1
# gnulib-common.m4 serial 33
2
dnl Copyright (C) 2007-2012 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 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)
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
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__))
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
52
/* The __pure__ attribute was added in gcc 2.96. */
53
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
54
# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
56
# define _GL_ATTRIBUTE_PURE /* empty */
59
/* The __const__ attribute was added in gcc 2.95. */
60
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
61
# define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
63
# define _GL_ATTRIBUTE_CONST /* empty */
66
dnl Preparation for running test programs:
67
dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not
68
dnl to /dev/tty, so they can be redirected to log files. Such diagnostics
69
dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.
71
export LIBC_FATAL_STDERR_
74
# gl_MODULE_INDICATOR_CONDITION
75
# expands to a C preprocessor expression that evaluates to 1 or 0, depending
76
# whether a gnulib module that has been requested shall be considered present
78
m4_define([gl_MODULE_INDICATOR_CONDITION], [1])
80
# gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
81
# sets the shell variable that indicates the presence of the given module to
82
# a C preprocessor expression that will evaluate to 1.
83
AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
85
gl_MODULE_INDICATOR_SET_VARIABLE_AUX(
86
[GNULIB_[]m4_translit([[$1]],
87
[abcdefghijklmnopqrstuvwxyz./-],
88
[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
89
[gl_MODULE_INDICATOR_CONDITION])
92
# gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable])
93
# modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION.
94
# The shell variable's value is a C preprocessor expression that evaluates
96
AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX],
98
m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1],
100
dnl Simplify the expression VALUE || 1 to 1.
103
[gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1],
104
[gl_MODULE_INDICATOR_CONDITION])])
107
# gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition])
108
# modifies the shell variable to include the given condition. The shell
109
# variable's value is a C preprocessor expression that evaluates to 0 or 1.
110
AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR],
112
dnl Simplify the expression 1 || CONDITION to 1.
113
if test "$[]$1" != 1; then
114
dnl Simplify the expression 0 || CONDITION to CONDITION.
115
if test "$[]$1" = 0; then
123
# gl_MODULE_INDICATOR([modulename])
124
# defines a C macro indicating the presence of the given module
125
# in a location where it can be used.
127
# | in lib/ | in tests/ |
128
# --------------------------------------------+---------+-----------+
129
# Module present among main modules: | 1 | 1 |
130
# --------------------------------------------+---------+-----------+
131
# Module present among tests-related modules: | 0 | 1 |
132
# --------------------------------------------+---------+-----------+
133
# Module not present at all: | 0 | 0 |
134
# --------------------------------------------+---------+-----------+
135
AC_DEFUN([gl_MODULE_INDICATOR],
137
AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],
138
[abcdefghijklmnopqrstuvwxyz./-],
139
[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),
140
[gl_MODULE_INDICATOR_CONDITION],
141
[Define to a C preprocessor expression that evaluates to 1 or 0,
142
depending whether the gnulib module $1 shall be considered present.])
145
# gl_MODULE_INDICATOR_FOR_TESTS([modulename])
146
# defines a C macro indicating the presence of the given module
147
# in lib or tests. This is useful to determine whether the module
150
# | in lib/ | in tests/ |
151
# --------------------------------------------+---------+-----------+
152
# Module present among main modules: | 1 | 1 |
153
# --------------------------------------------+---------+-----------+
154
# Module present among tests-related modules: | 1 | 1 |
155
# --------------------------------------------+---------+-----------+
156
# Module not present at all: | 0 | 0 |
157
# --------------------------------------------+---------+-----------+
158
AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],
160
AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],
161
[abcdefghijklmnopqrstuvwxyz./-],
162
[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
163
[Define to 1 when the gnulib module $1 should be tested.])
166
# gl_ASSERT_NO_GNULIB_POSIXCHECK
167
# asserts that there will never be a need to #define GNULIB_POSIXCHECK.
168
# and thereby enables an optimization of configure and config.h.
170
AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
172
dnl Override gl_WARN_ON_USE_PREPARE.
173
dnl But hide this definition from 'aclocal'.
174
AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], [])
177
# gl_ASSERT_NO_GNULIB_TESTS
178
# asserts that there will be no gnulib tests in the scope of the configure.ac
179
# and thereby enables an optimization of config.h.
181
AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
183
dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
184
AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
187
# Test whether <features.h> exists.
188
# Set HAVE_FEATURES_H.
189
AC_DEFUN([gl_FEATURES_H],
191
AC_CHECK_HEADERS_ONCE([features.h])
192
if test $ac_cv_header_features_h = yes; then
197
AC_SUBST([HAVE_FEATURES_H])
