Commit | Line | Data |
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dd7d0148 | 1 | # alloca.m4 serial 11 |
49114fd4 | 2 | dnl Copyright (C) 2002-2004, 2006-2007, 2009-2011 Free Software Foundation, |
61cd9dc9 | 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 | [ | |
103dc4d4 LC |
10 | AC_REQUIRE([AC_FUNC_ALLOCA]) |
11 | if test $ac_cv_func_alloca_works = no; then | |
12 | gl_PREREQ_ALLOCA | |
13 | fi | |
14 | ||
15 | # Define an additional variable used in the Makefile substitution. | |
16 | if test $ac_cv_working_alloca_h = yes; then | |
17 | AC_CACHE_CHECK([for alloca as a compiler built-in], [gl_cv_rpl_alloca], [ | |
18 | AC_EGREP_CPP([Need own alloca], [ | |
19 | #if defined __GNUC__ || defined _AIX || defined _MSC_VER | |
20 | Need own alloca | |
21 | #endif | |
22 | ], [gl_cv_rpl_alloca=yes], [gl_cv_rpl_alloca=no]) | |
23 | ]) | |
24 | if test $gl_cv_rpl_alloca = yes; then | |
25 | dnl OK, alloca can be implemented through a compiler built-in. | |
f240aacb | 26 | AC_DEFINE([HAVE_ALLOCA], [1], |
103dc4d4 LC |
27 | [Define to 1 if you have 'alloca' after including <alloca.h>, |
28 | a header that may be supplied by this distribution.]) | |
29 | ALLOCA_H=alloca.h | |
30 | else | |
31 | dnl alloca exists as a library function, i.e. it is slow and probably | |
32 | dnl a memory leak. Don't define HAVE_ALLOCA in this case. | |
33 | ALLOCA_H= | |
34 | fi | |
35 | else | |
36 | ALLOCA_H=alloca.h | |
37 | fi | |
38 | AC_SUBST([ALLOCA_H]) | |
dd7d0148 | 39 | AM_CONDITIONAL([GL_GENERATE_ALLOCA_H], [test -n "$ALLOCA_H"]) |
103dc4d4 LC |
40 | ]) |
41 | ||
42 | # Prerequisites of lib/alloca.c. | |
43 | # STACK_DIRECTION is already handled by AC_FUNC_ALLOCA. | |
44 | AC_DEFUN([gl_PREREQ_ALLOCA], [:]) |