1 # gnulib-common.m4 serial 38
2 dnl Copyright (C) 2007-2017 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 dnl Preparation for running test programs:
77 dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not
78 dnl to /dev/tty, so they can be redirected to log files. Such diagnostics
79 dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.
81 export LIBC_FATAL_STDERR_
84 # gl_MODULE_INDICATOR_CONDITION
85 # expands to a C preprocessor expression that evaluates to 1 or 0, depending
86 # whether a gnulib module that has been requested shall be considered present
88 m4_define([gl_MODULE_INDICATOR_CONDITION], [1])
90 # gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
91 # sets the shell variable that indicates the presence of the given module to
92 # a C preprocessor expression that will evaluate to 1.
93 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
95 gl_MODULE_INDICATOR_SET_VARIABLE_AUX(
96 [GNULIB_[]m4_translit([[$1]],
97 [abcdefghijklmnopqrstuvwxyz./-],
98 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
99 [gl_MODULE_INDICATOR_CONDITION])
102 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable])
103 # modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION.
104 # The shell variable's value is a C preprocessor expression that evaluates
106 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX],
108 m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1],
110 dnl Simplify the expression VALUE || 1 to 1.
113 [gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1],
114 [gl_MODULE_INDICATOR_CONDITION])])
117 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition])
118 # modifies the shell variable to include the given condition. The shell
119 # variable's value is a C preprocessor expression that evaluates to 0 or 1.
120 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR],
122 dnl Simplify the expression 1 || CONDITION to 1.
123 if test "$[]$1" != 1; then
124 dnl Simplify the expression 0 || CONDITION to CONDITION.
125 if test "$[]$1" = 0; then
133 # gl_MODULE_INDICATOR([modulename])
134 # defines a C macro indicating the presence of the given module
135 # in a location where it can be used.
137 # | in lib/ | in tests/ |
138 # --------------------------------------------+---------+-----------+
139 # Module present among main modules: | 1 | 1 |
140 # --------------------------------------------+---------+-----------+
141 # Module present among tests-related modules: | 0 | 1 |
142 # --------------------------------------------+---------+-----------+
143 # Module not present at all: | 0 | 0 |
144 # --------------------------------------------+---------+-----------+
145 AC_DEFUN([gl_MODULE_INDICATOR],
147 AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],
148 [abcdefghijklmnopqrstuvwxyz./-],
149 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),
150 [gl_MODULE_INDICATOR_CONDITION],
151 [Define to a C preprocessor expression that evaluates to 1 or 0,
152 depending whether the gnulib module $1 shall be considered present.])
155 # gl_MODULE_INDICATOR_FOR_TESTS([modulename])
156 # defines a C macro indicating the presence of the given module
157 # in lib or tests. This is useful to determine whether the module
160 # | in lib/ | in tests/ |
161 # --------------------------------------------+---------+-----------+
162 # Module present among main modules: | 1 | 1 |
163 # --------------------------------------------+---------+-----------+
164 # Module present among tests-related modules: | 1 | 1 |
165 # --------------------------------------------+---------+-----------+
166 # Module not present at all: | 0 | 0 |
167 # --------------------------------------------+---------+-----------+
168 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],
170 AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],
171 [abcdefghijklmnopqrstuvwxyz./-],
172 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
173 [Define to 1 when the gnulib module $1 should be tested.])
176 # gl_ASSERT_NO_GNULIB_POSIXCHECK
177 # asserts that there will never be a need to #define GNULIB_POSIXCHECK.
178 # and thereby enables an optimization of configure and config.h.
180 AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
182 dnl Override gl_WARN_ON_USE_PREPARE.
183 dnl But hide this definition from 'aclocal'.
184 AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], [])
187 # gl_ASSERT_NO_GNULIB_TESTS
188 # asserts that there will be no gnulib tests in the scope of the configure.ac
189 # and thereby enables an optimization of config.h.
191 AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
193 dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
194 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
197 # Test whether <features.h> exists.
198 # Set HAVE_FEATURES_H.
199 AC_DEFUN([gl_FEATURES_H],
201 AC_CHECK_HEADERS_ONCE([features.h])
202 if test $ac_cv_header_features_h = yes; then
207 AC_SUBST([HAVE_FEATURES_H])
211 # is a backport of autoconf-2.59c's m4_foreach_w.
212 # Remove this macro when we can assume autoconf >= 2.60.
213 m4_ifndef([m4_foreach_w],
214 [m4_define([m4_foreach_w],
215 [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
217 # AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])
218 # ----------------------------------------------------
219 # Backport of autoconf-2.63b's macro.
