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      1 # gnulib-common.m4 serial 11
      2 dnl Copyright (C) 2007-2009 Free Software Foundation, Inc.
      3 dnl This file is free software; the Free Software Foundation
      4 dnl gives unlimited permission to copy and/or distribute it,
      5 dnl with or without modifications, as long as this notice is preserved.
      6 
      7 # gl_COMMON
      8 # is expanded unconditionally through gnulib-tool magic.
      9 AC_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 ])
     14 AC_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.
     39 AC_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.
     48 m4_ifndef([m4_foreach_w],
     49   [m4_define([m4_foreach_w],
     50     [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
     51 
     52 # AC_PROG_MKDIR_P
     53 # is a backport of autoconf-2.60's AC_PROG_MKDIR_P.
     54 # Remove this macro when we can assume autoconf >= 2.60.
     55 m4_ifdef([AC_PROG_MKDIR_P], [], [
     56   AC_DEFUN_ONCE([AC_PROG_MKDIR_P],
     57     [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
     58      MKDIR_P='$(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.
     66 AC_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.
    108 AC_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.
    118 AC_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