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1 office 1 # gnulib-common.m4 serial 36
2 dnl Copyright (C) 2007-2016 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.
6  
7 # gl_COMMON
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])
13 ])
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)
24 # else
25 # define _Noreturn
26 # endif
27 #endif
28 ])
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
38 #endif])
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__))
45 #else
46 # define _GL_UNUSED
47 #endif
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
51  
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
58 #else
59 # define _GL_UNUSED_LABEL
60 #endif
61  
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__))
65 #else
66 # define _GL_ATTRIBUTE_PURE /* empty */
67 #endif
68  
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__))
72 #else
73 # define _GL_ATTRIBUTE_CONST /* empty */
74 #endif
75 ])
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.
80 LIBC_FATAL_STDERR_=1
81 export LIBC_FATAL_STDERR_
82 ])
83  
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
87 # or not.
88 m4_define([gl_MODULE_INDICATOR_CONDITION], [1])
89  
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],
94 [
95 gl_MODULE_INDICATOR_SET_VARIABLE_AUX(
96 [GNULIB_[]m4_translit([[$1]],
97 [abcdefghijklmnopqrstuvwxyz./-],
98 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
99 [gl_MODULE_INDICATOR_CONDITION])
100 ])
101  
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
105 # to 0 or 1.
106 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX],
107 [
108 m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1],
109 [
110 dnl Simplify the expression VALUE || 1 to 1.
111 $1=1
112 ],
113 [gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1],
114 [gl_MODULE_INDICATOR_CONDITION])])
115 ])
116  
117 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition])
118 # modifies the shell variable to include the given condition. The shell
119 # variable's value is a C preprocessor expression that evaluates to 0 or 1.
120 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR],
121 [
122 dnl Simplify the expression 1 || CONDITION to 1.
123 if test "$[]$1" != 1; then
124 dnl Simplify the expression 0 || CONDITION to CONDITION.
125 if test "$[]$1" = 0; then
126 $1=$2
127 else
128 $1="($[]$1 || $2)"
129 fi
130 fi
131 ])
132  
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.
136 # | Value | Value |
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],
146 [
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.])
153 ])
154  
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
158 # should be tested.
159 # | Value | Value |
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],
169 [
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.])
174 ])
175  
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.
179 # Used by Emacs.
180 AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
181 [
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], [])
185 ])
186  
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.
190 # Used by Emacs.
191 AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
192 [
193 dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
194 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
195 ])
196  
197 # Test whether <features.h> exists.
198 # Set HAVE_FEATURES_H.
199 AC_DEFUN([gl_FEATURES_H],
200 [
201 AC_CHECK_HEADERS_ONCE([features.h])
202 if test $ac_cv_header_features_h = yes; then
203 HAVE_FEATURES_H=1
204 else
205 HAVE_FEATURES_H=0
206 fi
207 AC_SUBST([HAVE_FEATURES_H])
208 ])
209  
210 # m4_foreach_w
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])])])
216  
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])])])
224  
225 # gl_PROG_CC_C99
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 # <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00367.html>,
232 # but many more packages use AC_PROG_CC_STDC than AC_PROG_CC_C99
233 # <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00441.html>.
234 # Remaining problems:
235 # - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options
236 # to CC twice
237 # <http://lists.gnu.org/archive/html/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],
240 [
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])])
246 ])
247  
248 # gl_PROG_AR_RANLIB
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
251 # the values.
252 AC_DEFUN([gl_PROG_AR_RANLIB],
253 [
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 AC_BEFORE([$0], [AM_PROG_AR])
260 AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler],
261 [
262 AC_EGREP_CPP([Amsterdam],
263 [
264 #ifdef __ACK__
265 Amsterdam
266 #endif
267 ],
268 [gl_cv_c_amsterdam_compiler=yes],
269 [gl_cv_c_amsterdam_compiler=no])
270 ])
271  
272 dnl Don't compete with AM_PROG_AR's decision about AR/ARFLAGS if we are not
273 dnl building with __ACK__.
