2003-05-19 05:14:50 +00:00
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|
AC_DEFUN([AC_FUNC_GCC_VISIBILITY],
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|
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|
[AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
|
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|
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libc_cv_visibility_attribute,
|
|
|
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[cat > conftest.c <<EOF
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int foo __attribute__ ((visibility ("hidden"))) = 1;
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int bar __attribute__ ((visibility ("protected"))) = 1;
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EOF
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libc_cv_visibility_attribute=no
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if ${CC-cc} -Werror -S conftest.c -o conftest.s \
|
|
|
|
|
>/dev/null 2>&1; then
|
|
|
|
|
if grep '\.hidden.*foo' conftest.s >/dev/null; then
|
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|
|
if grep '\.protected.*bar' conftest.s >/dev/null; then
|
|
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|
|
libc_cv_visibility_attribute=yes
|
|
|
|
|
fi
|
|
|
|
|
fi
|
|
|
|
|
fi
|
|
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|
|
rm -f conftest.[cs]
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|
|
|
|
])
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|
|
|
|
if test $libc_cv_visibility_attribute = yes; then
|
2008-12-30 23:21:52 +01:00
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|
|
AC_DEFINE(HAVE_VISIBILITY_ATTRIBUTE, [], [GCC supports visibility attributes])
|
2003-05-19 05:14:50 +00:00
|
|
|
fi
|
|
|
|
|
])
|
