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configure: make sure LTO does not optimize out the test functions

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Fixes trac ticket #5909

Bud-Id: https://bugs.gentoo.org/show_bug.cgi?id=598054
Acked-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
This commit is contained in:
Andreas Cadhalpun 2016-10-25 19:09:46 +02:00
parent 97792e85c3
commit 890eb3d7c4
1 changed files with 7 additions and 1 deletions
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8
configure vendored
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@ -1146,10 +1146,16 @@ check_func_headers(){
for hdr in $headers; do
print_include $hdr
done
echo "#include <stdint.h>"
for func in $funcs; do
echo "long check_$func(void) { return (long) $func; }"
done
echo "int main(void) { return 0; }"
echo "int main(void) { int ret = 0;"
# LTO could optimize out the test functions without this
for func in $funcs; do
echo " ret |= ((intptr_t)check_$func) & 0xFFFF;"
done
echo "return ret; }"
} | check_ld "cc" "$@" && enable $funcs && enable_safe $headers
}