| dnl This Source Code Form is subject to the terms of the Mozilla Public |
| dnl dnl License, v. 2.0. If a copy of the MPL was not distributed with this |
| dnl dnl file, You can obtain one at http://mozilla.org/MPL/2.0/. |
| |
| dnl Set of hotfixes to address issues in autoconf 2.13 |
| |
| dnl Divert AC_CHECK_FUNC so that the #includes it uses can't interfere |
| dnl with the function it tests. |
| dnl So, when testing e.g. posix_memalign, any #include that AC_CHECK_FUNC |
| dnl prints is replaced with: |
| dnl #define posix_memalign innocuous_posix_memalign |
| dnl #include "theinclude" |
| dnl #undef posix_memalign |
| dnl This avoids double declaration of that function when the header normally |
| dnl declares it, while the test itself is just expecting the function not to be |
| dnl declared at all, and declares it differently (which doesn't matter for the |
| dnl test itself). |
| dnl More recent versions of autoconf are essentially doing this. |
| define([ac_cv_func_], [ac_cv_func2_])dnl |
| define([_AC_CHECK_FUNC],defn([AC_CHECK_FUNC]))dnl |
| define([AC_CHECK_FUNC], [dnl |
| patsubst(_AC_CHECK_FUNC($@), [#include.*$], [#define $1 innocuous_$1 |
| \& |
| #undef $1])])dnl |
