options --bindir, --libdir, --datadir, etc., with
1526 corresponding output variables.
1527 * New macro: AC_CACHE_CHECK, to make using the cache easier.
1528 * config.log contains the command being run as well as any output from it.
1529 * AC_CHECK_LIB can check for libraries with "." or "/" or "+" in their name.
1530 * AC_PROG_INSTALL doesn't cache a name for install-sh, for sharing caches.
1531 * AC_CHECK_PROG, AC_PATH_PROG, AC_CHECK_PROGS, AC_PATH_PROGS, and
1532 AC_CHECK_TOOL can search a path other than $PATH.
1533 * AC_CHECK_SIZEOF takes an optional size to use when cross-compiling.
1535 Major changes in Autoconf 2.4:
1537 Released June 14th, 1995, by David J. MacKenzie
1539 * Fix a few bugs found by Emacs testers.
1541 Major changes in Autoconf 2.3:
1543 Released March 27th, 1995, by David J. MacKenzie
1545 * Fix the cleanup trap in several ways.
1546 * Handle C compilers that are picky about option placement.
1547 * ifnames gets the version number from the right directory.
1549 Major changes in Autoconf 2.2:
1551 Released March 8th, 1995, by David J. MacKenzie
1553 * The ifnames utility is much faster but requires a "new awk" interpreter.
1554 * AC_CHECK_LIB and AC_HAVE_LIBRARY check and add the new
1555 library before existing libs, not after, in case it uses them.
1556 * New macros: AC_FUNC_GETPGRP, AC_CHECK_TOOL.
1557 * Lots of bug fixes.
1558 * Many additions to the TODO file :-)
1560 Major changes in Autoconf 2.1:
1562 Released November 4th, 1994, by David J. MacKenzie
1565 * More explanations in the manual.
1566 * Fix a spurious failure in the testsuite.
1567 * Clarify some warning messages.
1568 * autoreconf by default only rebuilds configure and config.h.in files
1569 that are older than any of their particular input files; there is a
1570 --force option to use after installing a new version of Autoconf.
1572 Thanks to everybody who's submitted changes and additions to Autoconf!
1573 I've incorporated many of them, and am still considering others for
1574 future releases -- but I didn't want to postpone this release indefinitely.
1576 Caution: don't indiscriminately rebuild configure scripts with
1577 Autoconf version 2. Some configure.in files need minor adjustments to
1578 work with it; the documentation has a chapter on upgrading. A few
1579 configure.in files, including those for GNU Emacs and the GNU C
1580 Library, need major changes because they relied on undocumented
1581 internals of version 1. Future releases of those packages will have
1582 updated configure.in files.
1584 It's best to use GNU M4 1.3 (or later) with Autoconf version 2.
1585 Autoconf now makes heavy use of M4 diversions, which were implemented
1586 inefficiently in GNU M4 releases before 1.3.
1588 Major changes in Autoconf 2.0:
1590 Released October 26th, 1994, by David J. MacKenzie
1592 ** New copyright terms:
1593 * There are no restrictions on distribution or use of configure scripts.
1596 * Autoconf manual is reorganized to make information easier to find
1597 and has several new indexes.
1598 * INSTALL is reorganized and clearer and is now made from Texinfo source.
1601 * autoscan to generate a preliminary configure.in for a package by
1602 scanning its source code for commonly used nonportable functions,
1603 programs, and header files.
1604 * ifnames to list the symbols used in #if and #ifdef directives in a
1606 * autoupdate to update a configure.in to use the version 2 macro names.
1607 * autoreconf to recursively remake configure and configuration header
1608 files in a source tree.
1610 ** Changed utilities:
1611 * autoheader can take pieces of acconfig.h to replace config.h.{top,bot}.
1612 * autoconf and autoheader can look for package-local definition files
1613 in an alternate directory.
1616 * AC_CACHE_VAL to share results of tests between configure runs.
1617 * AC_DEFUN to define macros, automatically AC_PROVIDE them, and ensure
1618 that macros invoked with AC_REQUIRE don't interrupt other macros.
