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Diffstat (limited to 'build/autoconf/hotfixes.m4')
| -rw-r--r-- | build/autoconf/hotfixes.m4 | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/build/autoconf/hotfixes.m4 b/build/autoconf/hotfixes.m4 new file mode 100644 index 000000000..9c8362041 --- /dev/null +++ b/build/autoconf/hotfixes.m4 @@ -0,0 +1,23 @@ +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 |