Hi, There was recent mention here: http://lists.freebsd.org/pipermail/freebsd-current/2005-April/049165.html by Kirill Ponomarew that GCC 4.0 would be a good thing to look at for inclusion in the base FreeBSD system. Just out of curiousity, I tried to compile a GENERIC kernel from -CURRENT, and wanted to see how many things would break (because knowing GCC, I knew things would break :). I used the following compiler from ports: gcc version 4.0.1 20050423 (prerelease) [FreeBSD] The pruned down results of what I got are Approx. 70 errors: http://people.freebsd.org/~rodrigc/gcc4.0_fbsdkernel_errors.txt Approx. 2700 warnings, converted to errors by -Werror: http://people.freebsd.org/~rodrigc/gcc4.0_fbsdkernel_warnings.txt I found a few changes in compiler flags with gcc 4.0: (1) The compiler complains that "-I-" is deprecated and that you should use "-iquote DIR" instead. I changed it in src/sys/conf/kern.pre.mk (2) "-mno-align-long-strings" seems to be gone and gives an error if you use it. I commented it out of src/sys/conf/kern.mk (3) "-fformat-extensions" is a FreeBSD extension that is in the FreeBSD system gcc compiler, but not the FSF/ports gcc compiler. I commented it out of /usr/share/mk/bsd.kern.mk There were a lot of warnings (especially in the CAM layer, but in other places too) of the type: /usr/src/sys/cam/cam_periph.c:640: warning: pointer targets in assignment differ in signedness I don't know if these are legitimate things that should be addressed, or if GCC 4.0 is being needlessly pedantic. I did not bother to try to compile any FreeBSD userland or ports. >From what I can tell, a lot of things break with GCC 4.0, so I can't tell if it performs better than GCC 3.4 or not. -- Craig Rodrigues rodrigc_at_crodrigues.orgReceived on Tue May 24 2005 - 01:46:15 UTC
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