1 # gnulib-common.m4 serial 65
2 dnl Copyright (C) 2007-2021 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.
10 # is expanded unconditionally through gnulib-tool magic.
11 AC_DEFUN([gl_COMMON], [
12 dnl Use AC_REQUIRE here, so that the code is expanded once only.
13 AC_REQUIRE([gl_00GNULIB])
14 AC_REQUIRE([gl_COMMON_BODY])
15 AC_REQUIRE([gl_ZZGNULIB])
17 AC_DEFUN([gl_COMMON_BODY], [
18 AH_VERBATIM([_GL_GNUC_PREREQ],
19 [/* True if the compiler says it groks GNU C version MAJOR.MINOR. */
20 #if defined __GNUC__ && defined __GNUC_MINOR__
21 # define _GL_GNUC_PREREQ(major, minor) \
22 ((major) < __GNUC__ + ((minor) <= __GNUC_MINOR__))
24 # define _GL_GNUC_PREREQ(major, minor) 0
27 AH_VERBATIM([_Noreturn],
28 [/* The _Noreturn keyword of C11. */
30 # if (defined __cplusplus \
31 && ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
32 || (defined _MSC_VER && 1900 <= _MSC_VER)) \
34 /* [[noreturn]] is not practically usable, because with it the syntax
35 extern _Noreturn void func (...);
36 would not be valid; such a declaration would only be valid with 'extern'
37 and '_Noreturn' swapped, or without the 'extern' keyword. However, some
38 AIX system header files and several gnulib header files use precisely
39 this syntax with 'extern'. */
40 # define _Noreturn [[noreturn]]
41 # elif ((!defined __cplusplus || defined __clang__) \
42 && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) \
43 || (!defined __STRICT_ANSI__ \
44 && (_GL_GNUC_PREREQ (4, 7) \
45 || (defined __apple_build_version__ \
46 ? 6000000 <= __apple_build_version__ \
47 : 3 < __clang_major__ + (5 <= __clang_minor__))))))
48 /* _Noreturn works as-is. */
49 # elif _GL_GNUC_PREREQ (2, 8) || defined __clang__ || 0x5110 <= __SUNPRO_C
50 # define _Noreturn __attribute__ ((__noreturn__))
51 # elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
52 # define _Noreturn __declspec (noreturn)
58 AH_VERBATIM([isoc99_inline],
59 [/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports
60 the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of
61 earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.
62 __APPLE__ && __MACH__ test for Mac OS X.
63 __APPLE_CC__ tests for the Apple compiler and its version.
64 __STDC_VERSION__ tests for the C99 mode. */
65 #if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
66 # define __GNUC_STDC_INLINE__ 1
68 AH_VERBATIM([attribute],
70 #if (defined __has_attribute \
71 && (!defined __clang_minor__ \
72 || 3 < __clang_major__ + (5 <= __clang_minor__)))
73 # define _GL_HAS_ATTRIBUTE(attr) __has_attribute (__##attr##__)
75 # define _GL_HAS_ATTRIBUTE(attr) _GL_ATTR_##attr
76 # define _GL_ATTR_alloc_size _GL_GNUC_PREREQ (4, 3)
77 # define _GL_ATTR_always_inline _GL_GNUC_PREREQ (3, 2)
78 # define _GL_ATTR_artificial _GL_GNUC_PREREQ (4, 3)
79 # define _GL_ATTR_cold _GL_GNUC_PREREQ (4, 3)
80 # define _GL_ATTR_const _GL_GNUC_PREREQ (2, 95)
81 # define _GL_ATTR_deprecated _GL_GNUC_PREREQ (3, 1)
