1 # gnulib-common.m4 serial 27
2 dnl Copyright (C) 2007-2011 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 draft C1X. */
17 #if ! defined _Noreturn && __STDC_VERSION__ < 201000L
18 # if (3 <= __GNUC__ || __GNUC__ == 2 && 8 <= __GNUC_MINOR__ \
19 || 0x5110 <= __SUNPRO_C)
20 # define _Noreturn __attribute__ ((__noreturn__))
26 AH_VERBATIM([isoc99_inline],
27 [/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports
28 the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of
29 earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.
30 __APPLE__ && __MACH__ test for MacOS X.
31 __APPLE_CC__ tests for the Apple compiler and its version.
32 __STDC_VERSION__ tests for the C99 mode. */
33 #if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
34 # define __GNUC_STDC_INLINE__ 1
36 AH_VERBATIM([unused_parameter],
37 [/* Define as a marker that can be attached to declarations that might not
38 be used. This helps to reduce warnings, such as from
39 GCC -Wunused-parameter. */
40 #if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
41 # define _GL_UNUSED __attribute__ ((__unused__))
45 /* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name
46 is a misnomer outside of parameter lists. */
47 #define _UNUSED_PARAMETER_ _GL_UNUSED
49 /* The __pure__ attribute was added in gcc 2.96. */
50 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
51 # define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
53 # define _GL_ATTRIBUTE_PURE /* empty */
56 /* The __const__ attribute was added in gcc 2.95. */
57 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
58 # define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
60 # define _GL_ATTRIBUTE_CONST /* empty */
63 dnl Preparation for running test programs:
64 dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not
65 dnl to /dev/tty, so they can be redirected to log files. Such diagnostics
66 dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.
68 export LIBC_FATAL_STDERR_
71 # gl_MODULE_INDICATOR_CONDITION
72 # expands to a C preprocessor expression that evaluates to 1 or 0, depending
73 # whether a gnulib module that has been requested shall be considered present
75 m4_define([gl_MODULE_INDICATOR_CONDITION], [1])
77 # gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
78 # sets the shell variable that indicates the presence of the given module to
79 # a C preprocessor expression that will evaluate to 1.
80 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
82 gl_MODULE_INDICATOR_SET_VARIABLE_AUX(
83 [GNULIB_[]m4_translit([[$1]],
84 [abcdefghijklmnopqrstuvwxyz./-],
85 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
86 [gl_MODULE_INDICATOR_CONDITION])
89 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable])
90 # modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION.
91 # The shell variable's value is a C preprocessor expression that evaluates
93 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX],
95 m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1],
97 dnl Simplify the expression VALUE || 1 to 1.
100 [gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1],
101 [gl_MODULE_INDICATOR_CONDITION])])
104 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition])
105 # modifies the shell variable to include the given condition. The shell
106 # variable's value is a C preprocessor expression that evaluates to 0 or 1.
107 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR],
109 dnl Simplify the expression 1 || CONDITION to 1.
110 if test "$[]$1" != 1; then
111 dnl Simplify the expression 0 || CONDITION to CONDITION.
112 if test "$[]$1" = 0; then
120 # gl_MODULE_INDICATOR([modulename])
121 # defines a C macro indicating the presence of the given module
122 # in a location where it can be used.
124 # | in lib/ | in tests/ |
125 # --------------------------------------------+---------+-----------+
126 # Module present among main modules: | 1 | 1 |
127 # --------------------------------------------+---------+-----------+
128 # Module present among tests-related modules: | 0 | 1 |
129 # --------------------------------------------+---------+-----------+
130 # Module not present at all: | 0 | 0 |
131 # --------------------------------------------+---------+-----------+
132 AC_DEFUN([gl_MODULE_INDICATOR],
134 AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],
135 [abcdefghijklmnopqrstuvwxyz./-],
136 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),
137 [gl_MODULE_INDICATOR_CONDITION],
138 [Define to a C preprocessor expression that evaluates to 1 or 0,
139 depending whether the gnulib module $1 shall be considered present.])
