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#
# Does the platform support __private_extern__? There is surely a better way
# to check this.
#
AC_DEFUN([DISPATCH_C_PRIVATE_EXTERN], [
AC_CACHE_CHECK([for __attribute__((visibility("hidden")))],
dispatch_cv_hidden_visibility_attribute, [
AC_TRY_LINK([],
[extern __attribute__ ((visibility ("hidden"))) int foo;],
[dispatch_cv_hidden_visibility_attribute=yes],
[dispatch_cv_hidden_visibility_attribute=no])])
AC_CACHE_CHECK([for __private_extern__],
dispatch_cv_private_extern, [
AC_TRY_LINK([], [__private_extern__ int foo;],
[dispatch_cv_private_extern=yes],
[dispatch_cv_private_extern=no])])
if test $dispatch_cv_private_extern = yes; then
AC_DEFINE(HAVE_PRIVATE_EXTERN, 1, Define if __private_extern__ present)
elif test $dispatch_cv_hidden_visibility_attribute = yes; then
AC_DEFINE(HAVE_PRIVATE_EXTERN, 1, Define if __private_extern__ present)
AC_DEFINE([__private_extern__], [extern __attribute__ ((visibility ("hidden")))],
[Define to a replacement for __private_extern])
else
AC_DEFINE([__private_extern__], [extern],
[Define to a replacement for __private_extern])
fi
])
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