[Bug c++/40918] uncaught_exception() returns wrong (inverted) value if some exception have crossed a DLL boundary before
--- Comment #6 from andriys at gmail dot com 2009-08-04 13:41 --- (In reply to comment #5) I cannot comment on the build of libsdc++.dll in the mingw 4.4.0 release since I have not looked at that source. There is a patch file that is shipped along with the mingw 4.4.0 build instructions/script. The patch adds most of the essential things that the Dave Korn's patch does (i.e. __attribute__((dllimport)) decorations and -no-undefined linker option.) I believe the official MinGW binaries were built with that patch applied. Well, there are your E-mail at the top of that patch file... Applying Dave Korn's patch mentioned in Comment #2, and linking against libstdc++.dll, I get this with your original testcaase: Expecting 'true', got 'true' Expecting 'false', got 'false' Where this patch is supposed to be applied to? trunk? I have looked through the patches you are referring to and through the source in repository. As far as I can see, libsupc++ is still static only, and eh_globals.cc is a part of libsupc++, not libstdc++. The fact that test-case works correctly for you could be just a coincidence. The more reliable way to check for the problem would be to compare the value returned by the __cxa_get_globals() when being from the main executable and from the dll respectively. I'll prepare the new test case. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40918
[Bug c++/40918] uncaught_exception() returns wrong (inverted) value if some exception have crossed a DLL boundary before
--- Comment #7 from andriys at gmail dot com 2009-08-04 13:53 --- Created an attachment (id=18296) -- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18296action=view) Yet another test case This test checks whether main executable and dll share common abi::__cxa_eh_globals structure. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40918
[Bug c++/40918] uncaught_exception() returns wrong (inverted) value if some exception have crossed a DLL boundary before
--- Comment #8 from dannysmith at users dot sourceforge dot net 2009-08-05 04:55 --- (In reply to comment #6) (In reply to comment #5) Applying Dave Korn's patch mentioned in Comment #2, and linking against libstdc++.dll, I get this with your original testcaase: Expecting 'true', got 'true' Expecting 'false', got 'false' Where this patch is supposed to be applied to? trunk? Yes, it against trunk. I have looked through the patches you are referring to and through the source in repository. As far as I can see, libsupc++ is still static only, and eh_globals.cc is a part of libsupc++, not libstdc++. libsupc++ is a convenience lib that is included in libstdc++ The fact that test-case works correctly for you could be just a coincidence. The more reliable way to check for the problem would be to compare the value returned by the __cxa_get_globals() when being from the main executable and from the dll respectively. I'll prepare the new test case. The new test case succeeds when I link against a shared libstdc++. Danny -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40918
[Bug c++/40918] uncaught_exception() returns wrong (inverted) value if some exception have crossed a DLL boundary before
--- Comment #5 from dannysmith at users dot sourceforge dot net 2009-08-02 08:57 --- (In reply to comment #3) I'm linking using g++ driver, so shared libgcc is enabled by default in 4.4.0. I've just tried to enabled shared libstdc++ as described in the Release Notes to the MinGW GCC 4.4.0 release, which made no difference. More over, I modified the test case the following way: I got rid of std::cout in favor of printf(), added -nodefaultlibs option to the linker and specified all the required libraries manually. Now libstdc++ is not linked at all (neither static nor dynamic), the bug is still here. I cannot comment on the build of libsdc++.dll in the mingw 4.4.0 release since I have not looked at that source. However, your revised testcase -- linking against a static libsupc++ -- would be expected to fail. We can have only one instance of the eh_globals structure defined in libsupc++/eh_globals.cc. This is accomplished by linking both the .exe and the .dll against a shared libstdc++. Applying Dave Korn's patch mentioned in Comment #2, and linking against libstdc++.dll, I get this with your original testcaase: Expecting 'true', got 'true' Expecting 'false', got 'false' -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40918
[Bug c++/40918] uncaught_exception() returns wrong (inverted) value if some exception have crossed a DLL boundary before
--- Comment #3 from andriys at gmail dot com 2009-07-31 06:56 --- I'm linking using g++ driver, so shared libgcc is enabled by default in 4.4.0. I've just tried to enabled shared libstdc++ as described in the Release Notes to the MinGW GCC 4.4.0 release, which made no difference. More over, I modified the test case the following way: I got rid of std::cout in favor of printf(), added -nodefaultlibs option to the linker and specified all the required libraries manually. Now libstdc++ is not linked at all (neither static nor dynamic), the bug is still here. I'll attach the modified test case shortly. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40918
[Bug c++/40918] uncaught_exception() returns wrong (inverted) value if some exception have crossed a DLL boundary before
--- Comment #4 from andriys at gmail dot com 2009-07-31 06:58 --- Created an attachment (id=18277) -- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18277action=view) Modified test case (not dependent on libstdc++ at all) -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40918
[Bug c++/40918] uncaught_exception() returns wrong (inverted) value if some exception have crossed a DLL boundary before
--- Comment #1 from andriys at gmail dot com 2009-07-30 20:22 --- Created an attachment (id=18275) -- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18275action=view) Test case -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40918
[Bug c++/40918] uncaught_exception() returns wrong (inverted) value if some exception have crossed a DLL boundary before
--- Comment #2 from dannysmith at users dot sourceforge dot net 2009-07-31 04:18 --- (In reply to comment #0) I was not able to reproduce the bug on Linux, so I assume this is a Windows-specific. If an exception is generated inside shared library (DLL), then crosses the DLL-boundary and gets caught in some other module, the std::uncaught_exception will always return wrong (inverted) value from now on. Here's a small test case. You need to link against a shared libgcc and a shared libstdc++ for this to work. Shared libgcc is part of standard build now for mingw Shared libstdc++ is close. http://gcc.gnu.org/ml/gcc-patches/2009-07/msg01042.html Danny -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40918
