m4/gnulib-common.m4

   1 # gnulib-common.m4 serial 23
   2 dnl Copyright (C) 2007-2011 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 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.
  50 AC_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.
  55 AC_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 # --------------------------------------------+---------+-----------+
  74 AC_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 # --------------------------------------------+---------+-----------+
  97 AC_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 # gl_ASSERT_NO_GNULIB_POSIXCHECK
 106 # asserts that there will never be a need to #define GNULIB_POSIXCHECK.
 107 # and thereby enables an optimization of configure and config.h.
 108 # Used by Emacs.
 109 AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
 110 [
 111   dnl Override gl_WARN_ON_USE_PREPARE.
 112   AC_DEFUN([gl_WARN_ON_USE_PREPARE], [])
 113 ])
 114
 115 # gl_ASSERT_NO_GNULIB_TESTS
 116 # asserts that there will be no gnulib tests in the scope of the configure.ac
 117 # and thereby enables an optimization of config.h.
 118 # Used by Emacs.
 119 AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
 120 [
 121   dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
 122   AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
 123 ])
 124
 125 # Test whether <features.h> exists.
 126 # Set HAVE_FEATURES_H.
 127 AC_DEFUN([gl_FEATURES_H],
 128 [
 129   AC_CHECK_HEADERS_ONCE([features.h])
 130   if test $ac_cv_header_features_h = yes; then
 131     HAVE_FEATURES_H=1
 132   else
 133     HAVE_FEATURES_H=0
 134   fi
 135   AC_SUBST([HAVE_FEATURES_H])
 136 ])
 137
 138 # m4_foreach_w
 139 # is a backport of autoconf-2.59c's m4_foreach_w.
 140 # Remove this macro when we can assume autoconf >= 2.60.
 141 m4_ifndef([m4_foreach_w],
 142   [m4_define([m4_foreach_w],
 143     [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
 144
 145 # AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])
 146 # ----------------------------------------------------
 147 # Backport of autoconf-2.63b's macro.
 148 # Remove this macro when we can assume autoconf >= 2.64.
 149 m4_ifndef([AS_VAR_IF],
 150 [m4_define([AS_VAR_IF],
 151 [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
 152
 153 # AC_PROG_MKDIR_P
 154 # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix
 155 # for interoperability with automake-1.9.6 from autoconf-2.62.
 156 # Remove this macro when we can assume autoconf >= 2.62 or
 157 # autoconf >= 2.60 && automake >= 1.10.
 158 m4_ifdef([AC_PROG_MKDIR_P], [
 159   dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed.
 160   m4_define([AC_PROG_MKDIR_P],
 161     m4_defn([AC_PROG_MKDIR_P])[
 162     AC_SUBST([MKDIR_P])])], [
 163   dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P.
 164   AC_DEFUN_ONCE([AC_PROG_MKDIR_P],
 165     [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
 166      MKDIR_P='$(mkdir_p)'
 167      AC_SUBST([MKDIR_P])])])
 168
 169 # AC_C_RESTRICT
 170 # This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61,
 171 # so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++
 172 # works.
 173 # This definition can be removed once autoconf >= 2.62 can be assumed.
 174 m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]),[2.62]),[-1],[
 175 AC_DEFUN([AC_C_RESTRICT],
 176 [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
 177   [ac_cv_c_restrict=no
 178    # The order here caters to the fact that C++ does not require restrict.
 179    for ac_kw in __restrict __restrict__ _Restrict restrict; do
 180      AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
 181       [[typedef int * int_ptr;
 182         int foo (int_ptr $ac_kw ip) {
 183         return ip[0];
 184        }]],
 185       [[int s[1];
 186         int * $ac_kw t = s;
 187         t[0] = 0;
 188         return foo(t)]])],
 189       [ac_cv_c_restrict=$ac_kw])
 190      test "$ac_cv_c_restrict" != no && break
 191    done
 192   ])
 193  AH_VERBATIM([restrict],
 194 [/* Define to the equivalent of the C99 'restrict' keyword, or to
 195    nothing if this is not supported.  Do not define if restrict is
 196    supported directly.  */
 197 #undef restrict
 198 /* Work around a bug in Sun C++: it does not support _Restrict, even
 199    though the corresponding Sun C compiler does, which causes
 200    "#define restrict _Restrict" in the previous line.  Perhaps some future
 201    version of Sun C++ will work with _Restrict; if so, it'll probably
 202    define __RESTRICT, just as Sun C does.  */
 203 #if defined __SUNPRO_CC && !defined __RESTRICT
 204 # define _Restrict
 205 #endif])
 206  case $ac_cv_c_restrict in
 207    restrict) ;;
 208    no) AC_DEFINE([restrict], []) ;;
 209    *)  AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
 210  esac
 211 ])
 212 ])
 213
 214 # gl_BIGENDIAN
 215 # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
 216 # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
 217 # macros invoke AC_C_BIGENDIAN with arguments.
 218 AC_DEFUN([gl_BIGENDIAN],
 219 [
 220   AC_C_BIGENDIAN
 221 ])
 222
 223 # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
 224 # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
 225 # output a spurious "(cached)" mark in the midst of other configure output.
 226 # This macro should be used instead of AC_CACHE_VAL when it is not surrounded
 227 # by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
 228 AC_DEFUN([gl_CACHE_VAL_SILENT],
 229 [
 230   saved_as_echo_n="$as_echo_n"
 231   as_echo_n=':'
 232   AC_CACHE_VAL([$1], [$2])
 233   as_echo_n="$saved_as_echo_n"
 234 ])