1 # gnulib-common.m4 serial 39
2 dnl Copyright (C) 2007-2018 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
8 # is expanded unconditionally through gnulib-tool magic.
9 AC_DEFUN([gl_COMMON], [
10 dnl Use AC_REQUIRE here, so that the code is expanded once only.
11 AC_REQUIRE([gl_00GNULIB])
12 AC_REQUIRE([gl_COMMON_BODY])
14 AC_DEFUN([gl_COMMON_BODY], [
15 AH_VERBATIM([_Noreturn],
16 [/* The _Noreturn keyword of C11. */
17 #if ! (defined _Noreturn \
18 || (defined __STDC_VERSION__ && 201112 <= __STDC_VERSION__))
19 # if (3 <= __GNUC__ || (__GNUC__ == 2 && 8 <= __GNUC_MINOR__) \
20 || 0x5110 <= __SUNPRO_C)
21 # define _Noreturn __attribute__ ((__noreturn__))
22 # elif defined _MSC_VER && 1200 <= _MSC_VER
23 # define _Noreturn __declspec (noreturn)
29 AH_VERBATIM([isoc99_inline],
30 [/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports
31 the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of
32 earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.
33 __APPLE__ && __MACH__ test for Mac OS X.
34 __APPLE_CC__ tests for the Apple compiler and its version.
35 __STDC_VERSION__ tests for the C99 mode. */
36 #if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
37 # define __GNUC_STDC_INLINE__ 1
39 AH_VERBATIM([unused_parameter],
40 [/* Define as a marker that can be attached to declarations that might not
41 be used. This helps to reduce warnings, such as from
42 GCC -Wunused-parameter. */
43 #if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
44 # define _GL_UNUSED __attribute__ ((__unused__))
48 /* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name
49 is a misnomer outside of parameter lists. */
50 #define _UNUSED_PARAMETER_ _GL_UNUSED
52 /* gcc supports the "unused" attribute on possibly unused labels, and
53 g++ has since version 4.5. Note to support C++ as well as C,
54 _GL_UNUSED_LABEL should be used with a trailing ; */
55 #if !defined __cplusplus || __GNUC__ > 4 \
56 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
57 # define _GL_UNUSED_LABEL _GL_UNUSED
59 # define _GL_UNUSED_LABEL
62 /* The __pure__ attribute was added in gcc 2.96. */
63 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
64 # define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
66 # define _GL_ATTRIBUTE_PURE /* empty */
69 /* The __const__ attribute was added in gcc 2.95. */
70 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
71 # define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
73 # define _GL_ATTRIBUTE_CONST /* empty */
76 /* The __malloc__ attribute was added in gcc 3. */
78 # define _GL_ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
80 # define _GL_ATTRIBUTE_MALLOC /* empty */
83 dnl Preparation for running test programs:
84 dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not
85 dnl to /dev/tty, so they can be redirected to log files. Such diagnostics
86 dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.
88 export LIBC_FATAL_STDERR_
91 # gl_MODULE_INDICATOR_CONDITION
92 # expands to a C preprocessor expression that evaluates to 1 or 0, depending
93 # whether a gnulib module that has been requested shall be considered present
95 m4_define([gl_MODULE_INDICATOR_CONDITION], [1])
97 # gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
98 # sets the shell variable that indicates the presence of the given module to
99 # a C preprocessor expression that will evaluate to 1.
100 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
102 gl_MODULE_INDICATOR_SET_VARIABLE_AUX(
103 [GNULIB_[]m4_translit([[$1]],
104 [abcdefghijklmnopqrstuvwxyz./-],
105 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
106 [gl_MODULE_INDICATOR_CONDITION])
109 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable])
110 # modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION.
111 # The shell variable's value is a C preprocessor expression that evaluates
113 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX],
115 m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1],
117 dnl Simplify the expression VALUE || 1 to 1.
120 [gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1],
121 [gl_MODULE_INDICATOR_CONDITION])])
124 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition])
125 # modifies the shell variable to include the given condition. The shell
126 # variable's value is a C preprocessor expression that evaluates to 0 or 1.
