# gnulib-common.m4 serial 20

dnl Copyright (C) 2007-2010 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_COMMON

# is expanded unconditionally through gnulib-tool magic.

AC_DEFUN([gl_COMMON], [

dnl Use AC_REQUIRE here, so that the code is expanded once only.

AC_REQUIRE([gl_00GNULIB])

AC_REQUIRE([gl_COMMON_BODY])

])

AC_DEFUN([gl_COMMON_BODY], [

AH_VERBATIM([isoc99_inline],

[/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports

the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of

earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.

__APPLE__ && __MACH__ test for MacOS X.

__APPLE_CC__ tests for the Apple compiler and its version.

__STDC_VERSION__ tests for the C99 mode. */

#if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__

# define __GNUC_STDC_INLINE__ 1

#endif])

AH_VERBATIM([unused_parameter],

[/* Define as a marker that can be attached to declarations that might not

be used. This helps to reduce warnings, such as from

GCC -Wunused-parameter. */

#if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)

# define _GL_UNUSED __attribute__ ((__unused__))

#else

# define _GL_UNUSED

#endif

/* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name

is a misnomer outside of parameter lists. */

#define _UNUSED_PARAMETER_ _GL_UNUSED

])

dnl Preparation for running test programs:

dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not

dnl to /dev/tty, so they can be redirected to log files. Such diagnostics

dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.

LIBC_FATAL_STDERR_=1

export LIBC_FATAL_STDERR_

])

# gl_MODULE_INDICATOR_CONDITION

# expands to a C preprocessor expression that evaluates to 1 or 0, depending

# whether a gnulib module that has been requested shall be considered present

# or not.

AC_DEFUN([gl_MODULE_INDICATOR_CONDITION], [1])

# gl_MODULE_INDICATOR_SET_VARIABLE([modulename])

# sets the shell variable that indicates the presence of the given module to

# a C preprocessor expression that will evaluate to 1.

AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],

[

GNULIB_[]m4_translit([[$1]],

[abcdefghijklmnopqrstuvwxyz./-],

[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=gl_MODULE_INDICATOR_CONDITION

])

# gl_MODULE_INDICATOR([modulename])

# defines a C macro indicating the presence of the given module

# in a location where it can be used.

# | Value | Value |

# | in lib/ | in tests/ |

# --------------------------------------------+---------+-----------+

# Module present among main modules: | 1 | 1 |

# --------------------------------------------+---------+-----------+

# Module present among tests-related modules: | 0 | 1 |

# --------------------------------------------+---------+-----------+

# Module not present at all: | 0 | 0 |

# --------------------------------------------+---------+-----------+

AC_DEFUN([gl_MODULE_INDICATOR],

[

AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],

[abcdefghijklmnopqrstuvwxyz./-],

[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),

[gl_MODULE_INDICATOR_CONDITION],

[Define to a C preprocessor expression that evaluates to 1 or 0,

depending whether the gnulib module $1 shall be considered present.])

])

# gl_MODULE_INDICATOR_FOR_TESTS([modulename])

# defines a C macro indicating the presence of the given module

# in lib or tests. This is useful to determine whether the module

# should be tested.

# | Value | Value |

# | in lib/ | in tests/ |

# --------------------------------------------+---------+-----------+

# Module present among main modules: | 1 | 1 |

# --------------------------------------------+---------+-----------+

# Module present among tests-related modules: | 1 | 1 |

# --------------------------------------------+---------+-----------+

# Module not present at all: | 0 | 0 |

# --------------------------------------------+---------+-----------+

AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],

[

AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],

[abcdefghijklmnopqrstuvwxyz./-],

[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],

[Define to 1 when the gnulib module $1 should be tested.])

])

# m4_foreach_w

# is a backport of autoconf-2.59c's m4_foreach_w.

# Remove this macro when we can assume autoconf >= 2.60.

m4_ifndef([m4_foreach_w],

[m4_define([m4_foreach_w],

[m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])

# AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])

# ----------------------------------------------------

# Backport of autoconf-2.63b's macro.

# Remove this macro when we can assume autoconf >= 2.64.

m4_ifndef([AS_VAR_IF],

[m4_define([AS_VAR_IF],

[AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])

# AC_PROG_MKDIR_P

# is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix

# for interoperability with automake-1.9.6 from autoconf-2.62.

# Remove this macro when we can assume autoconf >= 2.62 or

# autoconf >= 2.60 && automake >= 1.10.

m4_ifdef([AC_PROG_MKDIR_P], [

dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed.

m4_define([AC_PROG_MKDIR_P],

m4_defn([AC_PROG_MKDIR_P])[

AC_SUBST([MKDIR_P])])], [

dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P.

AC_DEFUN_ONCE([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.

m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]),[2.62]),[-1],[

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

])

])

# gl_BIGENDIAN

# is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.

# Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some

# macros invoke AC_C_BIGENDIAN with arguments.

AC_DEFUN([gl_BIGENDIAN],

[

AC_C_BIGENDIAN

])

# gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)

# is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not

# output a spurious "(cached)" mark in the midst of other configure output.

# This macro should be used instead of AC_CACHE_VAL when it is not surrounded

# by an AC_MSG_CHECKING/AC_MSG_RESULT pair.

AC_DEFUN([gl_CACHE_VAL_SILENT],

[

saved_as_echo_n="$as_echo_n"

as_echo_n=':'

AC_CACHE_VAL([$1], [$2])

as_echo_n="$saved_as_echo_n"

])