| 1 | # serial 11 -*- Autoconf -*-
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| 2 | # Enable extensions on systems that normally disable them.
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| 3 |
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| 4 | # Copyright (C) 2003, 2006-2012 Free Software Foundation, Inc.
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| 5 | # This file is free software; the Free Software Foundation
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| 6 | # gives unlimited permission to copy and/or distribute it,
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| 7 | # with or without modifications, as long as this notice is preserved.
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| 8 |
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| 9 | # This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS
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| 10 | # Autoconf. Perhaps we can remove this once we can assume Autoconf
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| 11 | # 2.62 or later everywhere, but since CVS Autoconf mutates rapidly
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| 12 | # enough in this area it's likely we'll need to redefine
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| 13 | # AC_USE_SYSTEM_EXTENSIONS for quite some time.
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| 14 |
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| 15 | # If autoconf reports a warning
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| 16 | # warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
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| 17 | # or warning: AC_RUN_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
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| 18 | # the fix is
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| 19 | # 1) to ensure that AC_USE_SYSTEM_EXTENSIONS is never directly invoked
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| 20 | # but always AC_REQUIREd,
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| 21 | # 2) to ensure that for each occurrence of
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| 22 | # AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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| 23 | # or
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| 24 | # AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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| 25 | # the corresponding gnulib module description has 'extensions' among
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| 26 | # its dependencies. This will ensure that the gl_USE_SYSTEM_EXTENSIONS
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| 27 | # invocation occurs in gl_EARLY, not in gl_INIT.
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| 28 |
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| 29 | # AC_USE_SYSTEM_EXTENSIONS
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| 30 | # ------------------------
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| 31 | # Enable extensions on systems that normally disable them,
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| 32 | # typically due to standards-conformance issues.
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| 33 | # Remember that #undef in AH_VERBATIM gets replaced with #define by
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| 34 | # AC_DEFINE. The goal here is to define all known feature-enabling
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| 35 | # macros, then, if reports of conflicts are made, disable macros that
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| 36 | # cause problems on some platforms (such as __EXTENSIONS__).
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| 37 | AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS],
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| 38 | [AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
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| 39 | AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
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| 40 |
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| 41 | AC_REQUIRE([AC_CANONICAL_HOST])
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| 42 |
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| 43 | AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=])
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| 44 | if test "$MINIX" = yes; then
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| 45 | AC_DEFINE([_POSIX_SOURCE], [1],
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| 46 | [Define to 1 if you need to in order for 'stat' and other
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| 47 | things to work.])
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| 48 | AC_DEFINE([_POSIX_1_SOURCE], [2],
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| 49 | [Define to 2 if the system does not provide POSIX.1 features
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| 50 | except with this defined.])
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| 51 | AC_DEFINE([_MINIX], [1],
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| 52 | [Define to 1 if on MINIX.])
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| 53 | fi
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| 54 |
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| 55 | dnl HP-UX 11.11 defines mbstate_t only if _XOPEN_SOURCE is defined to 500,
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| 56 | dnl regardless of whether the flags -Ae or _D_HPUX_SOURCE=1 are already
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| 57 | dnl provided.
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| 58 | case "$host_os" in
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| 59 | hpux*)
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| 60 | AC_DEFINE([_XOPEN_SOURCE], [500],
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| 61 | [Define to 500 only on HP-UX.])
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| 62 | ;;
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| 63 | esac
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| 64 |
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| 65 | AH_VERBATIM([__EXTENSIONS__],
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| 66 | [/* Enable extensions on AIX 3, Interix. */
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| 67 | #ifndef _ALL_SOURCE
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| 68 | # undef _ALL_SOURCE
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| 69 | #endif
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| 70 | /* Enable general extensions on MacOS X. */
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| 71 | #ifndef _DARWIN_C_SOURCE
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| 72 | # undef _DARWIN_C_SOURCE
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| 73 | #endif
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| 74 | /* Enable GNU extensions on systems that have them. */
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| 75 | #ifndef _GNU_SOURCE
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| 76 | # undef _GNU_SOURCE
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| 77 | #endif
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| 78 | /* Enable threading extensions on Solaris. */
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| 79 | #ifndef _POSIX_PTHREAD_SEMANTICS
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| 80 | # undef _POSIX_PTHREAD_SEMANTICS
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| 81 | #endif
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| 82 | /* Enable extensions on HP NonStop. */
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| 83 | #ifndef _TANDEM_SOURCE
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| 84 | # undef _TANDEM_SOURCE
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| 85 | #endif
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| 86 | /* Enable general extensions on Solaris. */
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| 87 | #ifndef __EXTENSIONS__
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| 88 | # undef __EXTENSIONS__
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| 89 | #endif
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| 90 | ])
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| 91 | AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
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| 92 | [ac_cv_safe_to_define___extensions__],
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| 93 | [AC_COMPILE_IFELSE(
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| 94 | [AC_LANG_PROGRAM([[
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| 95 | # define __EXTENSIONS__ 1
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| 96 | ]AC_INCLUDES_DEFAULT])],
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| 97 | [ac_cv_safe_to_define___extensions__=yes],
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| 98 | [ac_cv_safe_to_define___extensions__=no])])
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| 99 | test $ac_cv_safe_to_define___extensions__ = yes &&
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| 100 | AC_DEFINE([__EXTENSIONS__])
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| 101 | AC_DEFINE([_ALL_SOURCE])
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| 102 | AC_DEFINE([_DARWIN_C_SOURCE])
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| 103 | AC_DEFINE([_GNU_SOURCE])
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| 104 | AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
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| 105 | AC_DEFINE([_TANDEM_SOURCE])
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| 106 | ])# AC_USE_SYSTEM_EXTENSIONS
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| 107 |
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| 108 | # gl_USE_SYSTEM_EXTENSIONS
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| 109 | # ------------------------
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| 110 | # Enable extensions on systems that normally disable them,
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| 111 | # typically due to standards-conformance issues.
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| 112 | AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS],
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| 113 | [
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| 114 | dnl Require this macro before AC_USE_SYSTEM_EXTENSIONS.
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| 115 | dnl gnulib does not need it. But if it gets required by third-party macros
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| 116 | dnl after AC_USE_SYSTEM_EXTENSIONS is required, autoconf 2.62..2.63 emit a
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| 117 | dnl warning: "AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS".
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| 118 | dnl Note: We can do this only for one of the macros AC_AIX, AC_GNU_SOURCE,
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| 119 | dnl AC_MINIX. If people still use AC_AIX or AC_MINIX, they are out of luck.
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| 120 | AC_REQUIRE([AC_GNU_SOURCE])
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| 121 |
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| 122 | AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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| 123 | ])
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