82 # define _GL_ATTR_diagnose_if 0
83 # define _GL_ATTR_error _GL_GNUC_PREREQ (4, 3)
84 # define _GL_ATTR_externally_visible _GL_GNUC_PREREQ (4, 1)
85 # define _GL_ATTR_fallthrough _GL_GNUC_PREREQ (7, 0)
86 # define _GL_ATTR_format _GL_GNUC_PREREQ (2, 7)
87 # define _GL_ATTR_leaf _GL_GNUC_PREREQ (4, 6)
89 # define _GL_ATTR_may_alias 0
91 # define _GL_ATTR_may_alias _GL_GNUC_PREREQ (3, 3)
93 # define _GL_ATTR_malloc _GL_GNUC_PREREQ (3, 0)
94 # define _GL_ATTR_noinline _GL_GNUC_PREREQ (3, 1)
95 # define _GL_ATTR_nonnull _GL_GNUC_PREREQ (3, 3)
96 # define _GL_ATTR_nonstring _GL_GNUC_PREREQ (8, 0)
97 # define _GL_ATTR_nothrow _GL_GNUC_PREREQ (3, 3)
98 # define _GL_ATTR_packed _GL_GNUC_PREREQ (2, 7)
99 # define _GL_ATTR_pure _GL_GNUC_PREREQ (2, 96)
100 # define _GL_ATTR_returns_nonnull _GL_GNUC_PREREQ (4, 9)
101 # define _GL_ATTR_sentinel _GL_GNUC_PREREQ (4, 0)
102 # define _GL_ATTR_unused _GL_GNUC_PREREQ (2, 7)
103 # define _GL_ATTR_warn_unused_result _GL_GNUC_PREREQ (3, 4)
106 ]dnl There is no _GL_ATTRIBUTE_ALIGNED; use stdalign's _Alignas instead.
108 #if _GL_HAS_ATTRIBUTE (alloc_size)
109 # define _GL_ATTRIBUTE_ALLOC_SIZE(args) __attribute__ ((__alloc_size__ args))
111 # define _GL_ATTRIBUTE_ALLOC_SIZE(args)
114 #if _GL_HAS_ATTRIBUTE (always_inline)
115 # define _GL_ATTRIBUTE_ALWAYS_INLINE __attribute__ ((__always_inline__))
117 # define _GL_ATTRIBUTE_ALWAYS_INLINE
120 #if _GL_HAS_ATTRIBUTE (artificial)
121 # define _GL_ATTRIBUTE_ARTIFICIAL __attribute__ ((__artificial__))
123 # define _GL_ATTRIBUTE_ARTIFICIAL
126 /* Avoid __attribute__ ((cold)) on MinGW; see thread starting at
127 <https://lists.gnu.org/r/emacs-devel/2019-04/msg01152.html>.
128 Also, Oracle Studio 12.6 requires 'cold' not '__cold__'. */
129 #if _GL_HAS_ATTRIBUTE (cold) && !defined __MINGW32__
131 # define _GL_ATTRIBUTE_COLD __attribute__ ((__cold__))
133 # define _GL_ATTRIBUTE_COLD __attribute__ ((cold))
136 # define _GL_ATTRIBUTE_COLD
139 #if _GL_HAS_ATTRIBUTE (const)
140 # define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
142 # define _GL_ATTRIBUTE_CONST
145 #if 201710L < __STDC_VERSION__
146 # define _GL_ATTRIBUTE_DEPRECATED [[__deprecated__]]
147 #elif _GL_HAS_ATTRIBUTE (deprecated)
148 # define _GL_ATTRIBUTE_DEPRECATED __attribute__ ((__deprecated__))
150 # define _GL_ATTRIBUTE_DEPRECATED
153 #if _GL_HAS_ATTRIBUTE (error)
154 # define _GL_ATTRIBUTE_ERROR(msg) __attribute__ ((__error__ (msg)))
155 # define _GL_ATTRIBUTE_WARNING(msg) __attribute__ ((__warning__ (msg)))
156 #elif _GL_HAS_ATTRIBUTE (diagnose_if)
157 # define _GL_ATTRIBUTE_ERROR(msg) __attribute__ ((__diagnose_if__ (1, msg, "error")))
158 # define _GL_ATTRIBUTE_WARNING(msg) __attribute__ ((__diagnose_if__ (1, msg, "warning")))
160 # define _GL_ATTRIBUTE_ERROR(msg)
161 # define _GL_ATTRIBUTE_WARNING(msg)
164 #if _GL_HAS_ATTRIBUTE (externally_visible)
165 # define _GL_ATTRIBUTE_EXTERNALLY_VISIBLE __attribute__ ((externally_visible))
167 # define _GL_ATTRIBUTE_EXTERNALLY_VISIBLE