220 # Remove this macro when we can assume autoconf >= 2.64.
221 m4_ifndef([AS_VAR_IF],
222 [m4_define([AS_VAR_IF],
223 [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
226 # Modifies the value of the shell variable CC in an attempt to make $CC
227 # understand ISO C99 source code.
228 # This is like AC_PROG_CC_C99, except that
229 # - AC_PROG_CC_C99 did not exist in Autoconf versions < 2.60,
230 # - AC_PROG_CC_C99 does not mix well with AC_PROG_CC_STDC
231 # <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00367.html>,
232 # but many more packages use AC_PROG_CC_STDC than AC_PROG_CC_C99
233 # <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00441.html>.
234 # Remaining problems:
235 # - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options
237 # <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00431.html>.
238 # - AC_PROG_CC_STDC is likely to change now that C11 is an ISO standard.
239 AC_DEFUN([gl_PROG_CC_C99],
241 dnl Change that version number to the minimum Autoconf version that supports
242 dnl mixing AC_PROG_CC_C99 calls with AC_PROG_CC_STDC calls.
243 m4_version_prereq([9.0],
244 [AC_REQUIRE([AC_PROG_CC_C99])],
245 [AC_REQUIRE([AC_PROG_CC_STDC])])
249 # Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler.
250 # The user can set the variables AR, ARFLAGS, RANLIB if he wants to override
252 AC_DEFUN([gl_PROG_AR_RANLIB],
254 dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler
255 dnl as "cc", and GCC as "gcc". They have different object file formats and
256 dnl library formats. In particular, the GNU binutils programs ar and ranlib
257 dnl produce libraries that work only with gcc, not with cc.
258 AC_REQUIRE([AC_PROG_CC])
259 dnl The '][' hides this use from 'aclocal'.
260 AC_BEFORE([$0], [A][M_PROG_AR])
261 AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler],
263 AC_EGREP_CPP([Amsterdam],
269 [gl_cv_c_amsterdam_compiler=yes],
270 [gl_cv_c_amsterdam_compiler=no])
273 dnl Don't compete with AM_PROG_AR's decision about AR/ARFLAGS if we are not
274 dnl building with __ACK__.
275 if test $gl_cv_c_amsterdam_compiler = yes; then
276 if test -z "$AR"; then
279 if test -z "$ARFLAGS"; then
283 dnl AM_PROG_AR was added in automake v1.11.2. AM_PROG_AR does not AC_SUBST
284 dnl ARFLAGS variable (it is filed into Makefile.in directly by automake
285 dnl script on-demand, if not specified by ./configure of course).
286 dnl Don't AC_REQUIRE the AM_PROG_AR otherwise the code for __ACK__ above
287 dnl will be ignored. Also, pay attention to call AM_PROG_AR in else block
288 dnl because AM_PROG_AR is written so it could re-set AR variable even for
289 dnl __ACK__. It may seem like its easier to avoid calling the macro here,
290 dnl but we need to AC_SUBST both AR/ARFLAGS (thus those must have some good
291 dnl default value and automake should usually know them).
293 dnl The '][' hides this use from 'aclocal'.
294 m4_ifdef([A][M_PROG_AR], [A][M_PROG_AR], [:])
297 dnl In case the code above has not helped with setting AR/ARFLAGS, use
298 dnl Automake-documented default values for AR and ARFLAGS, but prefer
299 dnl ${host}-ar over ar (useful for cross-compiling).
300 AC_CHECK_TOOL([AR], [ar], [ar])
301 if test -z "$ARFLAGS"; then
307 if test -z "$RANLIB"; then
308 if test $gl_cv_c_amsterdam_compiler = yes; then
311 dnl Use the ranlib program if it is available.
319 # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix
320 # for interoperability with automake-1.9.6 from autoconf-2.62.
321 # Remove this macro when we can assume autoconf >= 2.62 or
322 # autoconf >= 2.60 && automake >= 1.10.
323 # AC_AUTOCONF_VERSION was introduced in 2.62, so use that as the witness.
324 m4_ifndef([AC_AUTOCONF_VERSION],[
325 m4_ifdef([AC_PROG_MKDIR_P], [
326 dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed.
327 m4_define([AC_PROG_MKDIR_P],
328 m4_defn([AC_PROG_MKDIR_P])[
329 AC_SUBST([MKDIR_P])])], [
330 dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P.
331 AC_DEFUN_ONCE([AC_PROG_MKDIR_P],
332 [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
334 AC_SUBST([MKDIR_P])])])
338 # This definition is copied from post-2.69 Autoconf and overrides the
339 # AC_C_RESTRICT macro from autoconf 2.60..2.69. It can be removed
340 # once autoconf >= 2.70 can be assumed. It's painful to check version
341 # numbers, and in practice this macro is more up-to-date than Autoconf
342 # is, so override Autoconf unconditionally.
