MinGW GCC 4.8
Summary
Update the mingw-gcc cross-compiler to gcc 4.8 and rebuild all MinGW packages against it
Owner
- Name: Erik van Pienbroek
- Email: epienbro@fedoraproject.org
Current status
- Targeted release: Fedora 19
- Last updated: 2013-01-26
- Percentage of completion: 50%
Detailed Description
The Fedora MinGW SIG maintains over a large number of packages which allows users to build binaries for the win32 and win64 targets using the mingw-w64 toolchain. One of the goals of the Fedora MinGW SIG is to have the package versions as close as possible to their native counterparts: https://fedoraproject.org/wiki/Packaging:MinGW?rd=Packaging/MinGW#Track_Fedora_native_package_versions As gcc 4.8 was accepted as a feature for Fedora 19 we intend to update the mingw-gcc package in Fedora 19 as well to gcc 4.8
Benefit to Fedora
See http://gcc.gnu.org/gcc-4.8/changes.html for the list of changes
Scope
The introduction of mingw-gcc 4.8 can be split in the following sub-tasks:
- Update mingw-gcc to version 4.8 in a local environment done
- Perform a test mass rebuild against this updated mingw-gcc package done, results
- Identify build failures done, results
- Resolve build failures in progress, 2 packages remaining, mingw-qpid-cpp and wine-mono
- Introduce mingw-gcc 4.8 in rawhide
- Rebuild all mingw-* packages which depend on libgcc_s_sjlj-1.dll (upstream switched to SEH exception handling for the win64 target by default)
- Have all other mingw-* packages rebuild by the mass rebuild which will start on February 1 2013
How To Test
The Fedora MinGW SIG maintains a testsuite which performs regression testing. Other tests can be done by building packages against it and testing out the compiled results on native win32/win64 environments or by using wine.
User Experience
Users will be able to see compiled code improvements and use the newly added features, such as improved C++11 and C11 support, improved vectorization support, etc.
Dependencies / Affected packages
All mingw-* packages and wine-mono need to be rebuild after mingw-gcc 4.8 is introduced in rawhide.
The list of packages which need to be rebuild directly after the introduction of mingw-gcc 4.8 to prevent broken dependencies are:
$ repoquery --whatrequires 'mingw64(libgcc_s_sjlj-1.dll)' --disablerepo=\* --enablerepo=rawhide --source | sort | uniq mingw-antlr-2.7.7-10.fc18.src.rpm mingw-atkmm-2.22.6-5.fc18.src.rpm mingw-boost-1.50.0-1.fc19.src.rpm mingw-cairomm-1.10.0-8.fc18.src.rpm mingw-clucene-2.3.3.4-5.fc19.src.rpm mingw-cximage-600-7.fc19.src.rpm mingw-enchant-1.6.0-7.fc19.src.rpm mingw-glibmm24-2.34.1-1.fc18.src.rpm mingw-gmp-5.0.5-1.fc19.src.rpm mingw-gnutls-2.12.21-2.fc19.src.rpm mingw-gtkmm24-2.24.2-7.fc18.src.rpm mingw-gtkmm30-3.6.0-1.fc18.src.rpm mingw-harfbuzz-0.9.9-2.fc19.src.rpm mingw-hunspell-1.3.2-8.fc19.src.rpm mingw-icu-49.1.2-1.fc19.src.rpm mingw-libsigc++20-2.2.11-1.fc18.src.rpm mingw-libsqlite3x-20071018-17.fc19.src.rpm mingw-libxml++-2.36.0-1.fc18.src.rpm mingw-pangomm-2.28.4-4.fc18.src.rpm mingw-pcre-8.31-1.fc19.src.rpm mingw-polyclipping-5.0.3-3.fc19.src.rpm mingw-pthreads-2.8.0-22.20110511cvs.fc18.src.rpm mingw-qt-4.8.4-1.fc19.src.rpm mingw-qwt-6.0.1-1.fc19.src.rpm mingw-webkitgtk-1.10.2-2.fc19.src.rpm mingw-webkitgtk3-1.10.2-2.fc19.src.rpm mingw-wxWidgets-2.8.12-12.fc19.src.rpm mingw-zfstream-20041202-15.fc19.src.rpm
These packages need to be rebuild directly because gcc upstream decided to use SEH exception handling by default for the win64 target. The library libgcc_s_sjlj-1.dll is replaced with libgcc_s_seh-1.dll for the win64 target. Therefore all packages which used to depend on libgcc_s_sjlj-1.dll need to be rebuild so they start using libgcc_s_seh-1.dll instead
Contingency Plan
In a worst-case situation then the old mingw-gcc package can be reintroduced and all mingw packages need to be rebuild another time against this older gcc
Documentation
http://gcc.gnu.org/gcc-4.8/changes.html