m4/gnulib-common.m4

   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 ])