170 /* FALLTHROUGH is special, because it always expands to something. */
171 #if 201710L < __STDC_VERSION__
172 # define _GL_ATTRIBUTE_FALLTHROUGH [[__fallthrough__]]
173 #elif _GL_HAS_ATTRIBUTE (fallthrough)
174 # define _GL_ATTRIBUTE_FALLTHROUGH __attribute__ ((__fallthrough__))
176 # define _GL_ATTRIBUTE_FALLTHROUGH ((void) 0)
179 #if _GL_HAS_ATTRIBUTE (format)
180 # define _GL_ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
182 # define _GL_ATTRIBUTE_FORMAT(spec)
185 #if _GL_HAS_ATTRIBUTE (leaf)
186 # define _GL_ATTRIBUTE_LEAF __attribute__ ((__leaf__))
188 # define _GL_ATTRIBUTE_LEAF
191 /* Oracle Studio 12.6 mishandles may_alias despite __has_attribute OK. */
192 #if _GL_HAS_ATTRIBUTE (may_alias) && !defined __SUNPRO_C
193 # define _GL_ATTRIBUTE_MAY_ALIAS __attribute__ ((__may_alias__))
195 # define _GL_ATTRIBUTE_MAY_ALIAS
198 #if 201710L < __STDC_VERSION__
199 # define _GL_ATTRIBUTE_MAYBE_UNUSED [[__maybe_unused__]]
200 #elif _GL_HAS_ATTRIBUTE (unused)
201 # define _GL_ATTRIBUTE_MAYBE_UNUSED __attribute__ ((__unused__))
203 # define _GL_ATTRIBUTE_MAYBE_UNUSED
205 /* Earlier spellings of this macro. */
206 #define _GL_UNUSED _GL_ATTRIBUTE_MAYBE_UNUSED
207 #define _UNUSED_PARAMETER_ _GL_ATTRIBUTE_MAYBE_UNUSED
209 #if _GL_HAS_ATTRIBUTE (malloc)
210 # define _GL_ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
212 # define _GL_ATTRIBUTE_MALLOC
215 #if 201710L < __STDC_VERSION__
216 # define _GL_ATTRIBUTE_NODISCARD [[__nodiscard__]]
217 #elif _GL_HAS_ATTRIBUTE (warn_unused_result)
218 # define _GL_ATTRIBUTE_NODISCARD __attribute__ ((__warn_unused_result__))
220 # define _GL_ATTRIBUTE_NODISCARD
223 #if _GL_HAS_ATTRIBUTE (noinline)
224 # define _GL_ATTRIBUTE_NOINLINE __attribute__ ((__noinline__))
226 # define _GL_ATTRIBUTE_NOINLINE
229 #if _GL_HAS_ATTRIBUTE (nonnull)
230 # define _GL_ATTRIBUTE_NONNULL(args) __attribute__ ((__nonnull__ args))
232 # define _GL_ATTRIBUTE_NONNULL(args)
235 #if _GL_HAS_ATTRIBUTE (nonstring)
236 # define _GL_ATTRIBUTE_NONSTRING __attribute__ ((__nonstring__))
238 # define _GL_ATTRIBUTE_NONSTRING
241 /* There is no _GL_ATTRIBUTE_NORETURN; use _Noreturn instead. */
243 #if _GL_HAS_ATTRIBUTE (nothrow) && !defined __cplusplus
244 # define _GL_ATTRIBUTE_NOTHROW __attribute__ ((__nothrow__))
246 # define _GL_ATTRIBUTE_NOTHROW
249 #if _GL_HAS_ATTRIBUTE (packed)
250 # define _GL_ATTRIBUTE_PACKED __attribute__ ((__packed__))
252 # define _GL_ATTRIBUTE_PACKED
255 #if _GL_HAS_ATTRIBUTE (pure)
256 # define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
258 # define _GL_ATTRIBUTE_PURE
261 #if _GL_HAS_ATTRIBUTE (returns_nonnull)
262 # define _GL_ATTRIBUTE_RETURNS_NONNULL __attribute__ ((__returns_nonnull__))
264 # define _GL_ATTRIBUTE_RETURNS_NONNULL
267 #if _GL_HAS_ATTRIBUTE (sentinel)
268 # define _GL_ATTRIBUTE_SENTINEL(pos) __attribute__ ((__sentinel__ pos))
270 # define _GL_ATTRIBUTE_SENTINEL(pos)
273 ]dnl There is no _GL_ATTRIBUTE_VISIBILITY; see m4/visibility.m4 instead.
