gnulib-common.m4

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# gnulib-common.m4 serial 3
dnl Copyright (C) 2007 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

# gl_MODULE_INDICATOR([modulename])
# defines a C macro indicating the presence of the given module.
AC_DEFUN([gl_MODULE_INDICATOR],
[
  AC_DEFINE([GNULIB_]translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
    [Define to 1 when using the gnulib module ]$1[.])
])

# AC_PROG_MKDIR_P
# is a backport of autoconf-2.60's AC_PROG_MKDIR_P.
# Remove this macro when we can assume autoconf >= 2.60.
m4_ifdef([AC_PROG_MKDIR_P], [], [
  AC_DEFUN([AC_PROG_MKDIR_P],
    [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
     MKDIR_P='$(mkdir_p)'
     AC_SUBST([MKDIR_P])])])

# AC_C_RESTRICT
# This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61,
# so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++
# works.
# This definition can be removed once autoconf >= 2.62 can be assumed.
AC_DEFUN([AC_C_RESTRICT],
[AC_CACHE_CHECK([for C/C++ restrict keyword], ac_cv_c_restrict,
  [ac_cv_c_restrict=no
   # The order here caters to the fact that C++ does not require restrict.
   for ac_kw in __restrict __restrict__ _Restrict restrict; do
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
      [[typedef int * int_ptr;
	int foo (int_ptr $ac_kw ip) {
	return ip[0];
       }]],
      [[int s[1];
	int * $ac_kw t = s;
	t[0] = 0;
	return foo(t)]])],
      [ac_cv_c_restrict=$ac_kw])
     test "$ac_cv_c_restrict" != no && break
   done
  ])
 AH_VERBATIM([restrict],
[/* Define to the equivalent of the C99 'restrict' keyword, or to
   nothing if this is not supported.  Do not define if restrict is
   supported directly.  */
#undef restrict
/* Work around a bug in Sun C++: it does not support _Restrict, even
   though the corresponding Sun C compiler does, which causes
   "#define restrict _Restrict" in the previous line.  Perhaps some future
   version of Sun C++ will work with _Restrict; if so, it'll probably
   define __RESTRICT, just as Sun C does.  */
#if defined __SUNPRO_CC && !defined __RESTRICT
# define _Restrict
#endif])
 case $ac_cv_c_restrict in
   restrict) ;;
   no) AC_DEFINE([restrict], []) ;;
   *)  AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
 esac
])