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view m4/alloca.m4 @ 273:88bbffa404ea 2.5 2.5
Updated version for release
author | lost |
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date | Sun, 16 Aug 2009 17:18:11 +0000 |
parents | d5392bb5da3c |
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# alloca.m4 serial 8 dnl Copyright (C) 2002-2004, 2006, 2007 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, 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 fi # Define an additional variable used in the Makefile substitution. if test $ac_cv_working_alloca_h = yes; then AC_CACHE_CHECK([for alloca as a compiler built-in], [gl_cv_rpl_alloca], [ AC_EGREP_CPP([Need own alloca], [ #if defined __GNUC__ || defined _AIX || defined _MSC_VER Need own alloca #endif ], [gl_cv_rpl_alloca=yes], [gl_cv_rpl_alloca=no]) ]) if test $gl_cv_rpl_alloca = yes; then dnl OK, alloca can be implemented through a compiler built-in. AC_DEFINE([HAVE_ALLOCA], 1, [Define to 1 if you have 'alloca' after including <alloca.h>, a header that may be supplied by this distribution.]) ALLOCA_H=alloca.h else dnl alloca exists as a library function, i.e. it is slow and probably dnl a memory leak. Don't define HAVE_ALLOCA in this case. ALLOCA_H= fi else ALLOCA_H=alloca.h fi AC_SUBST([ALLOCA_H]) ]) # Prerequisites of lib/alloca.c. # STACK_DIRECTION is already handled by AC_FUNC_ALLOCA. AC_DEFUN([gl_PREREQ_ALLOCA], [:])