mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2024-11-06 13:20:20 +00:00
47 lines
1.6 KiB
Plaintext
47 lines
1.6 KiB
Plaintext
# alloca.m4 serial 9
|
|
dnl Copyright (C) 2002-2004, 2006, 2007, 2009 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], [:])
|