274 if test $gl_cv_c_amsterdam_compiler = yes; then
275 if test -z "$AR"; then
276 AR='cc -c.a'
277 fi
278 if test -z "$ARFLAGS"; then
279 ARFLAGS='-o'
280 fi
281 else
282 dnl AM_PROG_AR was added in automake v1.11.2. AM_PROG_AR does not AC_SUBST
283 dnl ARFLAGS variable (it is filed into Makefile.in directly by automake
284 dnl script on-demand, if not specified by ./configure of course).
285 dnl Don't AC_REQUIRE the AM_PROG_AR otherwise the code for __ACK__ above
286 dnl will be ignored. Also, pay attention to call AM_PROG_AR in else block
287 dnl because AM_PROG_AR is written so it could re-set AR variable even for
288 dnl __ACK__. It may seem like its easier to avoid calling the macro here,
289 dnl but we need to AC_SUBST both AR/ARFLAGS (thus those must have some good
290 dnl default value and automake should usually know them).
291 m4_ifdef([AM_PROG_AR], [AM_PROG_AR], [:])
292 fi
293  
294 dnl In case the code above has not helped with setting AR/ARFLAGS, use
295 dnl Automake-documented default values for AR and ARFLAGS, but prefer
296 dnl ${host}-ar over ar (useful for cross-compiling).
297 AC_CHECK_TOOL([AR], [ar], [ar])
298 if test -z "$ARFLAGS"; then
299 ARFLAGS='cr'
300 fi
301  
302 AC_SUBST([AR])
303 AC_SUBST([ARFLAGS])
304 if test -z "$RANLIB"; then
305 if test $gl_cv_c_amsterdam_compiler = yes; then
306 RANLIB=':'
307 else
308 dnl Use the ranlib program if it is available.
309 AC_PROG_RANLIB
310 fi
311 fi
312 AC_SUBST([RANLIB])
313 ])
314  
315 # AC_PROG_MKDIR_P
316 # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix
317 # for interoperability with automake-1.9.6 from autoconf-2.62.
318 # Remove this macro when we can assume autoconf >= 2.62 or
319 # autoconf >= 2.60 && automake >= 1.10.
320 # AC_AUTOCONF_VERSION was introduced in 2.62, so use that as the witness.
321 m4_ifndef([AC_AUTOCONF_VERSION],[
322 m4_ifdef([AC_PROG_MKDIR_P], [
323 dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed.
324 m4_define([AC_PROG_MKDIR_P],
325 m4_defn([AC_PROG_MKDIR_P])[
326 AC_SUBST([MKDIR_P])])], [
327 dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P.
328 AC_DEFUN_ONCE([AC_PROG_MKDIR_P],
329 [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
330 MKDIR_P='$(mkdir_p)'
331 AC_SUBST([MKDIR_P])])])
332 ])
333  
334 # AC_C_RESTRICT
335 # This definition is copied from post-2.69 Autoconf and overrides the
336 # AC_C_RESTRICT macro from autoconf 2.60..2.69. It can be removed
337 # once autoconf >= 2.70 can be assumed. It's painful to check version
338 # numbers, and in practice this macro is more up-to-date than Autoconf
339 # is, so override Autoconf unconditionally.
340 AC_DEFUN([AC_C_RESTRICT],
341 [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
342 [ac_cv_c_restrict=no
343 # The order here caters to the fact that C++ does not require restrict.
344 for ac_kw in __restrict __restrict__ _Restrict restrict; do
345 AC_COMPILE_IFELSE(
346 [AC_LANG_PROGRAM(
347 [[typedef int *int_ptr;
348 int foo (int_ptr $ac_kw ip) { return ip[0]; }
349 int bar (int [$ac_kw]); /* Catch GCC bug 14050. */
350 int bar (int ip[$ac_kw]) { return ip[0]; }
351 ]],
352 [[int s[1];
353 int *$ac_kw t = s;
354 t[0] = 0;
355 return foo (t) + bar (t);
356 ]])],
357 [ac_cv_c_restrict=$ac_kw])
358 test "$ac_cv_c_restrict" != no && break
359 done
360 ])
361 AH_VERBATIM([restrict],
362 [/* Define to the equivalent of the C99 'restrict' keyword, or to
363 nothing if this is not supported. Do not define if restrict is
364 supported directly. */
365 #undef restrict
366 /* Work around a bug in Sun C++: it does not support _Restrict or
367 __restrict__, even though the corresponding Sun C compiler ends up with
368 "#define restrict _Restrict" or "#define restrict __restrict__" in the
369 previous line. Perhaps some future version of Sun C++ will work with
370 restrict; if so, hopefully it defines __RESTRICT like Sun C does. */
371 #if defined __SUNPRO_CC && !defined __RESTRICT
372 # define _Restrict
373 # define __restrict__
374 #endif])
375 case $ac_cv_c_restrict in
376 restrict) ;;
377 no) AC_DEFINE([restrict], []) ;;
378 *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
379 esac
380 ])# AC_C_RESTRICT
381  
382 # gl_BIGENDIAN
383 # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
384 # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
385 # macros invoke AC_C_BIGENDIAN with arguments.