1619 * AC_CONFIG_AUX_DIR, AC_CANONICAL_SYSTEM, AC_CANONICAL_HOST, AC_LINK_FILES to
1620 support deciding unguessable features based on the host and target types.
1621 * AC_CONFIG_SUBDIRS to recursively configure a source tree.
1622 * AC_ARG_PROGRAM to use the options --program-prefix,
1623 --program-suffix, and --program-transform-name to change the names
1624 of programs being installed.
1625 * AC_PREFIX_DEFAULT to change the default installation prefix.
1626 * AC_TRY_COMPILE to compile a test program without linking it.
1627 * AC_CHECK_TYPE to check whether sys/types.h or stdlib.h defines a given type.
1628 * AC_CHECK_LIB to check for a particular function and library.
1629 * AC_MSG_CHECKING and AC_MSG_RESULT to print test results, on a single line,
1630 whether or not the test succeeds. They obsolete AC_CHECKING and AC_VERBOSE.
1631 * AC_SUBST_FILE to insert one file into another.
1632 * AC_FUNC_MEMCMP to check whether memcmp is 8-bit clean.
1633 * AC_FUNC_STRFTIME to find strftime even if it's in -lintl.
1634 * AC_FUNC_GETMNTENT to find getmntent even if it's in -lsun or -lseq.
1635 * AC_HEADER_SYS_WAIT to check whether sys/wait.h is POSIX.1 compatible.
1638 * Many macros renamed systematically, but old names are accepted for
1639 backward compatibility.
1640 * AC_OUTPUT adds the "automatically generated" comment to
1641 non-Makefiles where it finds @configure_input@ in an input file, to
1642 support files with various comment syntaxes.
1643 * AC_OUTPUT does not replace "prefix" and "exec_prefix" in generated
1644 files when they are not enclosed in @ signs.
1645 * AC_OUTPUT allows the optional environment variable CONFIG_STATUS to
1646 override the file name "config.status".
1647 * AC_OUTPUT takes an optional argument for passing variables from
1648 configure to config.status.
1649 * AC_OUTPUT and AC_CONFIG_HEADER allow you to override the input-file names.
1650 * AC_OUTPUT automatically substitutes the values of CFLAGS, CXXFLAGS,
1651 CPPFLAGS, and LDFLAGS from the environment.
1652 * AC_PROG_CC and AC_PROG_CXX now set CFLAGS and CXXFLAGS, respectively.
1653 * AC_PROG_INSTALL looks for install-sh or install.sh in the directory
1654 specified by AC_CONFIG_AUXDIR, or srcdir or srcdir/.. or
1655 srcdir/../.. by default.
1656 * AC_DEFINE, AC_DEFINE_UNQUOTED, and AC_SUBST are more robust and smaller.
1657 * AC_DEFINE no longer prints anything, because of the new result reporting
1658 mechanism (AC_MSG_CHECKING and AC_MSG_RESULT).
1659 * AC_VERBOSE pays attention to --quiet/--silent, not --verbose.
1660 * AC_ARG_ENABLE and AC_ARG_WITH support whitespace in the arguments to
1661 --enable- and --with- options.
1662 * AC_CHECK_FUNCS and AC_CHECK_HEADERS take optional shell commands to
1663 execute on success or failure.
1664 * Checking for C functions in C++ works.
1667 * AC_REMOTE_TAPE and AC_RSH removed; too specific to tar and cpio, and
1668 better maintained with them.
1669 * AC_ARG_ARRAY removed because no one was likely using it.
1670 * AC_HAVE_POUNDBANG replaced with AC_SYS_INTERPRETER, which doesn't
1671 take arguments, for consistency with all of the other specific checks.
1674 * Comes with config.sub and config.guess, and uses them optionally.
1675 * Uses config.cache to cache test results. An alternate cache file
1676 can be selected with the --cache-file=FILE option.
1677 * Uses optional shell scripts $prefix/share/config.site and
1678 $prefix/etc/config.site to perform site or system specific initializations.
1679 * configure saves compiler output to ./config.log for debugging.
1680 * New files autoconf.m4 and autoheader.m4 load the other Autoconf macros.
1681 * acsite.m4 is the new name for the system-wide aclocal.m4.
