X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/34b340a08e9e56163ab6cff06189b071bd1937f3..7505b72ead138a4c33c67479bc0db51500b63576:/build/aclocal/visibility.m4 diff --git a/build/aclocal/visibility.m4 b/build/aclocal/visibility.m4 index 0f02567b9c..52c97f9c8e 100644 --- a/build/aclocal/visibility.m4 +++ b/build/aclocal/visibility.m4 @@ -43,7 +43,12 @@ AC_DEFUN([WX_VISIBILITY], #if defined(__GNUC__) && __GNUC__ < 4 error this gcc is too old; #endif - + + /* visibility only makes sense for ELF shared libs: */ + #if !defined(__ELF__) && !defined(__APPLE__) + error this platform has no visibility; + #endif + extern __attribute__((__visibility__("hidden"))) int hiddenvar; extern __attribute__((__visibility__("default"))) int exportedvar; extern __attribute__((__visibility__("hidden"))) int hiddenfunc (void); @@ -59,8 +64,8 @@ AC_DEFUN([WX_VISIBILITY], CXXFLAGS="$wx_save_CXXFLAGS"]) AC_MSG_RESULT([$wx_cv_cc_visibility]) if test $wx_cv_cc_visibility = yes; then - AC_DEFINE([HAVE_VISIBILITY]) - + dnl we do have basic visibility support, now check if we can use it: + dnl dnl Debian/Ubuntu's gcc 4.1 is affected: dnl https://bugs.launchpad.net/ubuntu/+source/gcc-4.1/+bug/109262 AC_MSG_CHECKING([for broken libstdc++ visibility]) @@ -84,10 +89,39 @@ AC_DEFUN([WX_VISIBILITY], CXXFLAGS="$wx_save_CXXFLAGS" LDFLAGS="$wx_save_LDFLAGS"]) AC_MSG_RESULT([$wx_cv_cc_broken_libstdcxx_visibility]) + if test $wx_cv_cc_broken_libstdcxx_visibility = yes; then - AC_DEFINE([HAVE_BROKEN_LIBSTDCXX_VISIBILITY]) + AC_MSG_CHECKING([whether we can work around it]) + AC_CACHE_VAL(wx_cv_cc_visibility_workaround, [ + AC_LANG_PUSH(C++) + AC_TRY_LINK( + [ + #pragma GCC visibility push(default) + #include + #pragma GCC visibility pop + ], + [ + std::string s("hello"); + return s.length(); + ], + wx_cv_cc_visibility_workaround=no, + wx_cv_cc_visibility_workaround=yes) + AC_LANG_POP() + ]) + AC_MSG_RESULT([$wx_cv_cc_visibility_workaround]) + + if test $wx_cv_cc_visibility_workaround = no; then + dnl we can't use visibility at all then + wx_cv_cc_visibility=no + fi fi + fi + if test $wx_cv_cc_visibility = yes; then + AC_DEFINE([HAVE_VISIBILITY]) + if test $wx_cv_cc_broken_libstdcxx_visibility = yes; then + AC_DEFINE([HAVE_BROKEN_LIBSTDCXX_VISIBILITY]) + fi else CFLAGS_VISIBILITY="" CXXFLAGS_VISIBILITY=""