mingw-4.2 requires shared lib{gcc,stdc++} for cross-dll exceptions

[Michael Hofmann]

Binary package hint: mingw32

mingw32 (4.2.1.dfsg-1ubuntu1 on Hardy) compiled on Debian/Ubuntu does not include the shared versions of libgcc and libstdc++. This is necessary for cross-DLL exceptions and a regression from the packages in Gutsy (gcc 3.4), where no shared libraries were necessary for this functionality.

[Michael Hofmann (mh21)]

A fixed version that works for me can be found in my ppa at http://ppa.launchpad.net/mh21/ubuntu/.

[Andrea Colangelo (warp10)]

Subscribing ubuntu-universe-sponsors

[Matthias Klose (doko)]

this is based on 4.2.1, is there a 4.2.3 version available?

[Michael Hofmann (mh21)]

As far as I know that latest released gcc for mingw is 4.2.1
(http://sourceforge.net/project/showfiles.php?group_id=2435).

[Andrea Colangelo (warp10)]

Unsubscribing u-u-s, since there is no valid debdiff we can push into archives. Please, re-subscribe when a debdiff is available.

[Michael Hofmann (mh21)]

Could you please tell me what the problem is with the provided debdiff?

[Michael Hofmann (mh21)]

Resubscribing u-u-s as discussed on #ubuntu-devel.

[Luca Falavigna (dktrkranz)]

Could you please describe a test case such as example scripts, compilation instructions or whatever can be useful to review your debdiff? Thanks.

[Michael Hofmann (mh21)]

The attached tar file contains a test case:
- unpack with "tar -xzf mingw-shared-dll-testcase.tgz"
- make with "make"
- run the test cases:
  - ./main - linux test case, prints "Exception: catch me"
  - ./main.exe (uses wine) - statically linked runtime library, should print "Exception: catch me", but fails with "terminate called after throwing a..."
  - ./main-shared.exe (uses wine) - dynamically linked runtime library, prints "Exception: catch me"
  - ./main-shared2.exe (uses wine) - dynamically linked runtime and stdc++ library, prints "Exception: catch me", is a bit smaller

I'm not 100% sure that the dynamic linking to the stdc++ library (for main-shared2.exe) is done correctly in the example, because the reduction in executable size is less than what I would expect.
Nevertheless, it really is a bit smaller, depends on the stdc++ DLL and works as expected, so maybe I'm just paranoid.

[Luca Falavigna (dktrkranz)]

I get this error trying to compile your test case:

dktrkranz@utumno:~$ make
g++ -fPIC -shared library.cpp -o liblibrary.so
g++ -Wl,-rpath,. -L. -llibrary main.cpp -o main
i586-mingw32msvc-g++ -shared library.cpp -o liblibrary.dll
i586-mingw32msvc-g++ -L. -llibrary main.cpp -o main.exe
i586-mingw32msvc-g++ -shared library.cpp -shared-libgcc -o liblibrary-shared.dll
/usr/lib/gcc/i586-mingw32msvc/4.2.1-sjlj/../../../../i586-mingw32msvc/bin/ld: cannot find -lgcc_s
collect2: ld returned 1 exit status
make: *** [liblibrary-shared.dll] Error 1
dktrkranz@utumno:~$

[Iain Lane (laney)]

Unsubscribing sponsors. Please resubscribe once the issues have been overcome. Thanks :)

[Michael Hofmann (mh21)]

Updated Makefile. Use "make unix static dynamic" if you use the updated package, and "make unix static" if you use the intrepid package (which does not provide dynamic linking to the standard library). Resubscribing sponsors.

[Benjamin Drung (bdrung)]

With the updated Makefile this patch works. I have updated the target distribution to lucid, updated the timestamp, and uploaded the package. Sorry for the long delay and thanks for the patch.

[Launchpad Janitor (janitor)]

This bug was fixed in the package mingw32 - 4.2.1.dfsg-1ubuntu2

---------------
mingw32 (4.2.1.dfsg-1ubuntu2) lucid; urgency=low

  * Build shared libgcc and libstdc++ libraries (LP: #195407).
 -- Michael Hofmann <email address hidden> Sun, 03 Jan 2010 02:24:27 +0100

[Michael Hofmann (mh21)]

Thanks Benjamin!