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Is it possible to use apt-build to rebuild the all the OS Fedora optimized for may P3 or for a Pentium-M or Pentium4 and so on ...?
i mean like gentoo does.. you can handle certain variables and pass some flags to the gcc and the make proces so that it will optimize the packages for the architechture specified.
For instance, all i386 packages are optimised for i686 architecture already, but with i386 compatible instruction set. The most important system binaries, e.g. Linux kernel, C Standard Library, OpenSSL, are available optimised for specific architectures, e.g. the glibc i686 package.
Have fun trying to find out in lots of hours of recompiling hundreds of packages, where -fomit-frame-pointer would result in noticable performance increase and not make things worse.
Anyway, it is not my intention to discuss this here and/or refresh what has been beaten to death elsewhere.
But sure, you can modify the default $RPM_OPT_FLAGS in /usr/lib/rpm/redhat/rpmrc, and any package specific ones you find in the src.rpm spec files.
Originally posted by misc Have fun trying to find out in lots of hours of recompiling hundreds of packages, where -fomit-frame-pointer would result in noticable performance increase and not make things worse.
Anyway, it is not my intention to discuss this here and/or refresh what has been beaten to death elsewhere.
But sure, you can modify the default $RPM_OPT_FLAGS in /usr/lib/rpm/redhat/rpmrc, and any package specific ones you find in the src.rpm spec files.
Originally posted by misc Have fun trying to find out in lots of hours of recompiling hundreds of packages, where -fomit-frame-pointer would result in noticable performance increase and not make things worse.
Anyway, it is not my intention to discuss this here and/or refresh what has been beaten to death elsewhere.
But sure, you can modify the default $RPM_OPT_FLAGS in /usr/lib/rpm/redhat/rpmrc, and any package specific ones you find in the src.rpm spec files.
Take a look at the rpmrc file. Several architectures are predefined. You need not change anything if you just wanted to compile a source rpm package specifically for Athlon. You would run "rpmbuild --target athlon --rebuild filename.src.rpm" and get the .athlon.rpm after some time.
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