201
# is a backport of autoconf-2.59c's m4_foreach_w.
202
# Remove this macro when we can assume autoconf >= 2.60.
203
m4_ifndef([m4_foreach_w],
204
[m4_define([m4_foreach_w],
205
[m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
207
# AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])
208
# ----------------------------------------------------
209
# Backport of autoconf-2.63b's macro.
210
# Remove this macro when we can assume autoconf >= 2.64.
211
m4_ifndef([AS_VAR_IF],
212
[m4_define([AS_VAR_IF],
213
[AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
216
# Modifies the value of the shell variable CC in an attempt to make $CC
217
# understand ISO C99 source code.
218
# This is like AC_PROG_CC_C99, except that
219
# - AC_PROG_CC_C99 did not exist in Autoconf versions < 2.60,
220
# - AC_PROG_CC_C99 does not mix well with AC_PROG_CC_STDC
221
# <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00367.html>,
222
# but many more packages use AC_PROG_CC_STDC than AC_PROG_CC_C99
223
# <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00441.html>.
224
# Remaining problems:
225
# - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options
227
# <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00431.html>.
228
# - AC_PROG_CC_STDC is likely to change now that C11 is an ISO standard.
229
AC_DEFUN([gl_PROG_CC_C99],
231
dnl Change that version number to the minimum Autoconf version that supports
232
dnl mixing AC_PROG_CC_C99 calls with AC_PROG_CC_STDC calls.
233
m4_version_prereq([9.0],
234
[AC_REQUIRE([AC_PROG_CC_C99])],
235
[AC_REQUIRE([AC_PROG_CC_STDC])])
239
# Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler.
240
# The user can set the variables AR, ARFLAGS, RANLIB if he wants to override
242
AC_DEFUN([gl_PROG_AR_RANLIB],
244
dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler
245
dnl as "cc", and GCC as "gcc". They have different object file formats and
246
dnl library formats. In particular, the GNU binutils programs ar, ranlib
247
dnl produce libraries that work only with gcc, not with cc.
248
AC_REQUIRE([AC_PROG_CC])
249
AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler],
251
AC_EGREP_CPP([Amsterdam],
257
[gl_cv_c_amsterdam_compiler=yes],
258
[gl_cv_c_amsterdam_compiler=no])
260
if test -z "$AR"; then
261
if test $gl_cv_c_amsterdam_compiler = yes; then
263
if test -z "$ARFLAGS"; then
267
dnl Use the Automake-documented default values for AR and ARFLAGS,
268
dnl but prefer ${host}-ar over ar (useful for cross-compiling).
269
AC_CHECK_TOOL([AR], [ar], [ar])
270
if test -z "$ARFLAGS"; then
275
if test -z "$ARFLAGS"; then
281
if test -z "$RANLIB"; then
282
if test $gl_cv_c_amsterdam_compiler = yes; then
285
dnl Use the ranlib program if it is available.
293
# is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix
294
# for interoperability with automake-1.9.6 from autoconf-2.62.
295
# Remove this macro when we can assume autoconf >= 2.62 or
296
# autoconf >= 2.60 && automake >= 1.10.
297
m4_ifdef([AC_PROG_MKDIR_P], [
298
dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed.
299
m4_define([AC_PROG_MKDIR_P],
300
m4_defn([AC_PROG_MKDIR_P])[
301
AC_SUBST([MKDIR_P])])], [
302
dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P.
303
AC_DEFUN_ONCE([AC_PROG_MKDIR_P],
304
[AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
306
AC_SUBST([MKDIR_P])])])
309
# This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61,
310
# so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++
312
# This definition can be removed once autoconf >= 2.62 can be assumed.
313
m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]),[2.62]),[-1],[
314
AC_DEFUN([AC_C_RESTRICT],
315
[AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
317
# The order here caters to the fact that C++ does not require restrict.
318
for ac_kw in __restrict __restrict__ _Restrict restrict; do
319
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
320
[[typedef int * int_ptr;
321
int foo (int_ptr $ac_kw ip) {
328
[ac_cv_c_restrict=$ac_kw])
329
test "$ac_cv_c_restrict" != no && break
332
AH_VERBATIM([restrict],
333
[/* Define to the equivalent of the C99 'restrict' keyword, or to
334
nothing if this is not supported. Do not define if restrict is
335
supported directly. */
337
/* Work around a bug in Sun C++: it does not support _Restrict, even
338
though the corresponding Sun C compiler does, which causes
339
"#define restrict _Restrict" in the previous line. Perhaps some future
340
version of Sun C++ will work with _Restrict; if so, it'll probably
341
define __RESTRICT, just as Sun C does. */
342
#if defined __SUNPRO_CC && !defined __RESTRICT
345
case $ac_cv_c_restrict in
347
no) AC_DEFINE([restrict], []) ;;
348
*) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
354
# is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
355
# Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
356
# macros invoke AC_C_BIGENDIAN with arguments.
357
AC_DEFUN([gl_BIGENDIAN],
362
# gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
363
# is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
364
# output a spurious "(cached)" mark in the midst of other configure output.
365
# This macro should be used instead of AC_CACHE_VAL when it is not surrounded
366
# by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
367
AC_DEFUN([gl_CACHE_VAL_SILENT],
369
saved_as_echo_n="$as_echo_n"
371
AC_CACHE_VAL([$1], [$2])
372
as_echo_n="$saved_as_echo_n"
added
removed
m4/gnulib-common.m4
