Don't use anything higher than march=i486 with Glibc, and personally I would use march=i386. When distributions do it they also patch Glibc to work around the bugs caused by march=i686. Use -mtune=whatever. If you are compiling for size '-march=i386 -mtune=i386' will make smaller programs and libraries because there's less assembly and other code added.
When building GCC use --with-arch=i386 to configure the default march= for gcc after its installed, and use --with-cpu=pentium4 to configure the default mtune=. You can confirm this after gcc is installed by compiling main.c with 'gcc -v'. Command line march= and mtune= will overide this. Use --enable-omitfp in Glibc instead of -fomit-frame-pointer in CFLAGS. It will add -fomit-frame-pointer in appropriate places that won't give bad results from the testsuite, and it will also disable debugging and enable string inlining. It will also add -O99, but you can edit the makefile and change that to -Os if you want. I'm pretty sure 'ld -z combreloc' is the default behavior of recent ld's, I don't think you need to specify it. robert On July 16, 2006 04:07 pm, Wojciech Giel wrote: > >i know what was a problem - opimization: > >I used these flags: > > > >export CHOST="i686-pc-linux-gnu" > >export CFLAGS="-march=pentium4 -Os -fomit-frame-pointer -s -pipe > >-DNDEBUG -DG_DISABLE_ASSERT" > >export CXXFLAGS="-march=pentium4 -Os -s -pipe -DNDEBUG -DG_DISABLE_ASSERT" > >export LDFLAGS="-s -z combreloc" > > > >now after compiling without these flags i get only: > >make[2]: [/sources/glibc-build/posix/annexc.out] Error 1 (ignored) > > > > > >thanks for help > >but why using these flags i get errors?? > > ___________________________________________________________ > To help you stay safe and secure online, we've developed the all new Yahoo! > Security Centre. http://uk.security.yahoo.com
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