diff options
Diffstat (limited to 'gnulib-m4/alloca.m4')
| -rw-r--r-- | gnulib-m4/alloca.m4 | 86 |
1 files changed, 6 insertions, 80 deletions
diff --git a/gnulib-m4/alloca.m4 b/gnulib-m4/alloca.m4 index 8408bed..f3ee343 100644 --- a/gnulib-m4/alloca.m4 +++ b/gnulib-m4/alloca.m4 @@ -1,5 +1,5 @@ -# alloca.m4 serial 14 -dnl Copyright (C) 2002-2004, 2006-2007, 2009-2015 Free Software Foundation, +# alloca.m4 serial 9 +dnl Copyright (C) 2002-2004, 2006-2007, 2009-2010 Free Software Foundation, dnl Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -7,6 +7,10 @@ dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_ALLOCA], [ + dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57. + AC_REQUIRE([AC_PROG_CPP]) + AC_REQUIRE([AC_PROG_EGREP]) + AC_REQUIRE([AC_FUNC_ALLOCA]) if test $ac_cv_func_alloca_works = no; then gl_PREREQ_ALLOCA @@ -36,86 +40,8 @@ AC_DEFUN([gl_FUNC_ALLOCA], ALLOCA_H=alloca.h fi AC_SUBST([ALLOCA_H]) - AM_CONDITIONAL([GL_GENERATE_ALLOCA_H], [test -n "$ALLOCA_H"]) ]) # Prerequisites of lib/alloca.c. # STACK_DIRECTION is already handled by AC_FUNC_ALLOCA. AC_DEFUN([gl_PREREQ_ALLOCA], [:]) - -# This works around a bug in autoconf <= 2.68. -# See <http://lists.gnu.org/archive/html/bug-gnulib/2011-06/msg00277.html>. - -m4_version_prereq([2.69], [] ,[ - -# This is taken from the following Autoconf patch: -# http://git.savannah.gnu.org/cgit/autoconf.git/commit/?id=6cd9f12520b0d6f76d3230d7565feba1ecf29497 - -# _AC_LIBOBJ_ALLOCA -# ----------------- -# Set up the LIBOBJ replacement of 'alloca'. Well, not exactly -# AC_LIBOBJ since we actually set the output variable 'ALLOCA'. -# Nevertheless, for Automake, AC_LIBSOURCES it. -m4_define([_AC_LIBOBJ_ALLOCA], -[# The SVR3 libPW and SVR4 libucb both contain incompatible functions -# that cause trouble. Some versions do not even contain alloca or -# contain a buggy version. If you still want to use their alloca, -# use ar to extract alloca.o from them instead of compiling alloca.c. -AC_LIBSOURCES(alloca.c) -AC_SUBST([ALLOCA], [\${LIBOBJDIR}alloca.$ac_objext])dnl -AC_DEFINE(C_ALLOCA, 1, [Define to 1 if using 'alloca.c'.]) - -AC_CACHE_CHECK(whether 'alloca.c' needs Cray hooks, ac_cv_os_cray, -[AC_EGREP_CPP(webecray, -[#if defined CRAY && ! defined CRAY2 -webecray -#else -wenotbecray -#endif -], ac_cv_os_cray=yes, ac_cv_os_cray=no)]) -if test $ac_cv_os_cray = yes; then - for ac_func in _getb67 GETB67 getb67; do - AC_CHECK_FUNC($ac_func, - [AC_DEFINE_UNQUOTED(CRAY_STACKSEG_END, $ac_func, - [Define to one of '_getb67', 'GETB67', - 'getb67' for Cray-2 and Cray-YMP - systems. This function is required for - 'alloca.c' support on those systems.]) - break]) - done -fi - -AC_CACHE_CHECK([stack direction for C alloca], - [ac_cv_c_stack_direction], -[AC_RUN_IFELSE([AC_LANG_SOURCE( -[AC_INCLUDES_DEFAULT -int -find_stack_direction (int *addr, int depth) -{ - int dir, dummy = 0; - if (! addr) - addr = &dummy; - *addr = addr < &dummy ? 1 : addr == &dummy ? 0 : -1; - dir = depth ? find_stack_direction (addr, depth - 1) : 0; - return dir + dummy; -} - -int -main (int argc, char **argv) -{ - return find_stack_direction (0, argc + !argv + 20) < 0; -}])], - [ac_cv_c_stack_direction=1], - [ac_cv_c_stack_direction=-1], - [ac_cv_c_stack_direction=0])]) -AH_VERBATIM([STACK_DIRECTION], -[/* If using the C implementation of alloca, define if you know the - direction of stack growth for your system; otherwise it will be - automatically deduced at runtime. - STACK_DIRECTION > 0 => grows toward higher addresses - STACK_DIRECTION < 0 => grows toward lower addresses - STACK_DIRECTION = 0 => direction of growth unknown */ -@%:@undef STACK_DIRECTION])dnl -AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction) -])# _AC_LIBOBJ_ALLOCA -]) |