1 # gnulib-common.m4 serial 35
2 dnl Copyright (C) 2007-2014 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. */
54 #if !defined __cplusplus || __GNUC__ > 4 \
55 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
56 # define _GL_UNUSED_LABEL _GL_UNUSED
58 # define _GL_UNUSED_LABEL
61 /* The __pure__ attribute was added in gcc 2.96. */
62 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
63 # define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
65 # define _GL_ATTRIBUTE_PURE /* empty */
68 /* The __const__ attribute was added in gcc 2.95. */
69 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
70 # define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
72 # define _GL_ATTRIBUTE_CONST /* empty */
75 dnl Preparation for running test programs:
76 dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not
77 dnl to /dev/tty, so they can be redirected to log files. Such diagnostics
78 dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.
80 export LIBC_FATAL_STDERR_
83 # gl_MODULE_INDICATOR_CONDITION
84 # expands to a C preprocessor expression that evaluates to 1 or 0, depending
85 # whether a gnulib module that has been requested shall be considered present
87 m4_define([gl_MODULE_INDICATOR_CONDITION], [1])
89 # gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
90 # sets the shell variable that indicates the presence of the given module to
91 # a C preprocessor expression that will evaluate to 1.
92 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
94 gl_MODULE_INDICATOR_SET_VARIABLE_AUX(
95 [GNULIB_[]m4_translit([[$1]],
96 [abcdefghijklmnopqrstuvwxyz./-],
97 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
98 [gl_MODULE_INDICATOR_CONDITION])
101 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable])
102 # modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION.
103 # The shell variable's value is a C preprocessor expression that evaluates
105 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX],
107 m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1],
109 dnl Simplify the expression VALUE || 1 to 1.
112 [gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1],
113 [gl_MODULE_INDICATOR_CONDITION])])
116 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition])
117 # modifies the shell variable to include the given condition. The shell
118 # variable's value is a C preprocessor expression that evaluates to 0 or 1.
119 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR],
121 dnl Simplify the expression 1 || CONDITION to 1.
122 if test "$[]$1" != 1; then
123 dnl Simplify the expression 0 || CONDITION to CONDITION.
124 if test "$[]$1" = 0; then
132 # gl_MODULE_INDICATOR([modulename])
133 # defines a C macro indicating the presence of the given module
134 # in a location where it can be used.
136 # | in lib/ | in tests/ |
137 # --------------------------------------------+---------+-----------+
138 # Module present among main modules: | 1 | 1 |
139 # --------------------------------------------+---------+-----------+
140 # Module present among tests-related modules: | 0 | 1 |
141 # --------------------------------------------+---------+-----------+
142 # Module not present at all: | 0 | 0 |
143 # --------------------------------------------+---------+-----------+
144 AC_DEFUN([gl_MODULE_INDICATOR],
146 AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],
147 [abcdefghijklmnopqrstuvwxyz./-],
148 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),
149 [gl_MODULE_INDICATOR_CONDITION],
150 [Define to a C preprocessor expression that evaluates to 1 or 0,
151 depending whether the gnulib module $1 shall be considered present.])
154 # gl_MODULE_INDICATOR_FOR_TESTS([modulename])
155 # defines a C macro indicating the presence of the given module
156 # in lib or tests. This is useful to determine whether the module
159 # | in lib/ | in tests/ |
160 # --------------------------------------------+---------+-----------+
161 # Module present among main modules: | 1 | 1 |
162 # --------------------------------------------+---------+-----------+
163 # Module present among tests-related modules: | 1 | 1 |
164 # --------------------------------------------+---------+-----------+
165 # Module not present at all: | 0 | 0 |
166 # --------------------------------------------+---------+-----------+
167 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],
169 AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],
170 [abcdefghijklmnopqrstuvwxyz./-],
171 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
172 [Define to 1 when the gnulib module $1 should be tested.])
175 # gl_ASSERT_NO_GNULIB_POSIXCHECK
176 # asserts that there will never be a need to #define GNULIB_POSIXCHECK.
177 # and thereby enables an optimization of configure and config.h.
179 AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
181 dnl Override gl_WARN_ON_USE_PREPARE.
182 dnl But hide this definition from 'aclocal'.
