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# Check for -fvisibility and the related __attribute__s
AC_DEFUN([CF_CHECK_VISIBILITY],
[
AC_MSG_CHECKING([whether the C compiler supports -fvisibility=hidden and the visibility __attribute__])
saved_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -fvisibility=hidden -Werror"
AC_RUN_IFELSE([AC_LANG_SOURCE([[
__attribute__((visibility("hidden")))
int t1(void)
{
return 0;
}
__attribute__((visibility("default")))
int t2(void)
{
return 0;
}
int main(void)
{
t1();
t2();
return 0;
}
]])],[
AC_MSG_RESULT([yes])
AC_DEFINE([HAVE_VISIBILITY], 1, [Define if __attribute__((visibility)) is supported])
CFLAGS="$saved_CFLAGS -fvisibility=hidden"
],[
AC_MSG_RESULT([no])
CFLAGS="$saved_CFLAGS"
],[
AC_MSG_RESULT([skipped because cross compiling])
])
])
|
