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Annotation of embedaddon/libiconv/srcm4/extensions.m4, revision 1.1

1.1     ! misho       1: # serial 8  -*- Autoconf -*-
        !             2: # Enable extensions on systems that normally disable them.
        !             3: 
        !             4: # Copyright (C) 2003, 2006-2009 Free Software Foundation, Inc.
        !             5: # This file is free software; the Free Software Foundation
        !             6: # gives unlimited permission to copy and/or distribute it,
        !             7: # with or without modifications, as long as this notice is preserved.
        !             8: 
        !             9: # This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS
        !            10: # Autoconf.  Perhaps we can remove this once we can assume Autoconf
        !            11: # 2.62 or later everywhere, but since CVS Autoconf mutates rapidly
        !            12: # enough in this area it's likely we'll need to redefine
        !            13: # AC_USE_SYSTEM_EXTENSIONS for quite some time.
        !            14: 
        !            15: # AC_USE_SYSTEM_EXTENSIONS
        !            16: # ------------------------
        !            17: # Enable extensions on systems that normally disable them,
        !            18: # typically due to standards-conformance issues.
        !            19: # Remember that #undef in AH_VERBATIM gets replaced with #define by
        !            20: # AC_DEFINE.  The goal here is to define all known feature-enabling
        !            21: # macros, then, if reports of conflicts are made, disable macros that
        !            22: # cause problems on some platforms (such as __EXTENSIONS__).
        !            23: AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS],
        !            24: [AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
        !            25: AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
        !            26: 
        !            27:   AC_REQUIRE([AC_CANONICAL_HOST])
        !            28: 
        !            29:   AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=])
        !            30:   if test "$MINIX" = yes; then
        !            31:     AC_DEFINE([_POSIX_SOURCE], [1],
        !            32:       [Define to 1 if you need to in order for `stat' and other
        !            33:        things to work.])
        !            34:     AC_DEFINE([_POSIX_1_SOURCE], [2],
        !            35:       [Define to 2 if the system does not provide POSIX.1 features
        !            36:        except with this defined.])
        !            37:     AC_DEFINE([_MINIX], [1],
        !            38:       [Define to 1 if on MINIX.])
        !            39:   fi
        !            40: 
        !            41:   dnl HP-UX 11.11 defines mbstate_t only if _XOPEN_SOURCE is defined to 500,
        !            42:   dnl regardless of whether the flags -Ae or _D_HPUX_SOURCE=1 are already
        !            43:   dnl provided.
        !            44:   case "$host_os" in
        !            45:     hpux*)
        !            46:       AC_DEFINE([_XOPEN_SOURCE], [500],
        !            47:         [Define to 500 only on HP-UX.])
        !            48:       ;;
        !            49:   esac
        !            50: 
        !            51:   AH_VERBATIM([__EXTENSIONS__],
        !            52: [/* Enable extensions on AIX 3, Interix.  */
        !            53: #ifndef _ALL_SOURCE
        !            54: # undef _ALL_SOURCE
        !            55: #endif
        !            56: /* Enable GNU extensions on systems that have them.  */
        !            57: #ifndef _GNU_SOURCE
        !            58: # undef _GNU_SOURCE
        !            59: #endif
        !            60: /* Enable threading extensions on Solaris.  */
        !            61: #ifndef _POSIX_PTHREAD_SEMANTICS
        !            62: # undef _POSIX_PTHREAD_SEMANTICS
        !            63: #endif
        !            64: /* Enable extensions on HP NonStop.  */
        !            65: #ifndef _TANDEM_SOURCE
        !            66: # undef _TANDEM_SOURCE
        !            67: #endif
        !            68: /* Enable general extensions on Solaris.  */
        !            69: #ifndef __EXTENSIONS__
        !            70: # undef __EXTENSIONS__
        !            71: #endif
        !            72: ])
        !            73:   AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
        !            74:     [ac_cv_safe_to_define___extensions__],
        !            75:     [AC_COMPILE_IFELSE(
        !            76:        [AC_LANG_PROGRAM([[
        !            77: #        define __EXTENSIONS__ 1
        !            78:          ]AC_INCLUDES_DEFAULT])],
        !            79:        [ac_cv_safe_to_define___extensions__=yes],
        !            80:        [ac_cv_safe_to_define___extensions__=no])])
        !            81:   test $ac_cv_safe_to_define___extensions__ = yes &&
        !            82:     AC_DEFINE([__EXTENSIONS__])
        !            83:   AC_DEFINE([_ALL_SOURCE])
        !            84:   AC_DEFINE([_GNU_SOURCE])
        !            85:   AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
        !            86:   AC_DEFINE([_TANDEM_SOURCE])
        !            87: ])# AC_USE_SYSTEM_EXTENSIONS
        !            88: 
        !            89: # gl_USE_SYSTEM_EXTENSIONS
        !            90: # ------------------------
        !            91: # Enable extensions on systems that normally disable them,
        !            92: # typically due to standards-conformance issues.
        !            93: AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS],
        !            94: [
        !            95:   dnl Require this macro before AC_USE_SYSTEM_EXTENSIONS.
        !            96:   dnl gnulib does not need it. But if it gets required by third-party macros
        !            97:   dnl after AC_USE_SYSTEM_EXTENSIONS is required, autoconf 2.62..2.63 emit a
        !            98:   dnl warning: "AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS".
        !            99:   dnl Note: We can do this only for one of the macros AC_AIX, AC_GNU_SOURCE,
        !           100:   dnl AC_MINIX. If people still use AC_AIX or AC_MINIX, they are out of luck.
        !           101:   AC_REQUIRE([AC_GNU_SOURCE])
        !           102: 
        !           103:   AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
        !           104: ])