File: extensions.m4

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# serial 9  -*- Autoconf -*-
# Enable extensions on systems that normally disable them.

# Copyright (C) 2003, 2006-2010 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS
# Autoconf.  Perhaps we can remove this once we can assume Autoconf
# 2.62 or later everywhere, but since CVS Autoconf mutates rapidly
# enough in this area it's likely we'll need to redefine
# AC_USE_SYSTEM_EXTENSIONS for quite some time.

# If autoconf reports a warning
#     warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
# or  warning: AC_RUN_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
# the fix is
#   1) to ensure that AC_USE_SYSTEM_EXTENSIONS is never directly invoked
#      but always AC_REQUIREd,
#   2) to ensure that for each occurrence of
#        AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
#      or
#        AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
#      the corresponding gnulib module description has 'extensions' among
#      its dependencies. This will ensure that the gl_USE_SYSTEM_EXTENSIONS
#      invocation occurs in gl_EARLY, not in gl_INIT.

# AC_USE_SYSTEM_EXTENSIONS
# ------------------------
# Enable extensions on systems that normally disable them,
# typically due to standards-conformance issues.
# Remember that #undef in AH_VERBATIM gets replaced with #define by
# AC_DEFINE.  The goal here is to define all known feature-enabling
# macros, then, if reports of conflicts are made, disable macros that
# cause problems on some platforms (such as __EXTENSIONS__).
AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS],
[AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
AC_BEFORE([$0], [AC_RUN_IFELSE])dnl

  AC_REQUIRE([AC_CANONICAL_HOST])

  AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=])
  if test "$MINIX" = yes; then
    AC_DEFINE([_POSIX_SOURCE], [1],
      [Define to 1 if you need to in order for `stat' and other
       things to work.])
    AC_DEFINE([_POSIX_1_SOURCE], [2],
      [Define to 2 if the system does not provide POSIX.1 features
       except with this defined.])
    AC_DEFINE([_MINIX], [1],
      [Define to 1 if on MINIX.])
  fi

  dnl HP-UX 11.11 defines mbstate_t only if _XOPEN_SOURCE is defined to 500,
  dnl regardless of whether the flags -Ae or _D_HPUX_SOURCE=1 are already
  dnl provided.
  case "$host_os" in
    hpux*)
      AC_DEFINE([_XOPEN_SOURCE], [500],
        [Define to 500 only on HP-UX.])
      ;;
  esac

  AH_VERBATIM([__EXTENSIONS__],
[/* Enable extensions on AIX 3, Interix.  */
#ifndef _ALL_SOURCE
# undef _ALL_SOURCE
#endif
/* Enable GNU extensions on systems that have them.  */
#ifndef _GNU_SOURCE
# undef _GNU_SOURCE
#endif
/* Enable threading extensions on Solaris.  */
#ifndef _POSIX_PTHREAD_SEMANTICS
# undef _POSIX_PTHREAD_SEMANTICS
#endif
/* Enable extensions on HP NonStop.  */
#ifndef _TANDEM_SOURCE
# undef _TANDEM_SOURCE
#endif
/* Enable general extensions on Solaris.  */
#ifndef __EXTENSIONS__
# undef __EXTENSIONS__
#endif
])
  AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
    [ac_cv_safe_to_define___extensions__],
    [AC_COMPILE_IFELSE(
       [AC_LANG_PROGRAM([[
#         define __EXTENSIONS__ 1
          ]AC_INCLUDES_DEFAULT])],
       [ac_cv_safe_to_define___extensions__=yes],
       [ac_cv_safe_to_define___extensions__=no])])
  test $ac_cv_safe_to_define___extensions__ = yes &&
    AC_DEFINE([__EXTENSIONS__])
  AC_DEFINE([_ALL_SOURCE])
  AC_DEFINE([_GNU_SOURCE])
  AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
  AC_DEFINE([_TANDEM_SOURCE])
])# AC_USE_SYSTEM_EXTENSIONS

# gl_USE_SYSTEM_EXTENSIONS
# ------------------------
# Enable extensions on systems that normally disable them,
# typically due to standards-conformance issues.
AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS],
[
  dnl Require this macro before AC_USE_SYSTEM_EXTENSIONS.
  dnl gnulib does not need it. But if it gets required by third-party macros
  dnl after AC_USE_SYSTEM_EXTENSIONS is required, autoconf 2.62..2.63 emit a
  dnl warning: "AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS".
  dnl Note: We can do this only for one of the macros AC_AIX, AC_GNU_SOURCE,
  dnl AC_MINIX. If people still use AC_AIX or AC_MINIX, they are out of luck.
  AC_REQUIRE([AC_GNU_SOURCE])

  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
])