343 AC_DEFUN([AC_C_RESTRICT],
344 [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
346 # The order here caters to the fact that C++ does not require restrict.
347 for ac_kw in __restrict __restrict__ _Restrict restrict; do
350 [[typedef int *int_ptr;
351 int foo (int_ptr $ac_kw ip) { return ip[0]; }
352 int bar (int [$ac_kw]); /* Catch GCC bug 14050. */
353 int bar (int ip[$ac_kw]) { return ip[0]; }
358 return foo (t) + bar (t);
360 [ac_cv_c_restrict=$ac_kw])
361 test "$ac_cv_c_restrict" != no && break
364 AH_VERBATIM([restrict],
365 [/* Define to the equivalent of the C99 'restrict' keyword, or to
366 nothing if this is not supported. Do not define if restrict is
367 supported directly. */
369 /* Work around a bug in Sun C++: it does not support _Restrict or
370 __restrict__, even though the corresponding Sun C compiler ends up with
371 "#define restrict _Restrict" or "#define restrict __restrict__" in the
372 previous line. Perhaps some future version of Sun C++ will work with
373 restrict; if so, hopefully it defines __RESTRICT like Sun C does. */
374 #if defined __SUNPRO_CC && !defined __RESTRICT
376 # define __restrict__
378 case $ac_cv_c_restrict in
380 no) AC_DEFINE([restrict], []) ;;
381 *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
386 # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
387 # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
388 # macros invoke AC_C_BIGENDIAN with arguments.
389 AC_DEFUN([gl_BIGENDIAN],
394 # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
395 # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
396 # output a spurious "(cached)" mark in the midst of other configure output.
397 # This macro should be used instead of AC_CACHE_VAL when it is not surrounded
398 # by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
399 AC_DEFUN([gl_CACHE_VAL_SILENT],
401 saved_as_echo_n="$as_echo_n"
403 AC_CACHE_VAL([$1], [$2])
404 as_echo_n="$saved_as_echo_n"
407 # AS_VAR_COPY was added in autoconf 2.63b
408 m4_define_default([AS_VAR_COPY],
409 [AS_LITERAL_IF([$1[]$2], [$1=$$2], [eval $1=\$$2])])
411 # AC_PROG_SED was added in autoconf 2.59b
412 m4_ifndef([AC_PROG_SED],
413 [AC_DEFUN([AC_PROG_SED],
414 [AC_CACHE_CHECK([for a sed that does not truncate output], ac_cv_path_SED,
415 [dnl ac_script should not contain more than 99 commands (for HP-UX sed),
416 dnl but more than about 7000 bytes, to catch a limit in Solaris 8 /usr/ucb/sed.
417 ac_script=s/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb/
418 for ac_i in 1 2 3 4 5 6 7; do
419 ac_script="$ac_script$as_nl$ac_script"
421 echo "$ac_script" 2>/dev/null | sed 99q >conftest.sed
422 AS_UNSET([ac_script])
423 if test -z "$SED"; then
424 ac_path_SED_found=false
426 for ac_prog in sed gsed; do
427 for ac_exec_ext in '' $ac_executable_extensions; do
428 ac_path_SED="$as_dir/$ac_prog$ac_exec_ext"
429 AS_EXECUTABLE_P(["$ac_path_SED"]) || continue
430 case `"$ac_path_SED" --version 2>&1` in
431 *GNU*) ac_cv_path_SED=$ac_path_SED ac_path_SED_found=:;;
434 _AS_ECHO_N([0123456789]) >conftest.in
437 cat conftest.in conftest.in >conftest.tmp
438 mv conftest.tmp conftest.in
439 cp conftest.in conftest.nl
441 "$ac_path_SED" -f conftest.sed <conftest.nl >conftest.out 2>/dev/null || break
442 diff conftest.out conftest.nl >/dev/null 2>&1 || break
443 ac_count=`expr $ac_count + 1`
444 if test $ac_count -gt ${ac_path_SED_max-0}; then
445 # Best so far, but keep looking for better
446 ac_cv_path_SED=$ac_path_SED
447 ac_path_SED_max=$ac_count
449 test $ac_count -gt 10 && break
451 rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
453 $ac_path_SED_found && break 3
456 if test -z "$ac_cv_path_SED"; then
457 AC_ERROR([no acceptable sed could be found in \$PATH])
463 SED="$ac_cv_path_SED"