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282 lines
11 KiB
282 lines
11 KiB
# gnulib-common.m4 serial 26 |
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dnl Copyright (C) 2007-2011 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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|
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# gl_COMMON |
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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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]) |
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AC_DEFUN([gl_COMMON_BODY], [ |
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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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#endif]) |
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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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#else |
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# define _GL_UNUSED |
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#endif |
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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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#else |
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# define _GL_ATTRIBUTE_PURE /* empty */ |
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#endif |
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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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#else |
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# define _GL_ATTRIBUTE_CONST /* empty */ |
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#endif |
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]) |
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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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LIBC_FATAL_STDERR_=1 |
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export LIBC_FATAL_STDERR_ |
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]) |
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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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# or not. |
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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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[ |
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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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]) |
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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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# to 0 or 1. |
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AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX], |
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[ |
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m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1], |
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[ |
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dnl Simplify the expression VALUE || 1 to 1. |
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$1=1 |
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], |
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[gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1], |
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[gl_MODULE_INDICATOR_CONDITION])]) |
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]) |
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# gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition]) |
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# modifies the shell variable to include the given condition. The shell |
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# variable's value is a C preprocessor expression that evaluates to 0 or 1. |
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AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR], |
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[ |
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dnl Simplify the expression 1 || CONDITION to 1. |
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if test "$[]$1" != 1; then |
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dnl Simplify the expression 0 || CONDITION to CONDITION. |
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if test "$[]$1" = 0; then |
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$1=$2 |
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else |
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$1="($[]$1 || $2)" |
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fi |
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fi |
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]) |
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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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# | Value | Value | |
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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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[ |
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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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]) |
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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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# should be tested. |
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# | Value | Value | |
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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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[ |
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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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]) |
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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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# Used by Emacs. |
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AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK], |
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[ |
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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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]) |
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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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# Used by Emacs. |
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AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS], |
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[ |
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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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]) |
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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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[ |
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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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HAVE_FEATURES_H=1 |
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else |
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HAVE_FEATURES_H=0 |
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fi |
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AC_SUBST([HAVE_FEATURES_H]) |
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]) |
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# m4_foreach_w |
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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], [$4])])]) |
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# AC_PROG_MKDIR_P |
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# is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix |
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# for interoperability with automake-1.9.6 from autoconf-2.62. |
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# Remove this macro when we can assume autoconf >= 2.62 or |
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# autoconf >= 2.60 && automake >= 1.10. |
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m4_ifdef([AC_PROG_MKDIR_P], [ |
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dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed. |
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m4_define([AC_PROG_MKDIR_P], |
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m4_defn([AC_PROG_MKDIR_P])[ |
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AC_SUBST([MKDIR_P])])], [ |
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dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P. |
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AC_DEFUN_ONCE([AC_PROG_MKDIR_P], |
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[AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake |
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MKDIR_P='$(mkdir_p)' |
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AC_SUBST([MKDIR_P])])]) |
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# AC_C_RESTRICT |
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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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# works. |
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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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[ac_cv_c_restrict=no |
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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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return ip[0]; |
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}]], |
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[[int s[1]; |
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int * $ac_kw t = s; |
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t[0] = 0; |
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return foo(t)]])], |
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[ac_cv_c_restrict=$ac_kw]) |
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test "$ac_cv_c_restrict" != no && break |
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done |
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]) |
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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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#undef restrict |
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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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# define _Restrict |
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#endif]) |
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case $ac_cv_c_restrict in |
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restrict) ;; |
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no) AC_DEFINE([restrict], []) ;; |
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*) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;; |
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esac |
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]) |
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]) |
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# gl_BIGENDIAN |
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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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[ |
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AC_C_BIGENDIAN |
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]) |
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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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[ |
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saved_as_echo_n="$as_echo_n" |
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as_echo_n=':' |
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AC_CACHE_VAL([$1], [$2]) |
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as_echo_n="$saved_as_echo_n" |
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])
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