142 # gl_MODULE_INDICATOR_FOR_TESTS([modulename])
143 # defines a C macro indicating the presence of the given module
144 # in lib or tests. This is useful to determine whether the module
147 # | in lib/ | in tests/ |
148 # --------------------------------------------+---------+-----------+
149 # Module present among main modules: | 1 | 1 |
150 # --------------------------------------------+---------+-----------+
151 # Module present among tests-related modules: | 1 | 1 |
152 # --------------------------------------------+---------+-----------+
153 # Module not present at all: | 0 | 0 |
154 # --------------------------------------------+---------+-----------+
155 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],
157 AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],
158 [abcdefghijklmnopqrstuvwxyz./-],
159 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
160 [Define to 1 when the gnulib module $1 should be tested.])
163 # gl_ASSERT_NO_GNULIB_POSIXCHECK
164 # asserts that there will never be a need to #define GNULIB_POSIXCHECK.
165 # and thereby enables an optimization of configure and config.h.
167 AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
169 dnl Override gl_WARN_ON_USE_PREPARE.
170 dnl But hide this definition from 'aclocal'.
171 AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], [])
174 # gl_ASSERT_NO_GNULIB_TESTS
175 # asserts that there will be no gnulib tests in the scope of the configure.ac
176 # and thereby enables an optimization of config.h.
178 AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
180 dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
181 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
184 # Test whether <features.h> exists.
185 # Set HAVE_FEATURES_H.
186 AC_DEFUN([gl_FEATURES_H],
188 AC_CHECK_HEADERS_ONCE([features.h])
189 if test $ac_cv_header_features_h = yes; then
194 AC_SUBST([HAVE_FEATURES_H])
198 # is a backport of autoconf-2.59c's m4_foreach_w.
199 # Remove this macro when we can assume autoconf >= 2.60.
200 m4_ifndef([m4_foreach_w],
201 [m4_define([m4_foreach_w],
202 [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
204 # AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])
205 # ----------------------------------------------------
206 # Backport of autoconf-2.63b's macro.
207 # Remove this macro when we can assume autoconf >= 2.64.
208 m4_ifndef([AS_VAR_IF],
209 [m4_define([AS_VAR_IF],
210 [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
213 # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix
214 # for interoperability with automake-1.9.6 from autoconf-2.62.
215 # Remove this macro when we can assume autoconf >= 2.62 or
216 # autoconf >= 2.60 && automake >= 1.10.
217 m4_ifdef([AC_PROG_MKDIR_P], [
218 dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed.
219 m4_define([AC_PROG_MKDIR_P],
220 m4_defn([AC_PROG_MKDIR_P])[
221 AC_SUBST([MKDIR_P])])], [
222 dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P.
223 AC_DEFUN_ONCE([AC_PROG_MKDIR_P],
224 [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
226 AC_SUBST([MKDIR_P])])])
229 # This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61,
230 # so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++
232 # This definition can be removed once autoconf >= 2.62 can be assumed.
233 m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]),[2.62]),[-1],[
234 AC_DEFUN([AC_C_RESTRICT],
235 [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
237 # The order here caters to the fact that C++ does not require restrict.
238 for ac_kw in __restrict __restrict__ _Restrict restrict; do
239 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
240 [[typedef int * int_ptr;
241 int foo (int_ptr $ac_kw ip) {
248 [ac_cv_c_restrict=$ac_kw])
249 test "$ac_cv_c_restrict" != no && break
252 AH_VERBATIM([restrict],
253 [/* Define to the equivalent of the C99 'restrict' keyword, or to
254 nothing if this is not supported. Do not define if restrict is
255 supported directly. */
257 /* Work around a bug in Sun C++: it does not support _Restrict, even
258 though the corresponding Sun C compiler does, which causes
259 "#define restrict _Restrict" in the previous line. Perhaps some future
260 version of Sun C++ will work with _Restrict; if so, it'll probably
261 define __RESTRICT, just as Sun C does. */
262 #if defined __SUNPRO_CC && !defined __RESTRICT
265 case $ac_cv_c_restrict in
267 no) AC_DEFINE([restrict], []) ;;
268 *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
274 # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
275 # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
276 # macros invoke AC_C_BIGENDIAN with arguments.
277 AC_DEFUN([gl_BIGENDIAN],
282 # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
283 # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
284 # output a spurious "(cached)" mark in the midst of other configure output.
285 # This macro should be used instead of AC_CACHE_VAL when it is not surrounded
286 # by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
287 AC_DEFUN([gl_CACHE_VAL_SILENT],
289 saved_as_echo_n="$as_echo_n"
291 AC_CACHE_VAL([$1], [$2])
292 as_echo_n="$saved_as_echo_n"