1# gnulib-common.m4 serial 20
2dnl Copyright (C) 2007-2010 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 declarations that might not
27    be used.  This helps to reduce warnings, such as from
28    GCC -Wunused-parameter.  */
29#if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
30# define _GL_UNUSED __attribute__ ((__unused__))
31#else
32# define _GL_UNUSED
33#endif
34/* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name
35   is a misnomer outside of parameter lists.  */
36#define _UNUSED_PARAMETER_ _GL_UNUSED
37])
38  dnl Preparation for running test programs:
39  dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not
40  dnl to /dev/tty, so they can be redirected to log files.  Such diagnostics
41  dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.
42  LIBC_FATAL_STDERR_=1
43  export LIBC_FATAL_STDERR_
44])
45
46# gl_MODULE_INDICATOR_CONDITION
47# expands to a C preprocessor expression that evaluates to 1 or 0, depending
48# whether a gnulib module that has been requested shall be considered present
49# or not.
50AC_DEFUN([gl_MODULE_INDICATOR_CONDITION], [1])
51
52# gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
53# sets the shell variable that indicates the presence of the given module to
54# a C preprocessor expression that will evaluate to 1.
55AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
56[
57  GNULIB_[]m4_translit([[$1]],
58    [abcdefghijklmnopqrstuvwxyz./-],
59    [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=gl_MODULE_INDICATOR_CONDITION
60])
61
62# gl_MODULE_INDICATOR([modulename])
63# defines a C macro indicating the presence of the given module
64# in a location where it can be used.
65#                                             |  Value  |   Value   |
66#                                             | in lib/ | in tests/ |
67# --------------------------------------------+---------+-----------+
68# Module present among main modules:          |    1    |     1     |
69# --------------------------------------------+---------+-----------+
70# Module present among tests-related modules: |    0    |     1     |
71# --------------------------------------------+---------+-----------+
72# Module not present at all:                  |    0    |     0     |
73# --------------------------------------------+---------+-----------+
74AC_DEFUN([gl_MODULE_INDICATOR],
75[
76  AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],
77      [abcdefghijklmnopqrstuvwxyz./-],
78      [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),
79    [gl_MODULE_INDICATOR_CONDITION],
80    [Define to a C preprocessor expression that evaluates to 1 or 0,
81     depending whether the gnulib module $1 shall be considered present.])
82])
83
84# gl_MODULE_INDICATOR_FOR_TESTS([modulename])
85# defines a C macro indicating the presence of the given module
86# in lib or tests. This is useful to determine whether the module
87# should be tested.
88#                                             |  Value  |   Value   |
89#                                             | in lib/ | in tests/ |
90# --------------------------------------------+---------+-----------+
91# Module present among main modules:          |    1    |     1     |
92# --------------------------------------------+---------+-----------+
93# Module present among tests-related modules: |    1    |     1     |
94# --------------------------------------------+---------+-----------+
95# Module not present at all:                  |    0    |     0     |
96# --------------------------------------------+---------+-----------+
97AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],
98[
99  AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],
100      [abcdefghijklmnopqrstuvwxyz./-],
101      [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
102    [Define to 1 when the gnulib module $1 should be tested.])
103])
104
105# m4_foreach_w
106# is a backport of autoconf-2.59c's m4_foreach_w.
107# Remove this macro when we can assume autoconf >= 2.60.
108m4_ifndef([m4_foreach_w],
109  [m4_define([m4_foreach_w],
110    [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
111
112# AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])
113# ----------------------------------------------------
114# Backport of autoconf-2.63b's macro.
115# Remove this macro when we can assume autoconf >= 2.64.
116m4_ifndef([AS_VAR_IF],
117[m4_define([AS_VAR_IF],
118[AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
119
120# AC_PROG_MKDIR_P
121# is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix
122# for interoperability with automake-1.9.6 from autoconf-2.62.
123# Remove this macro when we can assume autoconf >= 2.62 or
124# autoconf >= 2.60 && automake >= 1.10.
125m4_ifdef([AC_PROG_MKDIR_P], [
126  dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed.
127  m4_define([AC_PROG_MKDIR_P],
128    m4_defn([AC_PROG_MKDIR_P])[
129    AC_SUBST([MKDIR_P])])], [
130  dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P.
131  AC_DEFUN_ONCE([AC_PROG_MKDIR_P],
132    [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
133     MKDIR_P='$(mkdir_p)'
134     AC_SUBST([MKDIR_P])])])
135
136# AC_C_RESTRICT
137# This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61,
138# so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++
139# works.
140# This definition can be removed once autoconf >= 2.62 can be assumed.
141m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]),[2.62]),[-1],[
142AC_DEFUN([AC_C_RESTRICT],
143[AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
144  [ac_cv_c_restrict=no
145   # The order here caters to the fact that C++ does not require restrict.
146   for ac_kw in __restrict __restrict__ _Restrict restrict; do
147     AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
148      [[typedef int * int_ptr;
149        int foo (int_ptr $ac_kw ip) {
150        return ip[0];
151       }]],
152      [[int s[1];
153        int * $ac_kw t = s;
154        t[0] = 0;
155        return foo(t)]])],
156      [ac_cv_c_restrict=$ac_kw])
157     test "$ac_cv_c_restrict" != no && break
158   done
159  ])
160 AH_VERBATIM([restrict],
161[/* Define to the equivalent of the C99 'restrict' keyword, or to
162   nothing if this is not supported.  Do not define if restrict is
163   supported directly.  */
164#undef restrict
165/* Work around a bug in Sun C++: it does not support _Restrict, even
166   though the corresponding Sun C compiler does, which causes
167   "#define restrict _Restrict" in the previous line.  Perhaps some future
168   version of Sun C++ will work with _Restrict; if so, it'll probably
169   define __RESTRICT, just as Sun C does.  */
170#if defined __SUNPRO_CC && !defined __RESTRICT
171# define _Restrict
172#endif])
173 case $ac_cv_c_restrict in
174   restrict) ;;
175   no) AC_DEFINE([restrict], []) ;;
176   *)  AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
177 esac
178])
179])
180
181# gl_BIGENDIAN
182# is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
183# Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
184# macros invoke AC_C_BIGENDIAN with arguments.
185AC_DEFUN([gl_BIGENDIAN],
186[
187  AC_C_BIGENDIAN
188])
189
190# gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
191# is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
192# output a spurious "(cached)" mark in the midst of other configure output.
193# This macro should be used instead of AC_CACHE_VAL when it is not surrounded
194# by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
195AC_DEFUN([gl_CACHE_VAL_SILENT],
196[
197  saved_as_echo_n="$as_echo_n"
198  as_echo_n=':'
199  AC_CACHE_VAL([$1], [$2])
200  as_echo_n="$saved_as_echo_n"
201])
202