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4a462e3544
Because of how Guile saves and restores continuations (by copying the stack), and how it uses alloca to create space for debug information on the stack, we must have an alloca() that really does use the stack, and not one that uses the heap. To do this, we use the Gnulib "alloca-opt" module instead of "alloca". This commit also updates the Gnulib sources from the current Gnulib Git repository.
94 lines
3.2 KiB
Text
94 lines
3.2 KiB
Text
# serial 6 -*- Autoconf -*-
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# Enable extensions on systems that normally disable them.
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# Copyright (C) 2003, 2006-2008 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS
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# Autoconf. Perhaps we can remove this once we can assume Autoconf
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# 2.62 or later everywhere, but since CVS Autoconf mutates rapidly
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# enough in this area it's likely we'll need to redefine
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# AC_USE_SYSTEM_EXTENSIONS for quite some time.
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# AC_USE_SYSTEM_EXTENSIONS
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# ------------------------
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# Enable extensions on systems that normally disable them,
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# typically due to standards-conformance issues.
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# Remember that #undef in AH_VERBATIM gets replaced with #define by
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# AC_DEFINE. The goal here is to define all known feature-enabling
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# macros, then, if reports of conflicts are made, disable macros that
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# cause problems on some platforms (such as __EXTENSIONS__).
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AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS],
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[AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl
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AC_BEFORE([$0], [AC_RUN_IFELSE])dnl
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AC_REQUIRE([AC_CANONICAL_HOST])
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AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=])
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if test "$MINIX" = yes; then
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AC_DEFINE([_POSIX_SOURCE], [1],
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[Define to 1 if you need to in order for `stat' and other
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things to work.])
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AC_DEFINE([_POSIX_1_SOURCE], [2],
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[Define to 2 if the system does not provide POSIX.1 features
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except with this defined.])
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AC_DEFINE([_MINIX], [1],
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[Define to 1 if on MINIX.])
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fi
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dnl HP-UX 11.11 defines mbstate_t only if _XOPEN_SOURCE is defined to 500,
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dnl regardless of whether the flags -Ae or _D_HPUX_SOURCE=1 are already
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dnl provided.
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case "$host_os" in
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hpux*)
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AC_DEFINE([_XOPEN_SOURCE], [500],
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[Define to 500 only on HP-UX.])
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;;
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esac
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AH_VERBATIM([__EXTENSIONS__],
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[/* Enable extensions on AIX 3, Interix. */
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#ifndef _ALL_SOURCE
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# undef _ALL_SOURCE
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#endif
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/* Enable GNU extensions on systems that have them. */
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#ifndef _GNU_SOURCE
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# undef _GNU_SOURCE
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#endif
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/* Enable threading extensions on Solaris. */
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#ifndef _POSIX_PTHREAD_SEMANTICS
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# undef _POSIX_PTHREAD_SEMANTICS
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#endif
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/* Enable extensions on HP NonStop. */
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#ifndef _TANDEM_SOURCE
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# undef _TANDEM_SOURCE
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#endif
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/* Enable general extensions on Solaris. */
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#ifndef __EXTENSIONS__
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# undef __EXTENSIONS__
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#endif
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])
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AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
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[ac_cv_safe_to_define___extensions__],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[
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# define __EXTENSIONS__ 1
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]AC_INCLUDES_DEFAULT])],
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[ac_cv_safe_to_define___extensions__=yes],
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[ac_cv_safe_to_define___extensions__=no])])
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test $ac_cv_safe_to_define___extensions__ = yes &&
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AC_DEFINE([__EXTENSIONS__])
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AC_DEFINE([_ALL_SOURCE])
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AC_DEFINE([_GNU_SOURCE])
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AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
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AC_DEFINE([_TANDEM_SOURCE])
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])# AC_USE_SYSTEM_EXTENSIONS
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# gl_USE_SYSTEM_EXTENSIONS
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# ------------------------
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# Enable extensions on systems that normally disable them,
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# typically due to standards-conformance issues.
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AC_DEFUN([gl_USE_SYSTEM_EXTENSIONS],
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[AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])])
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