1682 * Has a DejaGnu test suite.
1684 Major changes in Autoconf 1.11:
1686 * AC_PROG_INSTALL calls install.sh with the -c option.
1687 * AC_SET_MAKE cleans up after itself.
1688 * AC_OUTPUT sets prefix and exec_prefix if they weren't set already.
1689 * AC_OUTPUT prevents shells from looking in PATH for config.status.
1691 Plus a few other bug fixes.
1693 Major changes in Autoconf 1.10:
1695 * autoheader uses config.h.bot if present, analogous to config.h.top.
1696 * AC_PROG_INSTALL looks for install.sh in srcdir or srcdir/.. and
1698 * AC_PROG_CXX looks for cxx as a C++ compiler.
1700 Plus several bugs fixed.
1702 Major changes in Autoconf 1.9:
1704 * AC_YYTEXT_POINTER replaces AC_DECLARE_YYTEXT.
1705 * AC_SIZEOF_TYPE generates the cpp symbol name automatically,
1706 and autoheader generates entries for those names automatically.
1707 * AC_FIND_X gets the result from xmkmf correctly.
1708 * AC_FIND_X assumes no X if --without-x was given.
1709 * AC_FIND_XTRA adds libraries to the variable X_EXTRA_LIBS.
1710 * AC_PROG_INSTALL finds OSF/1 installbsd.
1712 Major changes in Autoconf 1.8:
1715 * New macros AC_LANG_C, AC_LANG_CPLUSPLUS, AC_LANG_SAVE, AC_LANG_RESTORE,
1716 AC_PROG_CXX, AC_PROG_CXXCPP, AC_REQUIRE_CPP
1717 for checking both C++ and C features in one configure script.
1718 * New macros AC_CHECKING, AC_VERBOSE, AC_WARN, AC_ERROR for printing messages.
1719 * New macros AC_FIND_XTRA, AC_MMAP, AC_SIZEOF_TYPE, AC_PREREQ,
1720 AC_SET_MAKE, AC_ENABLE.
1723 * AC_FIND_X looks for X in more places.
1724 * AC_PROG_INSTALL defaults to install.sh instead of cp, if it's in srcdir.
1725 install.sh is distributed with Autoconf.
1726 * AC_DECLARE_YYTEXT has been removed because it can't work, pending
1727 a rewrite of quoting in AC_DEFINE.
1728 * AC_OUTPUT adds its comments in C format when substituting in C files.
1729 * AC_COMPILE_CHECK protects its ECHO-TEXT argument with double quotes.
1731 ** New or changed command line options:
1732 * configure accepts --enable-FEATURE[=ARG] and --disable-FEATURE options.
1733 * configure accepts --without-PACKAGE, which sets withval=no.
1734 * configure accepts --x-includes=DIR and --x-libraries=DIR.
1735 * Giving --with-PACKAGE no argument sets withval=yes instead of withval=1.
1736 * configure accepts --help, --version, --silent/--quiet, --no-create options.
1737 * configure accepts and ignores most other Cygnus configure options, and
1738 warns about unknown options.
1739 * config.status accepts --help, --version options.
1741 ** File names and other changes:
1742 * Relative srcdir values are not made absolute.
1743 * The values of @prefix@ and @exec_prefix@ and @top_srcdir@ get substituted.
1744 * Autoconf library files are installed in ${datadir}/autoconf, not ${datadir}.
1745 * autoheader optionally copies config.h.top to the beginning of config.h.in.
1746 * The example Makefile dependencies for configure et al. work better.
1747 * Namespace cleanup: all shell variables used internally by Autoconf
1748 have names beginning with `ac_'.
1750 More big improvements are in process for future releases, but have not
1751 yet been (variously) finished, integrated, tested, or documented enough
1754 Major changes in Autoconf 1.7:
1756 * New macro AC_OBSOLETE.
1757 * Bugs in Makefile.in fixed.
1758 * AC_LONG_FILE_NAMES improved.
1760 Major changes in Autoconf 1.6:
1762 * New macro AC_LONG_64_BITS.
1763 * Multiple .h files can be created.
1764 * AC_FIND_X looks for X files directly if it doesn't find xmkmf.