275 /* To support C++ as well as C, use _GL_UNUSED_LABEL with trailing ';'. */
276 #if !defined __cplusplus || _GL_GNUC_PREREQ (4, 5)
277 # define _GL_UNUSED_LABEL _GL_ATTRIBUTE_MAYBE_UNUSED
279 # define _GL_UNUSED_LABEL
282 AH_VERBATIM([async_safe],
283 [/* The _GL_ASYNC_SAFE marker should be attached to functions that are
284 signal handlers (for signals other than SIGABRT, SIGPIPE) or can be
285 invoked from such signal handlers. Such functions have some restrictions:
286 * All functions that it calls should be marked _GL_ASYNC_SAFE as well,
287 or should be listed as async-signal-safe in POSIX
288 <https://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_04>
289 section 2.4.3. Note that malloc(), sprintf(), and fwrite(), in
290 particular, are NOT async-signal-safe.
291 * All memory locations (variables and struct fields) that these functions
292 access must be marked 'volatile'. This holds for both read and write
293 accesses. Otherwise the compiler might optimize away stores to and
294 reads from such locations that occur in the program, depending on its
295 data flow analysis. For example, when the program contains a loop
296 that is intended to inspect a variable set from within a signal handler
297 while (!signal_occurred)
299 the compiler is allowed to transform this into an endless loop if the
300 variable 'signal_occurred' is not declared 'volatile'.
301 Additionally, recall that:
302 * A signal handler should not modify errno (except if it is a handler
303 for a fatal signal and ends by raising the same signal again, thus
304 provoking the termination of the process). If it invokes a function
305 that may clobber errno, it needs to save and restore the value of
307 #define _GL_ASYNC_SAFE
309 AH_VERBATIM([micro_optimizations],
310 [/* _GL_CMP (n1, n2) performs a three-valued comparison on n1 vs. n2, where
311 n1 and n2 are expressions without side effects, that evaluate to real
312 numbers (excluding NaN).
317 The naïve code (n1 > n2 ? 1 : n1 < n2 ? -1 : 0) produces a conditional
318 jump with nearly all GCC versions up to GCC 10.
319 This variant (n1 < n2 ? -1 : n1 > n2) produces a conditional with many
320 GCC versions up to GCC 9.
321 The better code (n1 > n2) - (n1 < n2) from Hacker's Delight § 2-9
322 avoids conditional jumps in all GCC versions >= 3.4. */
323 #define _GL_CMP(n1, n2) (((n1) > (n2)) - ((n1) < (n2)))
325 dnl Hint which direction to take regarding cross-compilation guesses:
326 dnl When a user installs a program on a platform they are not intimately
327 dnl familiar with, --enable-cross-guesses=conservative is the appropriate
328 dnl choice. It implements the "If we don't know, assume the worst" principle.
329 dnl However, when an operating system developer (on a platform which is not
330 dnl yet known to gnulib) builds packages for their platform, they want to
331 dnl expose, not hide, possible platform bugs; in this case,
332 dnl --enable-cross-guesses=risky is the appropriate choice.
333 dnl Sets the variables
334 dnl gl_cross_guess_normal (to be used when 'yes' is good and 'no' is bad),
335 dnl gl_cross_guess_inverted (to be used when 'no' is good and 'yes' is bad).
336 AC_ARG_ENABLE([cross-guesses],
337 [AS_HELP_STRING([--enable-cross-guesses={conservative|risky}],
338 [specify policy for cross-compilation guesses])],
339 [if test "x$enableval" != xconservative && test "x$enableval" != xrisky; then
340 AC_MSG_WARN([invalid argument supplied to --enable-cross-guesses])
341 enableval=conservative
343 gl_cross_guesses="$enableval"],
344 [gl_cross_guesses=conservative])
345 if test $gl_cross_guesses = risky; then
346 gl_cross_guess_normal="guessing yes"
347 gl_cross_guess_inverted="guessing no"
349 gl_cross_guess_normal="guessing no"
350 gl_cross_guess_inverted="guessing yes"
352 dnl Preparation for running test programs:
353 dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not
354 dnl to /dev/tty, so they can be redirected to log files. Such diagnostics
355 dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.