127 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR],
129 dnl Simplify the expression 1 || CONDITION to 1.
130 if test "$[]$1" != 1; then
131 dnl Simplify the expression 0 || CONDITION to CONDITION.
132 if test "$[]$1" = 0; then
140 # gl_MODULE_INDICATOR([modulename])
141 # defines a C macro indicating the presence of the given module
142 # in a location where it can be used.
144 # | in lib/ | in tests/ |
145 # --------------------------------------------+---------+-----------+
146 # Module present among main modules: | 1 | 1 |
147 # --------------------------------------------+---------+-----------+
148 # Module present among tests-related modules: | 0 | 1 |
149 # --------------------------------------------+---------+-----------+
150 # Module not present at all: | 0 | 0 |
151 # --------------------------------------------+---------+-----------+
152 AC_DEFUN([gl_MODULE_INDICATOR],
154 AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],
155 [abcdefghijklmnopqrstuvwxyz./-],
156 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),
157 [gl_MODULE_INDICATOR_CONDITION],
158 [Define to a C preprocessor expression that evaluates to 1 or 0,
159 depending whether the gnulib module $1 shall be considered present.])
162 # gl_MODULE_INDICATOR_FOR_TESTS([modulename])
163 # defines a C macro indicating the presence of the given module
164 # in lib or tests. This is useful to determine whether the module
167 # | in lib/ | in tests/ |
168 # --------------------------------------------+---------+-----------+
169 # Module present among main modules: | 1 | 1 |
170 # --------------------------------------------+---------+-----------+
171 # Module present among tests-related modules: | 1 | 1 |
172 # --------------------------------------------+---------+-----------+
173 # Module not present at all: | 0 | 0 |
174 # --------------------------------------------+---------+-----------+
175 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],
177 AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],
178 [abcdefghijklmnopqrstuvwxyz./-],
179 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
180 [Define to 1 when the gnulib module $1 should be tested.])
183 # gl_ASSERT_NO_GNULIB_POSIXCHECK
184 # asserts that there will never be a need to #define GNULIB_POSIXCHECK.
185 # and thereby enables an optimization of configure and config.h.
187 AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
189 dnl Override gl_WARN_ON_USE_PREPARE.
190 dnl But hide this definition from 'aclocal'.
191 AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], [])
194 # gl_ASSERT_NO_GNULIB_TESTS
195 # asserts that there will be no gnulib tests in the scope of the configure.ac
196 # and thereby enables an optimization of config.h.
198 AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
200 dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
201 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
204 # Test whether <features.h> exists.
205 # Set HAVE_FEATURES_H.
206 AC_DEFUN([gl_FEATURES_H],
208 AC_CHECK_HEADERS_ONCE([features.h])
209 if test $ac_cv_header_features_h = yes; then
214 AC_SUBST([HAVE_FEATURES_H])
218 # is a backport of autoconf-2.59c's m4_foreach_w.
219 # Remove this macro when we can assume autoconf >= 2.60.
220 m4_ifndef([m4_foreach_w],
221 [m4_define([m4_foreach_w],
222 [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
224 # AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])
225 # ----------------------------------------------------
226 # Backport of autoconf-2.63b's macro.
227 # Remove this macro when we can assume autoconf >= 2.64.
228 m4_ifndef([AS_VAR_IF],
229 [m4_define([AS_VAR_IF],
230 [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
233 # Modifies the value of the shell variable CC in an attempt to make $CC
234 # understand ISO C99 source code.
235 # This is like AC_PROG_CC_C99, except that
236 # - AC_PROG_CC_C99 did not exist in Autoconf versions < 2.60,
237 # - AC_PROG_CC_C99 does not mix well with AC_PROG_CC_STDC
238 # <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00367.html>,
239 # but many more packages use AC_PROG_CC_STDC than AC_PROG_CC_C99
240 # <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00441.html>.
241 # Remaining problems:
242 # - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options
244 # <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00431.html>.
245 # - AC_PROG_CC_STDC is likely to change now that C11 is an ISO standard.
246 AC_DEFUN([gl_PROG_CC_C99],
248 dnl Change that version number to the minimum Autoconf version that supports
249 dnl mixing AC_PROG_CC_C99 calls with AC_PROG_CC_STDC calls.