1765 * AC_ALLOCA defines C_ALLOCA if using alloca.c.
1766 * --with-NAME can take a value, e.g., --with-targets=sun4,hp300bsd.
1767 * Unused --no-create option to configure removed.
1768 * autoheader doesn't change the timestamp of its output file if
1769 the file didn't change.
1770 * All macros that look for libraries now use AC_HAVE_LIBRARY.
1771 * config.status checks three optional environment variables to
1772 modify its behavior.
1773 * The usual bug fixes.
1775 Major changes in Autoconf 1.5:
1777 * New macros AC_FIND_X, AC_OFF_T, AC_STAT_MACROS_BROKEN, AC_REVISION.
1778 * autoconf and autoheader scripts have GNU standards conforming
1779 --version and --help options (they print their message and exit).
1782 Major changes in Autoconf 1.4:
1784 * New macros AC_HAVE_POUNDBANG, AC_TIME_WITH_SYS_TIME, AC_LONG_DOUBLE,
1785 AC_GETGROUPS_T, AC_DEFINE_UNQUOTED.
1786 * autoconf and autoheader use the M4 environment variable to determine the
1787 name of the M4 program to use.
1788 * The --macrodir option to autoconf and autoheader specifies the directory
1789 in which acspecific.m4, acgeneral.m4, etc. reside if not the default.
1790 * autoconf and autoheader can take `-' as their file names, which means to
1791 read stdin as input.
1792 * Resulting configure scripts can take a --verbose option which causes them
1793 to print the results of their tests.
1794 * AC_DEFINE quotes its second argument in such a way that spaces, magic
1795 shell characters, etc. will be preserved during various stages of
1796 expansion done by the shell. If you don't want this, use
1797 AC_DEFINE_UNQUOTED instead.
1798 * Much textual processing done with external calls to tr and sed have been
1799 internalized with builtin M4 `patsubst' and `translit' calls.
1800 * AC_OUTPUT doesn't hardwire the file names it outputs. Instead, you can
1801 set the shell variables `gen_files' and `gen_config' to the list of
1802 file names to output.
1803 * AC_DECLARE_YYTEXT does an AC_SUBST of `LEX_OUTPUT_ROOT', which may be
1804 "lex.yy" or "lexyy", depending on the system.
1805 * AC_PROGRAMS_CHECK takes an optional third arg. If given, it is used as
1807 * If AC_ALLOCA chooses alloca.c, it also defines STACK_DIRECTION.
1808 * AC_CONST works much more reliably on more systems.
1811 Major changes in Autoconf 1.3:
1813 configure no longer requires awk for packages that use a config.h.
1814 Support handling --with-PACKAGE options.
1815 New `autoheader' script to create `config.h.in' from `configure.in'.
1816 Ignore troublesome -lucb and -lPW when searching for alloca.
1817 Rename --exec_prefix to --exec-prefix for GNU standards conformance.
1818 Improve detection of STDC library.
1819 Add AC_HAVE_LIBRARY to check for non-default libraries.
1820 Function checking should work with future GNU libc releases.
1822 Major changes in Autoconf 1.2:
1824 The --srcdir option is now usually unnecessary.
1825 Add a file containing sample comments describing CPP macros.
1826 A comment in config.status tells which host it was configured on.
1827 Substituted variable values can now contain commas.
1828 Fix bugs in various feature checks.
1830 Major changes in Autoconf 1.1:
1832 Added AC_STRCOLL macro.
1833 Made AC_GETLOADAVG check for more things.
1834 AC_OUTPUT argument is now optional.
1839 Copyright (C) 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002,
1840 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
1842 This program is free software: you can redistribute it and/or modify
1843 it under the terms of the GNU General Public License as published by
1844 the Free Software Foundation, either version 3 of the License, or
1845 (at your option) any later version.
1847 This program is distributed in the hope that it will be useful,
1848 but WITHOUT ANY WARRANTY; without even the implied warranty of
1849 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1850 GNU General Public License for more details.
1852 You should have received a copy of the GNU General Public License
1853 along with this program. If not, see <http://www.gnu.org/licenses/>.