357 export LIBC_FATAL_STDERR_
360 # gl_MODULE_INDICATOR_INIT_VARIABLE([variablename])
361 # gl_MODULE_INDICATOR_INIT_VARIABLE([variablename], [initialvalue])
362 # initializes the shell variable that indicates the presence of the given module
363 # as a C preprocessor expression.
364 AC_DEFUN([gl_MODULE_INDICATOR_INIT_VARIABLE],
366 GL_MODULE_INDICATOR_PREFIX[]_[$1]=m4_if([$2], , [0], [$2])
367 AC_SUBST(GL_MODULE_INDICATOR_PREFIX[]_[$1])
370 # gl_MODULE_INDICATOR_CONDITION
371 # expands to a C preprocessor expression that evaluates to 1 or 0, depending
372 # whether a gnulib module that has been requested shall be considered present
374 m4_define([gl_MODULE_INDICATOR_CONDITION], [1])
376 # gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
377 # sets the shell variable that indicates the presence of the given module to
378 # a C preprocessor expression that will evaluate to 1.
379 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
381 gl_MODULE_INDICATOR_SET_VARIABLE_AUX(
382 [GL_MODULE_INDICATOR_PREFIX[]_GNULIB_[]m4_translit([[$1]],
383 [abcdefghijklmnopqrstuvwxyz./-],
384 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
385 [gl_MODULE_INDICATOR_CONDITION])
388 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable])
389 # modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION.
390 # The shell variable's value is a C preprocessor expression that evaluates
392 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX],
394 m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1],
396 dnl Simplify the expression VALUE || 1 to 1.
399 [gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1],
400 [gl_MODULE_INDICATOR_CONDITION])])
403 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition])
404 # modifies the shell variable to include the given condition. The shell
405 # variable's value is a C preprocessor expression that evaluates to 0 or 1.
406 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR],
408 dnl Simplify the expression 1 || CONDITION to 1.
409 if test "$[]$1" != 1; then
410 dnl Simplify the expression 0 || CONDITION to CONDITION.
411 if test "$[]$1" = 0; then
419 # gl_MODULE_INDICATOR([modulename])
420 # defines a C macro indicating the presence of the given module
421 # in a location where it can be used.
423 # | in lib/ | in tests/ |
424 # --------------------------------------------+---------+-----------+
425 # Module present among main modules: | 1 | 1 |
426 # --------------------------------------------+---------+-----------+
427 # Module present among tests-related modules: | 0 | 1 |
428 # --------------------------------------------+---------+-----------+
429 # Module not present at all: | 0 | 0 |
430 # --------------------------------------------+---------+-----------+
431 AC_DEFUN([gl_MODULE_INDICATOR],
433 AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],
434 [abcdefghijklmnopqrstuvwxyz./-],
435 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),
436 [gl_MODULE_INDICATOR_CONDITION],
437 [Define to a C preprocessor expression that evaluates to 1 or 0,
438 depending whether the gnulib module $1 shall be considered present.])
441 # gl_MODULE_INDICATOR_FOR_TESTS([modulename])
442 # defines a C macro indicating the presence of the given module
443 # in lib or tests. This is useful to determine whether the module
446 # | in lib/ | in tests/ |
447 # --------------------------------------------+---------+-----------+
448 # Module present among main modules: | 1 | 1 |
449 # --------------------------------------------+---------+-----------+
450 # Module present among tests-related modules: | 1 | 1 |
451 # --------------------------------------------+---------+-----------+
452 # Module not present at all: | 0 | 0 |
453 # --------------------------------------------+---------+-----------+
454 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],
456 AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],
457 [abcdefghijklmnopqrstuvwxyz./-],
458 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
459 [Define to 1 when the gnulib module $1 should be tested.])
