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- 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_CHECK_FUNC],defn([AC_CHECK_FUNC]))dnl
- define([AC_CHECK_FUNC], [dnl
- patsubst(_AC_CHECK_FUNC($@), [#include.*$], [#define $1 innocuous_$1
- \&
- #undef $1])])dnl
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