diff options
Diffstat (limited to 'm4/alloca.m4')
| -rw-r--r-- | m4/alloca.m4 | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/m4/alloca.m4 b/m4/alloca.m4 index a9e3f45..eb62e0e 100644 --- a/m4/alloca.m4 +++ b/m4/alloca.m4 @@ -1,5 +1,5 @@ -# alloca.m4 serial 5 -dnl Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. +# alloca.m4 serial 7 +dnl Copyright (C) 2002-2004, 2006 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. @@ -17,16 +17,24 @@ AC_DEFUN([gl_FUNC_ALLOCA], # Define an additional variable used in the Makefile substitution. if test $ac_cv_working_alloca_h = yes; then - AC_EGREP_CPP([Need own alloca], [ + 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 + Need own alloca #endif - ], - [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], - [ALLOCA_H=]) + ], [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 |