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1 | # gnulib-common.m4 serial 21 |
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. | |
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([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 | |
24 | #endif]) | |
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__)) | |
31 | #else | |
32 | # define _GL_UNUSED | |
33 | #endif | |
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 | |
37 | ]) | |
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. | |
42 | LIBC_FATAL_STDERR_=1 | |
43 | export LIBC_FATAL_STDERR_ | |
44 | ]) | |
45 | ||
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 | |
49 | # or not. | |
50 | AC_DEFUN([gl_MODULE_INDICATOR_CONDITION], [1]) | |
51 | ||
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], | |
56 | [ | |
57 | GNULIB_[]m4_translit([[$1]], | |
58 | [abcdefghijklmnopqrstuvwxyz./-], | |
59 | [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=gl_MODULE_INDICATOR_CONDITION | |
60 | ]) | |
61 | ||
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. | |
65 | # | Value | Value | | |
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], | |
75 | [ | |
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.]) | |
82 | ]) | |
83 | ||
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 | |
87 | # should be tested. | |
88 | # | Value | Value | | |
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], | |
98 | [ | |
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.]) | |
103 | ]) | |
104 | ||
105 | # Test whether <features.h> exists. | |
106 | # Set HAVE_FEATURES_H. | |
107 | AC_DEFUN([gl_FEATURES_H], | |
108 | [ | |
109 | AC_CHECK_HEADERS_ONCE([features.h]) | |
110 | if test $ac_cv_header_features_h = yes; then | |
111 | HAVE_FEATURES_H=1 | |
112 | else | |
113 | HAVE_FEATURES_H=0 | |
114 | fi | |
115 | AC_SUBST([HAVE_FEATURES_H]) | |
116 | ]) | |
117 | ||
118 | # m4_foreach_w | |
119 | # is a backport of autoconf-2.59c's m4_foreach_w. | |
120 | # Remove this macro when we can assume autoconf >= 2.60. | |
121 | m4_ifndef([m4_foreach_w], | |
122 | [m4_define([m4_foreach_w], | |
123 | [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])]) | |
124 | ||
125 | # AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH]) | |
126 | # ---------------------------------------------------- | |
127 | # Backport of autoconf-2.63b's macro. | |
128 | # Remove this macro when we can assume autoconf >= 2.64. | |
129 | m4_ifndef([AS_VAR_IF], | |
130 | [m4_define([AS_VAR_IF], | |
131 | [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])]) | |
132 | ||
133 | # AC_PROG_MKDIR_P | |
134 | # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix | |
135 | # for interoperability with automake-1.9.6 from autoconf-2.62. | |
136 | # Remove this macro when we can assume autoconf >= 2.62 or | |
137 | # autoconf >= 2.60 && automake >= 1.10. | |
138 | m4_ifdef([AC_PROG_MKDIR_P], [ | |
139 | dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed. | |
140 | m4_define([AC_PROG_MKDIR_P], | |
141 | m4_defn([AC_PROG_MKDIR_P])[ | |
142 | AC_SUBST([MKDIR_P])])], [ | |
143 | dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P. | |
144 | AC_DEFUN_ONCE([AC_PROG_MKDIR_P], | |
145 | [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake | |
146 | MKDIR_P='$(mkdir_p)' | |
147 | AC_SUBST([MKDIR_P])])]) | |
148 | ||
149 | # AC_C_RESTRICT | |
150 | # This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61, | |
151 | # so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++ | |
152 | # works. | |
153 | # This definition can be removed once autoconf >= 2.62 can be assumed. | |
154 | m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]),[2.62]),[-1],[ | |
155 | AC_DEFUN([AC_C_RESTRICT], | |
156 | [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict], | |
157 | [ac_cv_c_restrict=no | |
158 | # The order here caters to the fact that C++ does not require restrict. | |
159 | for ac_kw in __restrict __restrict__ _Restrict restrict; do | |
160 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM( | |
161 | [[typedef int * int_ptr; | |
162 | int foo (int_ptr $ac_kw ip) { | |
163 | return ip[0]; | |
164 | }]], | |
165 | [[int s[1]; | |
166 | int * $ac_kw t = s; | |
167 | t[0] = 0; | |
168 | return foo(t)]])], | |
169 | [ac_cv_c_restrict=$ac_kw]) | |
170 | test "$ac_cv_c_restrict" != no && break | |
171 | done | |
172 | ]) | |
173 | AH_VERBATIM([restrict], | |
174 | [/* Define to the equivalent of the C99 'restrict' keyword, or to | |
175 | nothing if this is not supported. Do not define if restrict is | |
176 | supported directly. */ | |
177 | #undef restrict | |
178 | /* Work around a bug in Sun C++: it does not support _Restrict, even | |
179 | though the corresponding Sun C compiler does, which causes | |
180 | "#define restrict _Restrict" in the previous line. Perhaps some future | |
181 | version of Sun C++ will work with _Restrict; if so, it'll probably | |
182 | define __RESTRICT, just as Sun C does. */ | |
183 | #if defined __SUNPRO_CC && !defined __RESTRICT | |
184 | # define _Restrict | |
185 | #endif]) | |
186 | case $ac_cv_c_restrict in | |
187 | restrict) ;; | |
188 | no) AC_DEFINE([restrict], []) ;; | |
189 | *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;; | |
190 | esac | |
191 | ]) | |
192 | ]) | |
193 | ||
194 | # gl_BIGENDIAN | |
195 | # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd. | |
196 | # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some | |
197 | # macros invoke AC_C_BIGENDIAN with arguments. | |
198 | AC_DEFUN([gl_BIGENDIAN], | |
199 | [ | |
200 | AC_C_BIGENDIAN | |
201 | ]) | |
202 | ||
203 | # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it) | |
204 | # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not | |
205 | # output a spurious "(cached)" mark in the midst of other configure output. | |
206 | # This macro should be used instead of AC_CACHE_VAL when it is not surrounded | |
207 | # by an AC_MSG_CHECKING/AC_MSG_RESULT pair. | |
208 | AC_DEFUN([gl_CACHE_VAL_SILENT], | |
209 | [ | |
210 | saved_as_echo_n="$as_echo_n" | |
211 | as_echo_n=':' | |
212 | AC_CACHE_VAL([$1], [$2]) | |
213 | as_echo_n="$saved_as_echo_n" | |
214 | ]) |