41 lines
1.7 KiB
Plaintext
41 lines
1.7 KiB
Plaintext
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dnl Copyright (C) 2003, 2008 Silicon Graphics, Inc.
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dnl
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dnl This program is free software: you can redistribute it and/or modify it
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dnl under the terms of the GNU General Public License as published by
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dnl the Free Software Foundation, either version 2 of the License, or
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dnl (at your option) any later version.
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dnl
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dnl This program is distributed in the hope that it will be useful,
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dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
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dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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dnl GNU General Public License for more details.
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dnl
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dnl You should have received a copy of the GNU General Public License
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dnl along with this program. If not, see <http://www.gnu.org/licenses/>.
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AC_DEFUN([AC_FUNC_GCC_VISIBILITY],
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[AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
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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 \
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>/dev/null 2>&1; then
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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
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fi
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fi
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fi
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rm -f conftest.[cs]
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])
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if test $libc_cv_visibility_attribute = yes; then
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AC_DEFINE(HAVE_VISIBILITY_ATTRIBUTE, [], [GCC supports visibility attributes])
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AC_DEFINE(EXPORT, [__attribute__ ((visibility ("default"))) extern], [Visibility attribute for API symbols])
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CFLAGS="${CFLAGS} -fvisibility=hidden"
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else
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AC_DEFINE(EXPORT, [extern], [Visibility attribute for API symbols])
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fi
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])
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