2008-04-15 02:05:12 +08:00
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# gnulib-common.m4 serial 3
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2010-01-01 15:32:07 +08:00
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dnl Copyright (C) 2007, 2009, 2010 Free Software Foundation, Inc.
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2008-04-15 02:05:12 +08:00
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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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# gl_MODULE_INDICATOR([modulename])
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# defines a C macro indicating the presence of the given module.
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AC_DEFUN([gl_MODULE_INDICATOR],
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[
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AC_DEFINE([GNULIB_]translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
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[Define to 1 when using the gnulib module ]$1[.])
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])
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# AC_PROG_MKDIR_P
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# is a backport of autoconf-2.60's AC_PROG_MKDIR_P.
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# Remove this macro when we can assume autoconf >= 2.60.
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m4_ifdef([AC_PROG_MKDIR_P], [], [
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AC_DEFUN([AC_PROG_MKDIR_P],
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[AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
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MKDIR_P='$(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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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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