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check whether compiler supports visibility pragmas used for broken libstdc++ visibility workaround and don't use visibility at all if it doesn't (which is the case for icc)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@48852 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2007-09-21 10:50:13 +00:00
parent 73862e49f4
commit c9bd045b24
2 changed files with 129 additions and 11 deletions
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35
build/aclocal/visibility.m4
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@@ -64,8 +64,8 @@ AC_DEFUN([WX_VISIBILITY],
CXXFLAGS="$wx_save_CXXFLAGS"])
AC_MSG_RESULT([$wx_cv_cc_visibility])
if test $wx_cv_cc_visibility = yes; then
AC_DEFINE([HAVE_VISIBILITY])
dnl we do have basic visibility support, now check if we can use it:
dnl
dnl Debian/Ubuntu's gcc 4.1 is affected:
dnl https://bugs.launchpad.net/ubuntu/+source/gcc-4.1/+bug/109262
AC_MSG_CHECKING([for broken libstdc++ visibility])
@@ -89,10 +89,39 @@ AC_DEFUN([WX_VISIBILITY],
CXXFLAGS="$wx_save_CXXFLAGS"
LDFLAGS="$wx_save_LDFLAGS"])
AC_MSG_RESULT([$wx_cv_cc_broken_libstdcxx_visibility])
if test $wx_cv_cc_broken_libstdcxx_visibility = yes; then
AC_MSG_CHECKING([whether we can work around it])
AC_CACHE_VAL(wx_cv_cc_visibility_workaround, [
AC_LANG_PUSH(C++)
AC_TRY_LINK(
[
#pragma GCC visibility push(default)
#include <string>
#pragma GCC visibility pop
],
[
std::string s("hello");
return s.length();
],
wx_cv_cc_visibility_workaround=no,
wx_cv_cc_visibility_workaround=yes)
AC_LANG_POP()
])
AC_MSG_RESULT([$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=""