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# 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"

])