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Revision as of 17:52, 29 January 2009
gcc 4.4
Summary
Switch GCC in Fedora 11 to 4.4.x, rebuild all packages with it.
Owner
- Name: Jakub Jelinek
- email: jakub@redhat.com
Current status
- Targeted release: Releases/11
- Last updated: (DATE)
- Percentage of completion: 70%
Detailed Description
GCC 4.4.0 is going to be released soon (has been frozen for regression/documentation bugfixes only since November, 1st). Initial packages are prepared in dist-f11-gcc44. I'd also like to change default ISA and tuning flags for several architectures, -march=i586 -mtune=generic from -march=i386 -mtune=generic for i?86, -march=z9-109 -mtune=z10 for s390{,x} and -march=power4 for powerpc -m64.
Benefit to Fedora
See http://gcc.gnu.org/gcc-4.4/changes.html for the list of changes. It features a new, rewritten, register allocator and a bunch of other improvements.
Scope
All packages should be rebuilt with the new gcc once it hits dist-f11.
How To Test
GCC has its own testsuite, which is run during the package build, plus many other packages with automated tests also help to test the new gcc.
User Experience
Users will be able to see compiled code improvements and use the newly added features, such as improved C++0x support etc.
Dependencies
All packages need to be rebuilt.
Contingency Plan
If bugs are discovered, I'd appreciate help from the package owners in preparing self-contained testcases to speed up analysis and fixing the bugs. Don't have time to debug issues in 8000+ packages, especially when in many cases it could be caused by undefined code in the packages etc. I don't expect we'll have to fall back to the older gcc.
Documentation
http://gcc.gnu.org/gcc-4.4/changes.html
Release Notes
Fedora 11 comes with GCC 4.4.0 as primary compiler, see http://gcc.gnu.org/gcc-4.4/changes.html for user visible changes in it.
Comments and Discussion