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# gnulib-common.m4 serial 32
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dnl Copyright (C) 2007-2012 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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# is expanded unconditionally through gnulib-tool magic.
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AC_DEFUN([gl_COMMON], [
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dnl Use AC_REQUIRE here, so that the code is expanded once only.
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AC_REQUIRE([gl_00GNULIB])
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AC_REQUIRE([gl_COMMON_BODY])
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AC_DEFUN([gl_COMMON_BODY], [
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AH_VERBATIM([_Noreturn],
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[/* The _Noreturn keyword of C11. */
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# if (3 <= __GNUC__ || (__GNUC__ == 2 && 8 <= __GNUC_MINOR__) \
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|| 0x5110 <= __SUNPRO_C)
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# define _Noreturn __attribute__ ((__noreturn__))
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# elif defined _MSC_VER && 1200 <= _MSC_VER
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# define _Noreturn __declspec (noreturn)
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AH_VERBATIM([isoc99_inline],
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[/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports
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the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of
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earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.
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__APPLE__ && __MACH__ test for MacOS X.
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__APPLE_CC__ tests for the Apple compiler and its version.
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__STDC_VERSION__ tests for the C99 mode. */
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#if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
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# define __GNUC_STDC_INLINE__ 1
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AH_VERBATIM([unused_parameter],
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[/* Define as a marker that can be attached to declarations that might not
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be used. This helps to reduce warnings, such as from
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GCC -Wunused-parameter. */
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#if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
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# define _GL_UNUSED __attribute__ ((__unused__))
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/* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name
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is a misnomer outside of parameter lists. */
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#define _UNUSED_PARAMETER_ _GL_UNUSED
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/* The __pure__ attribute was added in gcc 2.96. */
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#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
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# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
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# define _GL_ATTRIBUTE_PURE /* empty */
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/* The __const__ attribute was added in gcc 2.95. */
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#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
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# define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
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# define _GL_ATTRIBUTE_CONST /* empty */
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dnl Preparation for running test programs:
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dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not
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dnl to /dev/tty, so they can be redirected to log files. Such diagnostics
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dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.
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export LIBC_FATAL_STDERR_
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# gl_MODULE_INDICATOR_CONDITION
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# expands to a C preprocessor expression that evaluates to 1 or 0, depending
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# whether a gnulib module that has been requested shall be considered present
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m4_define([gl_MODULE_INDICATOR_CONDITION], [1])
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# gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
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# sets the shell variable that indicates the presence of the given module to
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# a C preprocessor expression that will evaluate to 1.
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AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
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gl_MODULE_INDICATOR_SET_VARIABLE_AUX(
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[GNULIB_[]m4_translit([[$1]],
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[abcdefghijklmnopqrstuvwxyz./-],
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[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
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[gl_MODULE_INDICATOR_CONDITION])
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# gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable])
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# modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION.
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# The shell variable's value is a C preprocessor expression that evaluates
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AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX],
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m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1],
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dnl Simplify the expression VALUE || 1 to 1.
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[gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1],
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[gl_MODULE_INDICATOR_CONDITION])])
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# gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition])
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# modifies the shell variable to include the given condition. The shell
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# variable's value is a C preprocessor expression that evaluates to 0 or 1.
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AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR],
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dnl Simplify the expression 1 || CONDITION to 1.
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if test "$[]$1" != 1; then
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dnl Simplify the expression 0 || CONDITION to CONDITION.
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if test "$[]$1" = 0; then
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# gl_MODULE_INDICATOR([modulename])
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# defines a C macro indicating the presence of the given module
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# in a location where it can be used.
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# | in lib/ | in tests/ |
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# --------------------------------------------+---------+-----------+
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# Module present among main modules: | 1 | 1 |
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# --------------------------------------------+---------+-----------+
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# Module present among tests-related modules: | 0 | 1 |
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# --------------------------------------------+---------+-----------+
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# Module not present at all: | 0 | 0 |
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# --------------------------------------------+---------+-----------+
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AC_DEFUN([gl_MODULE_INDICATOR],
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AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],
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[abcdefghijklmnopqrstuvwxyz./-],
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[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),
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[gl_MODULE_INDICATOR_CONDITION],
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[Define to a C preprocessor expression that evaluates to 1 or 0,
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depending whether the gnulib module $1 shall be considered present.])
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# gl_MODULE_INDICATOR_FOR_TESTS([modulename])
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# defines a C macro indicating the presence of the given module
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# in lib or tests. This is useful to determine whether the module
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# | in lib/ | in tests/ |
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# --------------------------------------------+---------+-----------+
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# Module present among main modules: | 1 | 1 |
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# --------------------------------------------+---------+-----------+
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# Module present among tests-related modules: | 1 | 1 |
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# --------------------------------------------+---------+-----------+
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# Module not present at all: | 0 | 0 |
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# --------------------------------------------+---------+-----------+
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AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],
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AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],
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[abcdefghijklmnopqrstuvwxyz./-],
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[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
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[Define to 1 when the gnulib module $1 should be tested.])
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# gl_ASSERT_NO_GNULIB_POSIXCHECK
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# asserts that there will never be a need to #define GNULIB_POSIXCHECK.
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# and thereby enables an optimization of configure and config.h.
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AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
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dnl Override gl_WARN_ON_USE_PREPARE.
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dnl But hide this definition from 'aclocal'.
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AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], [])
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# gl_ASSERT_NO_GNULIB_TESTS
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# asserts that there will be no gnulib tests in the scope of the configure.ac
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# and thereby enables an optimization of config.h.
