Commit | Line | Data |
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f240aacb | 1 | # alloca.m4 serial 9 |
61cd9dc9 LC |
2 | dnl Copyright (C) 2002-2004, 2006-2007, 2009-2010 Free Software Foundation, |
3 | dnl Inc. | |
103dc4d4 LC |
4 | dnl This file is free software; the Free Software Foundation |
5 | dnl gives unlimited permission to copy and/or distribute it, | |
6 | dnl with or without modifications, as long as this notice is preserved. | |
7 | ||
8 | AC_DEFUN([gl_FUNC_ALLOCA], | |
9 | [ | |
10 | dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57. | |
11 | AC_REQUIRE([AC_PROG_CPP]) | |
12 | AC_REQUIRE([AC_PROG_EGREP]) | |
13 | ||
14 | AC_REQUIRE([AC_FUNC_ALLOCA]) | |
15 | if test $ac_cv_func_alloca_works = no; then | |
16 | gl_PREREQ_ALLOCA | |
17 | fi | |
18 | ||
19 | # Define an additional variable used in the Makefile substitution. | |
20 | if test $ac_cv_working_alloca_h = yes; then | |
21 | AC_CACHE_CHECK([for alloca as a compiler built-in], [gl_cv_rpl_alloca], [ | |
22 | AC_EGREP_CPP([Need own alloca], [ | |
23 | #if defined __GNUC__ || defined _AIX || defined _MSC_VER | |
24 | Need own alloca | |
25 | #endif | |
26 | ], [gl_cv_rpl_alloca=yes], [gl_cv_rpl_alloca=no]) | |
27 | ]) | |
28 | if test $gl_cv_rpl_alloca = yes; then | |
29 | dnl OK, alloca can be implemented through a compiler built-in. | |
f240aacb | 30 | AC_DEFINE([HAVE_ALLOCA], [1], |
103dc4d4 LC |
31 | [Define to 1 if you have 'alloca' after including <alloca.h>, |
32 | a header that may be supplied by this distribution.]) | |
33 | ALLOCA_H=alloca.h | |
34 | else | |
35 | dnl alloca exists as a library function, i.e. it is slow and probably | |
36 | dnl a memory leak. Don't define HAVE_ALLOCA in this case. | |
37 | ALLOCA_H= | |
38 | fi | |
39 | else | |
40 | ALLOCA_H=alloca.h | |
41 | fi | |
42 | AC_SUBST([ALLOCA_H]) | |
43 | ]) | |
44 | ||
45 | # Prerequisites of lib/alloca.c. | |
46 | # STACK_DIRECTION is already handled by AC_FUNC_ALLOCA. | |
47 | AC_DEFUN([gl_PREREQ_ALLOCA], [:]) |