462 # gl_ASSERT_NO_GNULIB_POSIXCHECK
463 # asserts that there will never be a need to #define GNULIB_POSIXCHECK.
464 # and thereby enables an optimization of configure and config.h.
466 AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
468 dnl Override gl_WARN_ON_USE_PREPARE.
469 dnl But hide this definition from 'aclocal'.
470 AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], [])
473 # gl_ASSERT_NO_GNULIB_TESTS
474 # asserts that there will be no gnulib tests in the scope of the configure.ac
475 # and thereby enables an optimization of config.h.
477 AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
479 dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
480 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
483 # Test whether <features.h> exists.
484 # Set HAVE_FEATURES_H.
485 AC_DEFUN([gl_FEATURES_H],
487 AC_CHECK_HEADERS_ONCE([features.h])
488 if test $ac_cv_header_features_h = yes; then
493 AC_SUBST([HAVE_FEATURES_H])
497 # Modifies the value of the shell variable CC in an attempt to make $CC
498 # understand ISO C99 source code.
499 AC_DEFUN([gl_PROG_CC_C99],
501 dnl Just use AC_PROG_CC_C99.
502 dnl When AC_PROG_CC_C99 and AC_PROG_CC_STDC are used together, the substituted
503 dnl value of CC will contain the C99 enabling options twice. But this is only
504 dnl a cosmetic problem.
505 dnl With Autoconf >= 2.70, use AC_PROG_CC since it implies AC_PROG_CC_C99;
506 dnl this avoids a "warning: The macro `AC_PROG_CC_C99' is obsolete."
507 m4_version_prereq([2.70],
508 [AC_REQUIRE([AC_PROG_CC])],
509 [AC_REQUIRE([AC_PROG_CC_C99])])
513 # Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler.
514 # The user can set the variables AR, ARFLAGS, RANLIB if he wants to override
516 AC_DEFUN([gl_PROG_AR_RANLIB],
518 dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler
519 dnl as "cc", and GCC as "gcc". They have different object file formats and
520 dnl library formats. In particular, the GNU binutils programs ar and ranlib
521 dnl produce libraries that work only with gcc, not with cc.
522 AC_REQUIRE([AC_PROG_CC])
523 dnl The '][' hides this use from 'aclocal'.
524 AC_BEFORE([$0], [A][M_PROG_AR])
525 AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler],
527 AC_EGREP_CPP([Amsterdam],
533 [gl_cv_c_amsterdam_compiler=yes],
534 [gl_cv_c_amsterdam_compiler=no])
537 dnl Don't compete with AM_PROG_AR's decision about AR/ARFLAGS if we are not
538 dnl building with __ACK__.
539 if test $gl_cv_c_amsterdam_compiler = yes; then
540 if test -z "$AR"; then
543 if test -z "$ARFLAGS"; then
547 dnl AM_PROG_AR was added in automake v1.11.2. AM_PROG_AR does not AC_SUBST
548 dnl ARFLAGS variable (it is filed into Makefile.in directly by automake
549 dnl script on-demand, if not specified by ./configure of course).
550 dnl Don't AC_REQUIRE the AM_PROG_AR otherwise the code for __ACK__ above
551 dnl will be ignored. Also, pay attention to call AM_PROG_AR in else block
552 dnl because AM_PROG_AR is written so it could re-set AR variable even for
553 dnl __ACK__. It may seem like its easier to avoid calling the macro here,
554 dnl but we need to AC_SUBST both AR/ARFLAGS (thus those must have some good
555 dnl default value and automake should usually know them).
557 dnl The '][' hides this use from 'aclocal'.
558 m4_ifdef([A][M_PROG_AR], [A][M_PROG_AR], [:])
561 dnl In case the code above has not helped with setting AR/ARFLAGS, use
562 dnl Automake-documented default values for AR and ARFLAGS, but prefer
563 dnl ${host}-ar over ar (useful for cross-compiling).
564 AC_CHECK_TOOL([AR], [ar], [ar])
565 if test -z "$ARFLAGS"; then
571 if test -z "$RANLIB"; then
572 if test $gl_cv_c_amsterdam_compiler = yes; then
575 dnl Use the ranlib program if it is available.
