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extensions.m4
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extensions.m4

# Enable extensions on systems that normally disable them.
# Copyright (C) 2003, 2006 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 file is only needed in autoconf <= 2.59. Newer versions of autoconf
# have a macro AC_USE_SYSTEM_EXTENSIONS with identical semantics.
# gl_USE_SYSTEM_EXTENSIONS
# ------------------------
# Enable extensions on systems that normally disable them,
# typically due to standards-conformance issues.
AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS], [
#AC_BEFORE([$0], [AC_COMPILE_IFELSE])
#AC_BEFORE([$0], [AC_RUN_IFELSE])
# These are obsolete
# AC_REQUIRE([AC_GNU_SOURCE])
# AC_REQUIRE([AC_AIX])
# AC_REQUIRE([AC_MINIX])
#
AH_VERBATIM([__EXTENSIONS__],
[/* Enable extensions on Solaris. */
#ifndef __EXTENSIONS__
# undef __EXTENSIONS__
#endif
#ifndef _POSIX_PTHREAD_SEMANTICS
# undef _POSIX_PTHREAD_SEMANTICS
#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([_POSIX_PTHREAD_SEMANTICS])
])

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