On Sun, 12 Dec 2010 13:09:08 -0500 ross smith <r...@umich.edu> wrote:
> Perhaps something along the lines of: If CPU_FLAGS is empty or not defined, > set flags based on the -march and -mtune variables. If CPU_FLAGS is set, > respect what has been set there and ignore the other logic for defaults. -march flags are the lowest common denominator for an architecture. For example, core2 enables MMX, SSE, SSE2, SSE3, and SSSE3 while a Core i7 processor also supports SSE4.1, SSE4.2, and AES instructions. It might be useful to use -march as a base and leave it up to the user to set any additional flags, but I don't see how that is any different than what we have now. In addition it would require us to maintain accurate mappings of what -march enables what flags and deal with the fact that these flags may not exist between gcc versions. It also falls apart with -march=native. -- fonts, gcc-porting, it makes no sense how it makes no sense toolchain, wxwidgets but i'll take it free anytime @ gentoo.org EFFD 380E 047A 4B51 D2BD C64F 8AA8 8346 F9A4 0662
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