183 AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], [])
186 # gl_ASSERT_NO_GNULIB_TESTS
187 # asserts that there will be no gnulib tests in the scope of the configure.ac
188 # and thereby enables an optimization of config.h.
190 AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
192 dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
193 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
196 # Test whether <features.h> exists.
197 # Set HAVE_FEATURES_H.
198 AC_DEFUN([gl_FEATURES_H],
200 AC_CHECK_HEADERS_ONCE([features.h])
201 if test $ac_cv_header_features_h = yes; then
206 AC_SUBST([HAVE_FEATURES_H])
210 # is a backport of autoconf-2.59c's m4_foreach_w.
211 # Remove this macro when we can assume autoconf >= 2.60.
212 m4_ifndef([m4_foreach_w],
213 [m4_define([m4_foreach_w],
214 [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
216 # AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])
217 # ----------------------------------------------------
218 # Backport of autoconf-2.63b's macro.
219 # Remove this macro when we can assume autoconf >= 2.64.
220 m4_ifndef([AS_VAR_IF],
221 [m4_define([AS_VAR_IF],
222 [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
225 # Modifies the value of the shell variable CC in an attempt to make $CC
226 # understand ISO C99 source code.
227 # This is like AC_PROG_CC_C99, except that
228 # - AC_PROG_CC_C99 did not exist in Autoconf versions < 2.60,
229 # - AC_PROG_CC_C99 does not mix well with AC_PROG_CC_STDC
230 # <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00367.html>,
231 # but many more packages use AC_PROG_CC_STDC than AC_PROG_CC_C99
232 # <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00441.html>.
233 # Remaining problems:
234 # - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options
236 # <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00431.html>.
237 # - AC_PROG_CC_STDC is likely to change now that C11 is an ISO standard.
238 AC_DEFUN([gl_PROG_CC_C99],
240 dnl Change that version number to the minimum Autoconf version that supports
241 dnl mixing AC_PROG_CC_C99 calls with AC_PROG_CC_STDC calls.
242 m4_version_prereq([9.0],
243 [AC_REQUIRE([AC_PROG_CC_C99])],
244 [AC_REQUIRE([AC_PROG_CC_STDC])])
248 # Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler.
249 # The user can set the variables AR, ARFLAGS, RANLIB if he wants to override
251 AC_DEFUN([gl_PROG_AR_RANLIB],
253 dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler
254 dnl as "cc", and GCC as "gcc". They have different object file formats and
255 dnl library formats. In particular, the GNU binutils programs ar, ranlib
256 dnl produce libraries that work only with gcc, not with cc.
257 AC_REQUIRE([AC_PROG_CC])
258 AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler],
260 AC_EGREP_CPP([Amsterdam],
266 [gl_cv_c_amsterdam_compiler=yes],
267 [gl_cv_c_amsterdam_compiler=no])
269 if test -z "$AR"; then
270 if test $gl_cv_c_amsterdam_compiler = yes; then
272 if test -z "$ARFLAGS"; then
276 dnl Use the Automake-documented default values for AR and ARFLAGS,
277 dnl but prefer ${host}-ar over ar (useful for cross-compiling).
278 AC_CHECK_TOOL([AR], [ar], [ar])
279 if test -z "$ARFLAGS"; then
284 if test -z "$ARFLAGS"; then
290 if test -z "$RANLIB"; then
291 if test $gl_cv_c_amsterdam_compiler = yes; then
294 dnl Use the ranlib program if it is available.
302 # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix
303 # for interoperability with automake-1.9.6 from autoconf-2.62.
304 # Remove this macro when we can assume autoconf >= 2.62 or
305 # autoconf >= 2.60 && automake >= 1.10.
306 # AC_AUTOCONF_VERSION was introduced in 2.62, so use that as the witness.
307 m4_ifndef([AC_AUTOCONF_VERSION],[
308 m4_ifdef([AC_PROG_MKDIR_P], [
309 dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed.
310 m4_define([AC_PROG_MKDIR_P],
311 m4_defn([AC_PROG_MKDIR_P])[
312 AC_SUBST([MKDIR_P])])], [
313 dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P.
314 AC_DEFUN_ONCE([AC_PROG_MKDIR_P],
315 [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
317 AC_SUBST([MKDIR_P])])])
321 # This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61,
322 # so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++
324 # This definition can be removed once autoconf >= 2.62 can be assumed.
