2014-02-14 03:15:02 +04:00
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dnl This Source Code Form is subject to the terms of the Mozilla Public
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dnl dnl License, v. 2.0. If a copy of the MPL was not distributed with this
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dnl dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
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dnl Set of hotfixes to address issues in autoconf 2.13
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dnl Divert AC_CHECK_FUNC so that the #includes it uses can't interfere
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dnl with the function it tests.
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dnl So, when testing e.g. posix_memalign, any #include that AC_CHECK_FUNC
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dnl prints is replaced with:
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dnl #define posix_memalign innocuous_posix_memalign
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dnl #include "theinclude"
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dnl #undef posix_memalign
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dnl This avoids double declaration of that function when the header normally
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dnl declares it, while the test itself is just expecting the function not to be
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dnl declared at all, and declares it differently (which doesn't matter for the
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dnl test itself).
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dnl More recent versions of autoconf are essentially doing this.
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define([_AC_CHECK_FUNC],defn([AC_CHECK_FUNC]))dnl
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define([AC_CHECK_FUNC], [dnl
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2014-02-25 10:44:21 +04:00
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patsubst(_AC_CHECK_FUNC($@), [#include.*$], [#define $1 innocuous_$1
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2014-02-14 03:15:02 +04:00
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\&
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#undef $1])])dnl
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