250 m4_version_prereq([9.0],
251 [AC_REQUIRE([AC_PROG_CC_C99])],
252 [AC_REQUIRE([AC_PROG_CC_STDC])])
256 # Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler.
257 # The user can set the variables AR, ARFLAGS, RANLIB if he wants to override
259 AC_DEFUN([gl_PROG_AR_RANLIB],
261 dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler
262 dnl as "cc", and GCC as "gcc". They have different object file formats and
263 dnl library formats. In particular, the GNU binutils programs ar and ranlib
264 dnl produce libraries that work only with gcc, not with cc.
265 AC_REQUIRE([AC_PROG_CC])
266 dnl The '][' hides this use from 'aclocal'.
267 AC_BEFORE([$0], [A][M_PROG_AR])
268 AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler],
270 AC_EGREP_CPP([Amsterdam],
276 [gl_cv_c_amsterdam_compiler=yes],
277 [gl_cv_c_amsterdam_compiler=no])
280 dnl Don't compete with AM_PROG_AR's decision about AR/ARFLAGS if we are not
281 dnl building with __ACK__.
282 if test $gl_cv_c_amsterdam_compiler = yes; then
283 if test -z "$AR"; then
286 if test -z "$ARFLAGS"; then
290 dnl AM_PROG_AR was added in automake v1.11.2. AM_PROG_AR does not AC_SUBST
291 dnl ARFLAGS variable (it is filed into Makefile.in directly by automake
292 dnl script on-demand, if not specified by ./configure of course).
293 dnl Don't AC_REQUIRE the AM_PROG_AR otherwise the code for __ACK__ above
294 dnl will be ignored. Also, pay attention to call AM_PROG_AR in else block
295 dnl because AM_PROG_AR is written so it could re-set AR variable even for
296 dnl __ACK__. It may seem like its easier to avoid calling the macro here,
297 dnl but we need to AC_SUBST both AR/ARFLAGS (thus those must have some good
298 dnl default value and automake should usually know them).
300 dnl The '][' hides this use from 'aclocal'.
301 m4_ifdef([A][M_PROG_AR], [A][M_PROG_AR], [:])
304 dnl In case the code above has not helped with setting AR/ARFLAGS, use
305 dnl Automake-documented default values for AR and ARFLAGS, but prefer
306 dnl ${host}-ar over ar (useful for cross-compiling).
307 AC_CHECK_TOOL([AR], [ar], [ar])
308 if test -z "$ARFLAGS"; then
314 if test -z "$RANLIB"; then
315 if test $gl_cv_c_amsterdam_compiler = yes; then
318 dnl Use the ranlib program if it is available.
326 # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix
327 # for interoperability with automake-1.9.6 from autoconf-2.62.
328 # Remove this macro when we can assume autoconf >= 2.62 or
329 # autoconf >= 2.60 && automake >= 1.10.
330 # AC_AUTOCONF_VERSION was introduced in 2.62, so use that as the witness.
331 m4_ifndef([AC_AUTOCONF_VERSION],[
332 m4_ifdef([AC_PROG_MKDIR_P], [
333 dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed.
334 m4_define([AC_PROG_MKDIR_P],
335 m4_defn([AC_PROG_MKDIR_P])[
336 AC_SUBST([MKDIR_P])])], [
337 dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P.
338 AC_DEFUN_ONCE([AC_PROG_MKDIR_P],
339 [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
341 AC_SUBST([MKDIR_P])])])
345 # This definition is copied from post-2.69 Autoconf and overrides the
346 # AC_C_RESTRICT macro from autoconf 2.60..2.69. It can be removed
347 # once autoconf >= 2.70 can be assumed. It's painful to check version
348 # numbers, and in practice this macro is more up-to-date than Autoconf
349 # is, so override Autoconf unconditionally.
350 AC_DEFUN([AC_C_RESTRICT],
351 [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
353 # The order here caters to the fact that C++ does not require restrict.