325 # AC_AUTOCONF_VERSION was introduced in 2.62, so use that as the witness.
326 m4_ifndef([AC_AUTOCONF_VERSION],[
327 AC_DEFUN([AC_C_RESTRICT],
328 [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
330 # The order here caters to the fact that C++ does not require restrict.
331 for ac_kw in __restrict __restrict__ _Restrict restrict; do
332 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
333 [[typedef int * int_ptr;
334 int foo (int_ptr $ac_kw ip) {
341 [ac_cv_c_restrict=$ac_kw])
342 test "$ac_cv_c_restrict" != no && break
345 AH_VERBATIM([restrict],
346 [/* Define to the equivalent of the C99 'restrict' keyword, or to
347 nothing if this is not supported. Do not define if restrict is
348 supported directly. */
350 /* Work around a bug in Sun C++: it does not support _Restrict, even
351 though the corresponding Sun C compiler does, which causes
352 "#define restrict _Restrict" in the previous line. Perhaps some future
353 version of Sun C++ will work with _Restrict; if so, it'll probably
354 define __RESTRICT, just as Sun C does. */
355 #if defined __SUNPRO_CC && !defined __RESTRICT
358 case $ac_cv_c_restrict in
360 no) AC_DEFINE([restrict], []) ;;
361 *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
367 # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
368 # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
369 # macros invoke AC_C_BIGENDIAN with arguments.
370 AC_DEFUN([gl_BIGENDIAN],
375 # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
376 # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
377 # output a spurious "(cached)" mark in the midst of other configure output.
378 # This macro should be used instead of AC_CACHE_VAL when it is not surrounded
379 # by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
380 AC_DEFUN([gl_CACHE_VAL_SILENT],
382 saved_as_echo_n="$as_echo_n"
384 AC_CACHE_VAL([$1], [$2])
385 as_echo_n="$saved_as_echo_n"
388 # AS_VAR_COPY was added in autoconf 2.63b
389 m4_define_default([AS_VAR_COPY],
390 [AS_LITERAL_IF([$1[]$2], [$1=$$2], [eval $1=\$$2])])
392 # AC_PROG_SED was added in autoconf 2.59b
393 m4_ifndef([AC_PROG_SED],
394 [AC_DEFUN([AC_PROG_SED],
395 [AC_CACHE_CHECK([for a sed that does not truncate output], ac_cv_path_SED,
396 [dnl ac_script should not contain more than 99 commands (for HP-UX sed),
397 dnl but more than about 7000 bytes, to catch a limit in Solaris 8 /usr/ucb/sed.
398 ac_script=s/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb/
399 for ac_i in 1 2 3 4 5 6 7; do
400 ac_script="$ac_script$as_nl$ac_script"
402 echo "$ac_script" 2>/dev/null | sed 99q >conftest.sed
403 AS_UNSET([ac_script])
404 if test -z "$SED"; then
405 ac_path_SED_found=false
407 for ac_prog in sed gsed; do
408 for ac_exec_ext in '' $ac_executable_extensions; do
409 ac_path_SED="$as_dir/$ac_prog$ac_exec_ext"
410 AS_EXECUTABLE_P(["$ac_path_SED"]) || continue
411 case `"$ac_path_SED" --version 2>&1` in
412 *GNU*) ac_cv_path_SED=$ac_path_SED ac_path_SED_found=:;;
415 _AS_ECHO_N([0123456789]) >conftest.in
418 cat conftest.in conftest.in >conftest.tmp
419 mv conftest.tmp conftest.in
420 cp conftest.in conftest.nl
422 "$ac_path_SED" -f conftest.sed <conftest.nl >conftest.out 2>/dev/null || break
423 diff conftest.out conftest.nl >/dev/null 2>&1 || break
424 ac_count=`expr $ac_count + 1`
425 if test $ac_count -gt ${ac_path_SED_max-0}; then
426 # Best so far, but keep looking for better
427 ac_cv_path_SED=$ac_path_SED
428 ac_path_SED_max=$ac_count
430 test $ac_count -gt 10 && break
432 rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
434 $ac_path_SED_found && break 3
437 if test -z "$ac_cv_path_SED"; then
438 AC_ERROR([no acceptable sed could be found in \$PATH])
443 SED="$ac_cv_path_SED"