1# gnulib-common.m4 serial 11
2dnl Copyright (C) 2007-2009 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7# gl_COMMON
8# is expanded unconditionally through gnulib-tool magic.
9AC_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])
13])
14AC_DEFUN([gl_COMMON_BODY], [
15  AH_VERBATIM([isoc99_inline],
16[/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports
17   the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of
18   earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.
19   __APPLE__ && __MACH__ test for MacOS X.
20   __APPLE_CC__ tests for the Apple compiler and its version.
21   __STDC_VERSION__ tests for the C99 mode.  */
22#if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
23# define __GNUC_STDC_INLINE__ 1
24#endif])
25  AH_VERBATIM([unused_parameter],
26[/* Define as a marker that can be attached to function parameter declarations
27   for parameters that are not used.  This helps to reduce warnings, such as
28   from GCC -Wunused-parameter.  */
29#if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
30# define _UNUSED_PARAMETER_ __attribute__ ((__unused__))
31#else
32# define _UNUSED_PARAMETER_
33#endif
34])
35])
36
37# gl_MODULE_INDICATOR([modulename])
38# defines a C macro indicating the presence of the given module.
39AC_DEFUN([gl_MODULE_INDICATOR],
40[
41  AC_DEFINE([GNULIB_]translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
42    [Define to 1 when using the gnulib module ]$1[.])
43])
44
45# m4_foreach_w
46# is a backport of autoconf-2.59c's m4_foreach_w.
47# Remove this macro when we can assume autoconf >= 2.60.
48m4_ifndef([m4_foreach_w],
49  [m4_define([m4_foreach_w],
50    [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
51
52# AC_PROG_MKDIR_P
53# is a backport of autoconf-2.60's AC_PROG_MKDIR_P.
54# Remove this macro when we can assume autoconf >= 2.60.
55m4_ifdef([AC_PROG_MKDIR_P], [], [
56  AC_DEFUN_ONCE([AC_PROG_MKDIR_P],
57    [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
58     MKDIR_P='$(mkdir_p)'
59     AC_SUBST([MKDIR_P])])])
60
61# AC_C_RESTRICT
62# This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61,
63# so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++
64# works.
65# This definition can be removed once autoconf >= 2.62 can be assumed.
66AC_DEFUN([AC_C_RESTRICT],
67[AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
68  [ac_cv_c_restrict=no
69   # The order here caters to the fact that C++ does not require restrict.
70   for ac_kw in __restrict __restrict__ _Restrict restrict; do
71     AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
72      [[typedef int * int_ptr;
73	int foo (int_ptr $ac_kw ip) {
74	return ip[0];
75       }]],
76      [[int s[1];
77	int * $ac_kw t = s;
78	t[0] = 0;
79	return foo(t)]])],
80      [ac_cv_c_restrict=$ac_kw])
81     test "$ac_cv_c_restrict" != no && break
82   done
83  ])
84 AH_VERBATIM([restrict],
85[/* Define to the equivalent of the C99 'restrict' keyword, or to
86   nothing if this is not supported.  Do not define if restrict is
87   supported directly.  */
88#undef restrict
89/* Work around a bug in Sun C++: it does not support _Restrict, even
90   though the corresponding Sun C compiler does, which causes
91   "#define restrict _Restrict" in the previous line.  Perhaps some future
92   version of Sun C++ will work with _Restrict; if so, it'll probably
93   define __RESTRICT, just as Sun C does.  */
94#if defined __SUNPRO_CC && !defined __RESTRICT
95# define _Restrict
96#endif])
97 case $ac_cv_c_restrict in
98   restrict) ;;
99   no) AC_DEFINE([restrict], []) ;;
100   *)  AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
101 esac
102])
103
104# gl_BIGENDIAN
105# is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
106# Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
107# macros invoke AC_C_BIGENDIAN with arguments.
108AC_DEFUN([gl_BIGENDIAN],
109[
110  AC_C_BIGENDIAN
111])
112
113# gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
114# is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
115# output a spurious "(cached)" mark in the midst of other configure output.
116# This macro should be used instead of AC_CACHE_VAL when it is not surrounded
117# by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
118AC_DEFUN([gl_CACHE_VAL_SILENT],
119[
120  saved_as_echo_n="$as_echo_n"
121  as_echo_n=':'
122  AC_CACHE_VAL([$1], [$2])
123  as_echo_n="$saved_as_echo_n"
124])
125