386 AC_DEFUN([gl_BIGENDIAN],
387 [
388 AC_C_BIGENDIAN
389 ])
390  
391 # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
392 # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
393 # output a spurious "(cached)" mark in the midst of other configure output.
394 # This macro should be used instead of AC_CACHE_VAL when it is not surrounded
395 # by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
396 AC_DEFUN([gl_CACHE_VAL_SILENT],
397 [
398 saved_as_echo_n="$as_echo_n"
399 as_echo_n=':'
400 AC_CACHE_VAL([$1], [$2])
401 as_echo_n="$saved_as_echo_n"
402 ])
403  
404 # AS_VAR_COPY was added in autoconf 2.63b
405 m4_define_default([AS_VAR_COPY],
406 [AS_LITERAL_IF([$1[]$2], [$1=$$2], [eval $1=\$$2])])
407  
408 # AC_PROG_SED was added in autoconf 2.59b
409 m4_ifndef([AC_PROG_SED],
410 [AC_DEFUN([AC_PROG_SED],
411 [AC_CACHE_CHECK([for a sed that does not truncate output], ac_cv_path_SED,
412 [dnl ac_script should not contain more than 99 commands (for HP-UX sed),
413 dnl but more than about 7000 bytes, to catch a limit in Solaris 8 /usr/ucb/sed.
414 ac_script=s/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb/
415 for ac_i in 1 2 3 4 5 6 7; do
416 ac_script="$ac_script$as_nl$ac_script"
417 done
418 echo "$ac_script" 2>/dev/null | sed 99q >conftest.sed
419 AS_UNSET([ac_script])
420 if test -z "$SED"; then
421 ac_path_SED_found=false
422 _AS_PATH_WALK([], [
423 for ac_prog in sed gsed; do
424 for ac_exec_ext in '' $ac_executable_extensions; do
425 ac_path_SED="$as_dir/$ac_prog$ac_exec_ext"
426 AS_EXECUTABLE_P(["$ac_path_SED"]) || continue
427 case `"$ac_path_SED" --version 2>&1` in
428 *GNU*) ac_cv_path_SED=$ac_path_SED ac_path_SED_found=:;;
429 *)
430 ac_count=0
431 _AS_ECHO_N([0123456789]) >conftest.in
432 while :
433 do
434 cat conftest.in conftest.in >conftest.tmp
435 mv conftest.tmp conftest.in
436 cp conftest.in conftest.nl
437 echo >> conftest.nl
438 "$ac_path_SED" -f conftest.sed <conftest.nl >conftest.out 2>/dev/null || break
439 diff conftest.out conftest.nl >/dev/null 2>&1 || break
440 ac_count=`expr $ac_count + 1`
441 if test $ac_count -gt ${ac_path_SED_max-0}; then
442 # Best so far, but keep looking for better
443 ac_cv_path_SED=$ac_path_SED
444 ac_path_SED_max=$ac_count
445 fi
446 test $ac_count -gt 10 && break
447 done
448 rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
449 esac
450 $ac_path_SED_found && break 3
451 done
452 done])
453 if test -z "$ac_cv_path_SED"; then
454 AC_ERROR([no acceptable sed could be found in \$PATH])
455 fi
456 else
457 ac_cv_path_SED=$SED
458 fi
459 SED="$ac_cv_path_SED"
460 AC_SUBST([SED])dnl
461 rm -f conftest.sed
462 ])])])