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1 # gnulib-common.m4 serial 6
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2 dnl Copyright (C) 2007-2008 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 # gl_COMMON
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8 # is expanded unconditionally through gnulib-tool magic.
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9 AC_DEFUN([gl_COMMON], [
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10 dnl Use AC_REQUIRE here, so that the code is expanded once only.
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11 AC_REQUIRE([gl_COMMON_BODY])
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12 ])
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13 AC_DEFUN([gl_COMMON_BODY], [
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14 AH_VERBATIM([isoc99_inline],
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15 [/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports
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16 the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of
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17 earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.
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18 __APPLE__ && __MACH__ test for MacOS X.
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19 __APPLE_CC__ tests for the Apple compiler and its version.
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20 __STDC_VERSION__ tests for the C99 mode. */
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21 #if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
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22 # define __GNUC_STDC_INLINE__ 1
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23 #endif])
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24 AH_VERBATIM([unused_parameter],
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25 [/* Define as a marker that can be attached to function parameter declarations
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26 for parameters that are not used. This helps to reduce warnings, such as
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27 from GCC -Wunused-parameter. */
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28 #if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
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29 # define _UNUSED_PARAMETER_ __attribute__ ((__unused__))
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30 #else
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31 # define _UNUSED_PARAMETER_
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32 #endif
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33 ])
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34 ])
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35
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36 # gl_MODULE_INDICATOR([modulename])
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37 # defines a C macro indicating the presence of the given module.
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38 AC_DEFUN([gl_MODULE_INDICATOR],
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39 [
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40 AC_DEFINE([GNULIB_]translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
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41 [Define to 1 when using the gnulib module ]$1[.])
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42 ])
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43
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44 # m4_foreach_w
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45 # is a backport of autoconf-2.59c's m4_foreach_w.
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46 # Remove this macro when we can assume autoconf >= 2.60.
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47 m4_ifndef([m4_foreach_w],
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48 [m4_define([m4_foreach_w],
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49 [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
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50
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51 # AC_PROG_MKDIR_P
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52 # is a backport of autoconf-2.60's AC_PROG_MKDIR_P.
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53 # Remove this macro when we can assume autoconf >= 2.60.
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54 m4_ifdef([AC_PROG_MKDIR_P], [], [
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55 AC_DEFUN([AC_PROG_MKDIR_P],
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56 [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
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57 MKDIR_P='$(mkdir_p)'
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58 AC_SUBST([MKDIR_P])])])
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59
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60 # AC_C_RESTRICT
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61 # This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61,
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62 # so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++
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63 # works.
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64 # This definition can be removed once autoconf >= 2.62 can be assumed.
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65 AC_DEFUN([AC_C_RESTRICT],
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66 [AC_CACHE_CHECK([for C/C++ restrict keyword], ac_cv_c_restrict,
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67 [ac_cv_c_restrict=no
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68 # The order here caters to the fact that C++ does not require restrict.
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69 for ac_kw in __restrict __restrict__ _Restrict restrict; do
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70 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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71 [[typedef int * int_ptr;
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72 int foo (int_ptr $ac_kw ip) {
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73 return ip[0];
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74 }]],
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75 [[int s[1];
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76 int * $ac_kw t = s;
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77 t[0] = 0;
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78 return foo(t)]])],
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79 [ac_cv_c_restrict=$ac_kw])
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80 test "$ac_cv_c_restrict" != no && break
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81 done
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82 ])
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83 AH_VERBATIM([restrict],
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84 [/* Define to the equivalent of the C99 'restrict' keyword, or to
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85 nothing if this is not supported. Do not define if restrict is
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86 supported directly. */
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87 #undef restrict
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88 /* Work around a bug in Sun C++: it does not support _Restrict, even
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89 though the corresponding Sun C compiler does, which causes
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90 "#define restrict _Restrict" in the previous line. Perhaps some future
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91 version of Sun C++ will work with _Restrict; if so, it'll probably
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92 define __RESTRICT, just as Sun C does. */
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93 #if defined __SUNPRO_CC && !defined __RESTRICT
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94 # define _Restrict
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95 #endif])
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96 case $ac_cv_c_restrict in
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97 restrict) ;;
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98 no) AC_DEFINE([restrict], []) ;;
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99 *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
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100 esac
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101 ])
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