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AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
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dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
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AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
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# Test whether <features.h> exists.
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# Set HAVE_FEATURES_H.
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AC_DEFUN([gl_FEATURES_H],
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AC_CHECK_HEADERS_ONCE([features.h])
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if test $ac_cv_header_features_h = yes; then
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AC_SUBST([HAVE_FEATURES_H])
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# is a backport of autoconf-2.59c's m4_foreach_w.
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# Remove this macro when we can assume autoconf >= 2.60.
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m4_ifndef([m4_foreach_w],
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[m4_define([m4_foreach_w],
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[m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
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# AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])
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# ----------------------------------------------------
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# Backport of autoconf-2.63b's macro.
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# Remove this macro when we can assume autoconf >= 2.64.
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m4_ifndef([AS_VAR_IF],
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[m4_define([AS_VAR_IF],
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[AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
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# Modifies the value of the shell variable CC in an attempt to make $CC
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# understand ISO C99 source code.
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# This is like AC_PROG_CC_C99, except that
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# - AC_PROG_CC_C99 did not exist in Autoconf versions < 2.60,
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# - AC_PROG_CC_C99 does not mix well with AC_PROG_CC_STDC
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# <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00367.html>,
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# but many more packages use AC_PROG_CC_STDC than AC_PROG_CC_C99
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# <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00441.html>.
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# Remaining problems:
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# - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options
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# <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00431.html>.
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# - AC_PROG_CC_STDC is likely to change now that C11 is an ISO standard.
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AC_DEFUN([gl_PROG_CC_C99],
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dnl Change that version number to the minimum Autoconf version that supports
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dnl mixing AC_PROG_CC_C99 calls with AC_PROG_CC_STDC calls.
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m4_version_prereq([9.0],
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[AC_REQUIRE([AC_PROG_CC_C99])],
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[AC_REQUIRE([AC_PROG_CC_STDC])])
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# Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler.
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# The user can set the variables AR, ARFLAGS, RANLIB if he wants to override
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AC_DEFUN([gl_PROG_AR_RANLIB],
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dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler
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dnl as "cc", and GCC as "gcc". They have different object file formats and
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dnl library formats. In particular, the GNU binutils programs ar, ranlib
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dnl produce libraries that work only with gcc, not with cc.
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AC_REQUIRE([AC_PROG_CC])
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AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler],
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AC_EGREP_CPP([Amsterdam],
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[gl_cv_c_amsterdam_compiler=yes],
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[gl_cv_c_amsterdam_compiler=no])
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if test -z "$AR"; then
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if test $gl_cv_c_amsterdam_compiler = yes; then
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if test -z "$ARFLAGS"; then
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dnl Use the Automake-documented default values for AR and ARFLAGS,
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dnl but prefer ${host}-ar over ar (useful for cross-compiling).
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AC_CHECK_TOOL([AR], [ar], [ar])
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if test -z "$ARFLAGS"; then
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if test -z "$ARFLAGS"; then
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if test -z "$RANLIB"; then
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if test $gl_cv_c_amsterdam_compiler = yes; then
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dnl Use the ranlib program if it is available.
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# is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix
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# for interoperability with automake-1.9.6 from autoconf-2.62.
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# Remove this macro when we can assume autoconf >= 2.62 or
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# autoconf >= 2.60 && automake >= 1.10.
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m4_ifdef([AC_PROG_MKDIR_P], [
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dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed.
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m4_define([AC_PROG_MKDIR_P],
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m4_defn([AC_PROG_MKDIR_P])[
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AC_SUBST([MKDIR_P])])], [
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dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P.
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AC_DEFUN_ONCE([AC_PROG_MKDIR_P],
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[AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
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AC_SUBST([MKDIR_P])])])
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# This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61,
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# so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++
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# This definition can be removed once autoconf >= 2.62 can be assumed.
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m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]),[2.62]),[-1],[
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AC_DEFUN([AC_C_RESTRICT],
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[AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
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# The order here caters to the fact that C++ does not require restrict.
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for ac_kw in __restrict __restrict__ _Restrict restrict; do
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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[[typedef int * int_ptr;
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int foo (int_ptr $ac_kw ip) {
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[ac_cv_c_restrict=$ac_kw])
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test "$ac_cv_c_restrict" != no && break
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AH_VERBATIM([restrict],
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[/* Define to the equivalent of the C99 'restrict' keyword, or to
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nothing if this is not supported. Do not define if restrict is
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supported directly. */
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/* Work around a bug in Sun C++: it does not support _Restrict, even
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though the corresponding Sun C compiler does, which causes
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"#define restrict _Restrict" in the previous line. Perhaps some future
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version of Sun C++ will work with _Restrict; if so, it'll probably
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define __RESTRICT, just as Sun C does. */
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#if defined __SUNPRO_CC && !defined __RESTRICT
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case $ac_cv_c_restrict in
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no) AC_DEFINE([restrict], []) ;;
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*) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
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# is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
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# Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
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# macros invoke AC_C_BIGENDIAN with arguments.
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AC_DEFUN([gl_BIGENDIAN],
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# gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
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# is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
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# output a spurious "(cached)" mark in the midst of other configure output.
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# This macro should be used instead of AC_CACHE_VAL when it is not surrounded
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# by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
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AC_DEFUN([gl_CACHE_VAL_SILENT],
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saved_as_echo_n="$as_echo_n"
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AC_CACHE_VAL([$1], [$2])
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as_echo_n="$saved_as_echo_n"
added
removed
m4/gnulib-common.m4
