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author | Anas Nashif <anas.nashif@intel.com> | 2012-11-05 11:10:13 -0800 |
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committer | Anas Nashif <anas.nashif@intel.com> | 2012-11-05 11:10:13 -0800 |
commit | 7be93f2d05131d061bd4790ae33c8d50f50010d7 (patch) | |
tree | 72736c1606f803a92ffa07c9808ffea2521d009e /m4/alloca.m4 | |
download | m4-7be93f2d05131d061bd4790ae33c8d50f50010d7.tar.gz m4-7be93f2d05131d061bd4790ae33c8d50f50010d7.tar.bz2 m4-7be93f2d05131d061bd4790ae33c8d50f50010d7.zip |
Imported Upstream version 1.4.16upstream/1.4.16
Diffstat (limited to 'm4/alloca.m4')
-rw-r--r-- | m4/alloca.m4 | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/m4/alloca.m4 b/m4/alloca.m4 new file mode 100644 index 0000000..e2e8a05 --- /dev/null +++ b/m4/alloca.m4 @@ -0,0 +1,43 @@ +# alloca.m4 serial 10 +dnl Copyright (C) 2002-2004, 2006-2007, 2009-2011 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, +dnl with or without modifications, as long as this notice is preserved. + +AC_DEFUN([gl_FUNC_ALLOCA], +[ + 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], [:]) |