How to tune gcc for different x86 host and target cpus?

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Hello,

as far as I understand, when building gcc, I can use --with-arch=pentium to tell configure that the resulting compiler should emit code optimized for pentium processors.

But how can I tell the configure script that the compiler itself should be optimized for a different cpu architecture?

Example #1: Host and build are athlon-xp, target should be pentium.

Example #2: Build is pentium4, Host should be pentium-mmx, target should be 386.

What configure options should I use? (Host, build and target are all linux systems, but I think this apply to every system with x86 processor variants?)

Michael Roth


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