583 # This definition is copied from post-2.70 Autoconf and overrides the
584 # AC_C_RESTRICT macro from autoconf 2.60..2.70.
585 m4_version_prereq([2.70.1], [], [
586 AC_DEFUN([AC_C_RESTRICT],
587 [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
589 # Put '__restrict__' first, to avoid problems with glibc and non-GCC; see:
590 # https://lists.gnu.org/archive/html/bug-autoconf/2016-02/msg00006.html
591 # Put 'restrict' last, because C++ lacks it.
592 for ac_kw in __restrict__ __restrict _Restrict restrict; do
595 [[typedef int *int_ptr;
596 int foo (int_ptr $ac_kw ip) { return ip[0]; }
597 int bar (int [$ac_kw]); /* Catch GCC bug 14050. */
598 int bar (int ip[$ac_kw]) { return ip[0]; }
603 return foo (t) + bar (t);
605 [ac_cv_c_restrict=$ac_kw])
606 test "$ac_cv_c_restrict" != no && break
609 AH_VERBATIM([restrict],
610 [/* Define to the equivalent of the C99 'restrict' keyword, or to
611 nothing if this is not supported. Do not define if restrict is
612 supported only directly. */
614 /* Work around a bug in older versions of Sun C++, which did not
615 #define __restrict__ or support _Restrict or __restrict__
616 even though the corresponding Sun C compiler ended up with
617 "#define restrict _Restrict" or "#define restrict __restrict__"
618 in the previous line. This workaround can be removed once
619 we assume Oracle Developer Studio 12.5 (2016) or later. */
620 #if defined __SUNPRO_CC && !defined __RESTRICT && !defined __restrict__
622 # define __restrict__
624 case $ac_cv_c_restrict in
626 no) AC_DEFINE([restrict], []) ;;
627 *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
633 # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
634 # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
635 # macros invoke AC_C_BIGENDIAN with arguments.
636 AC_DEFUN([gl_BIGENDIAN],
641 # A temporary file descriptor.
642 # Must be less than 10, because dash 0.5.8 does not support redirections
643 # with multi-digit file descriptors.
644 m4_define([GL_TMP_FD], 9)
647 # executes command, but without the normal configure output.
648 # This is useful when you want to invoke AC_CACHE_CHECK (or AC_CHECK_FUNC etc.)
649 # inside another AC_CACHE_CHECK.
650 AC_DEFUN([gl_SILENT],
652 exec GL_TMP_FD>&AS_MESSAGE_FD AS_MESSAGE_FD>/dev/null
654 exec AS_MESSAGE_FD>&GL_TMP_FD GL_TMP_FD>&-
657 # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
658 # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
659 # output a spurious "(cached)" mark in the midst of other configure output.
660 # This macro should be used instead of AC_CACHE_VAL when it is not surrounded
661 # by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
662 AC_DEFUN([gl_CACHE_VAL_SILENT],
665 AC_CACHE_VAL([$1], [$2])
669 dnl Expands to some code for use in .c programs that, on native Windows, defines
670 dnl the Microsoft deprecated alias function names to the underscore-prefixed
671 dnl actual function names. With this macro, these function names are available
672 dnl without linking with '-loldnames' and without generating warnings.
673 dnl Usage: Use it after all system header files are included.
678 AC_DEFUN([GL_MDA_DEFINES],[
679 AC_REQUIRE([_GL_MDA_DEFINES])
682 AC_DEFUN([_GL_MDA_DEFINES],
684 #if defined _WIN32 && !defined __CYGWIN__
685 #define access _access
694 #define execle _execle
695 #define execlp _execlp
697 #define execve _execve
698 #define execvp _execvp
699 #define execvpe _execvpe
700 #define fcloseall _fcloseall
702 #define fdopen _fdopen
703 #define fileno _fileno
705 #define getcwd _getcwd
706 #define getpid _getpid
708 #define isatty _isatty
713 #define lsearch _lsearch
715 #define memccpy _memccpy
717 #define mktemp _mktemp
719 #define putenv _putenv
723 #define strdup _strdup
725 #define tempnam _tempnam
728 #define unlink _unlink
730 #define wcsdup _wcsdup