354 for ac_kw in __restrict __restrict__ _Restrict restrict; do
357 [[typedef int *int_ptr;
358 int foo (int_ptr $ac_kw ip) { return ip[0]; }
359 int bar (int [$ac_kw]); /* Catch GCC bug 14050. */
360 int bar (int ip[$ac_kw]) { return ip[0]; }
365 return foo (t) + bar (t);
367 [ac_cv_c_restrict=$ac_kw])
368 test "$ac_cv_c_restrict" != no && break
371 AH_VERBATIM([restrict],
372 [/* Define to the equivalent of the C99 'restrict' keyword, or to
373 nothing if this is not supported. Do not define if restrict is
374 supported directly. */
376 /* Work around a bug in Sun C++: it does not support _Restrict or
377 __restrict__, even though the corresponding Sun C compiler ends up with
378 "#define restrict _Restrict" or "#define restrict __restrict__" in the
379 previous line. Perhaps some future version of Sun C++ will work with
380 restrict; if so, hopefully it defines __RESTRICT like Sun C does. */
381 #if defined __SUNPRO_CC && !defined __RESTRICT
383 # define __restrict__
385 case $ac_cv_c_restrict in
387 no) AC_DEFINE([restrict], []) ;;
388 *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
393 # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
394 # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
395 # macros invoke AC_C_BIGENDIAN with arguments.
396 AC_DEFUN([gl_BIGENDIAN],
401 # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
402 # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
403 # output a spurious "(cached)" mark in the midst of other configure output.
404 # This macro should be used instead of AC_CACHE_VAL when it is not surrounded
405 # by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
406 AC_DEFUN([gl_CACHE_VAL_SILENT],
408 saved_as_echo_n="$as_echo_n"
410 AC_CACHE_VAL([$1], [$2])
411 as_echo_n="$saved_as_echo_n"
414 # AS_VAR_COPY was added in autoconf 2.63b
415 m4_define_default([AS_VAR_COPY],
416 [AS_LITERAL_IF([$1[]$2], [$1=$$2], [eval $1=\$$2])])
418 # AC_PROG_SED was added in autoconf 2.59b
419 m4_ifndef([AC_PROG_SED],
420 [AC_DEFUN([AC_PROG_SED],
421 [AC_CACHE_CHECK([for a sed that does not truncate output], ac_cv_path_SED,
422 [dnl ac_script should not contain more than 99 commands (for HP-UX sed),
423 dnl but more than about 7000 bytes, to catch a limit in Solaris 8 /usr/ucb/sed.
424 ac_script=s/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb/
425 for ac_i in 1 2 3 4 5 6 7; do
426 ac_script="$ac_script$as_nl$ac_script"
428 echo "$ac_script" 2>/dev/null | sed 99q >conftest.sed
429 AS_UNSET([ac_script])
430 if test -z "$SED"; then
431 ac_path_SED_found=false
433 for ac_prog in sed gsed; do
434 for ac_exec_ext in '' $ac_executable_extensions; do
435 ac_path_SED="$as_dir/$ac_prog$ac_exec_ext"
436 AS_EXECUTABLE_P(["$ac_path_SED"]) || continue
437 case `"$ac_path_SED" --version 2>&1` in
438 *GNU*) ac_cv_path_SED=$ac_path_SED ac_path_SED_found=:;;
441 _AS_ECHO_N([0123456789]) >conftest.in
444 cat conftest.in conftest.in >conftest.tmp
445 mv conftest.tmp conftest.in
446 cp conftest.in conftest.nl
448 "$ac_path_SED" -f conftest.sed <conftest.nl >conftest.out 2>/dev/null || break
449 diff conftest.out conftest.nl >/dev/null 2>&1 || break
450 ac_count=`expr $ac_count + 1`
451 if test $ac_count -gt ${ac_path_SED_max-0}; then
452 # Best so far, but keep looking for better
453 ac_cv_path_SED=$ac_path_SED
454 ac_path_SED_max=$ac_count
456 test $ac_count -gt 10 && break
458 rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
460 $ac_path_SED_found && break 3
463 if test -z "$ac_cv_path_SED"; then
464 AC_ERROR([no acceptable sed could be found in \$PATH])
470 SED="$ac_cv_path_SED"