1 # gnulib-common.m4 serial 23
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([isoc99_inline],
16 [/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports
17 the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of
18 earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.
19 __APPLE__ && __MACH__ test for MacOS X.
20 __APPLE_CC__ tests for the Apple compiler and its version.
21 __STDC_VERSION__ tests for the C99 mode. */
22 #if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
23 # define __GNUC_STDC_INLINE__ 1
25 AH_VERBATIM([unused_parameter],
26 [/* Define as a marker that can be attached to declarations that might not
27 be used. This helps to reduce warnings, such as from
28 GCC -Wunused-parameter. */
29 #if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
30 # define _GL_UNUSED __attribute__ ((__unused__))
34 /* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name
35 is a misnomer outside of parameter lists. */
36 #define _UNUSED_PARAMETER_ _GL_UNUSED
38 dnl Preparation for running test programs:
39 dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not
40 dnl to /dev/tty, so they can be redirected to log files. Such diagnostics
41 dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.
43 export LIBC_FATAL_STDERR_
46 # gl_MODULE_INDICATOR_CONDITION
47 # expands to a C preprocessor expression that evaluates to 1 or 0, depending
48 # whether a gnulib module that has been requested shall be considered present
50 AC_DEFUN([gl_MODULE_INDICATOR_CONDITION], [1])
52 # gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
53 # sets the shell variable that indicates the presence of the given module to
54 # a C preprocessor expression that will evaluate to 1.
55 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
57 GNULIB_[]m4_translit([[$1]],
58 [abcdefghijklmnopqrstuvwxyz./-],
59 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=gl_MODULE_INDICATOR_CONDITION
62 # gl_MODULE_INDICATOR([modulename])
63 # defines a C macro indicating the presence of the given module
64 # in a location where it can be used.
66 # | in lib/ | in tests/ |
67 # --------------------------------------------+---------+-----------+
68 # Module present among main modules: | 1 | 1 |
69 # --------------------------------------------+---------+-----------+
70 # Module present among tests-related modules: | 0 | 1 |
71 # --------------------------------------------+---------+-----------+
72 # Module not present at all: | 0 | 0 |
73 # --------------------------------------------+---------+-----------+
74 AC_DEFUN([gl_MODULE_INDICATOR],
76 AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],
77 [abcdefghijklmnopqrstuvwxyz./-],
78 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),
79 [gl_MODULE_INDICATOR_CONDITION],
80 [Define to a C preprocessor expression that evaluates to 1 or 0,
81 depending whether the gnulib module $1 shall be considered present.])
84 # gl_MODULE_INDICATOR_FOR_TESTS([modulename])
85 # defines a C macro indicating the presence of the given module
86 # in lib or tests. This is useful to determine whether the module
89 # | in lib/ | in tests/ |
90 # --------------------------------------------+---------+-----------+
91 # Module present among main modules: | 1 | 1 |
92 # --------------------------------------------+---------+-----------+
93 # Module present among tests-related modules: | 1 | 1 |
94 # --------------------------------------------+---------+-----------+
95 # Module not present at all: | 0 | 0 |
96 # --------------------------------------------+---------+-----------+
97 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],
99 AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],
100 [abcdefghijklmnopqrstuvwxyz./-],
101 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
102 [Define to 1 when the gnulib module $1 should be tested.])
105 # gl_ASSERT_NO_GNULIB_POSIXCHECK
106 # asserts that there will never be a need to #define GNULIB_POSIXCHECK.
107 # and thereby enables an optimization of configure and config.h.
109 AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
111 dnl Override gl_WARN_ON_USE_PREPARE.
112 AC_DEFUN([gl_WARN_ON_USE_PREPARE], [])
115 # gl_ASSERT_NO_GNULIB_TESTS
116 # asserts that there will be no gnulib tests in the scope of the configure.ac
117 # and thereby enables an optimization of config.h.
119 AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
121 dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
122 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
125 # Test whether <features.h> exists.
126 # Set HAVE_FEATURES_H.
127 AC_DEFUN([gl_FEATURES_H],
129 AC_CHECK_HEADERS_ONCE([features.h])
130 if test $ac_cv_header_features_h = yes; then
135 AC_SUBST([HAVE_FEATURES_H])
139 # is a backport of autoconf-2.59c's m4_foreach_w.
140 # Remove this macro when we can assume autoconf >= 2.60.
141 m4_ifndef([m4_foreach_w],
142 [m4_define([m4_foreach_w],
143 [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
145 # AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])
146 # ----------------------------------------------------
147 # Backport of autoconf-2.63b's macro.
148 # Remove this macro when we can assume autoconf >= 2.64.
149 m4_ifndef([AS_VAR_IF],
150 [m4_define([AS_VAR_IF],
151 [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
154 # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix
155 # for interoperability with automake-1.9.6 from autoconf-2.62.
156 # Remove this macro when we can assume autoconf >= 2.62 or
157 # autoconf >= 2.60 && automake >= 1.10.
158 m4_ifdef([AC_PROG_MKDIR_P], [
159 dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed.
160 m4_define([AC_PROG_MKDIR_P],
161 m4_defn([AC_PROG_MKDIR_P])[
162 AC_SUBST([MKDIR_P])])], [
163 dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P.
164 AC_DEFUN_ONCE([AC_PROG_MKDIR_P],
165 [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
167 AC_SUBST([MKDIR_P])])])
170 # This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61,
171 # so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++
173 # This definition can be removed once autoconf >= 2.62 can be assumed.
174 m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]),[2.62]),[-1],[
175 AC_DEFUN([AC_C_RESTRICT],
176 [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
178 # The order here caters to the fact that C++ does not require restrict.
179 for ac_kw in __restrict __restrict__ _Restrict restrict; do
180 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
181 [[typedef int * int_ptr;
182 int foo (int_ptr $ac_kw ip) {
189 [ac_cv_c_restrict=$ac_kw])
190 test "$ac_cv_c_restrict" != no && break
193 AH_VERBATIM([restrict],
194 [/* Define to the equivalent of the C99 'restrict' keyword, or to
195 nothing if this is not supported. Do not define if restrict is
196 supported directly. */
198 /* Work around a bug in Sun C++: it does not support _Restrict, even
199 though the corresponding Sun C compiler does, which causes
200 "#define restrict _Restrict" in the previous line. Perhaps some future
201 version of Sun C++ will work with _Restrict; if so, it'll probably
202 define __RESTRICT, just as Sun C does. */
203 #if defined __SUNPRO_CC && !defined __RESTRICT
206 case $ac_cv_c_restrict in
208 no) AC_DEFINE([restrict], []) ;;
209 *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
215 # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
216 # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
217 # macros invoke AC_C_BIGENDIAN with arguments.
218 AC_DEFUN([gl_BIGENDIAN],
223 # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
224 # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
225 # output a spurious "(cached)" mark in the midst of other configure output.
226 # This macro should be used instead of AC_CACHE_VAL when it is not surrounded
227 # by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
228 AC_DEFUN([gl_CACHE_VAL_SILENT],
230 saved_as_echo_n="$as_echo_n"
232 AC_CACHE_VAL([$1], [$2])
233 as_echo_n="$saved_as_echo_n"