On 00:30 Mon 15 Nov , Diego Elio Pettenò wrote: > Il giorno dom, 14/11/2010 alle 22.03 +0100, Thomas Kahle ha scritto: > > I have a package (sci-libs/mpir) whose configure supports building of > > fat binaries with both x86 and amd64 assembler in the binary. > > Oh the heck are they implemented? If they are FatELF, no they shouldn't > be used, ever, full stop.
They don't tell. From the manual: Fat binary, ‘--enable-fat’ Using ‘--enable-fat’ selects a “fat binary” build on x86 or x86 64 systems, where optimized low level subroutines are chosen at runtime according to the CPU de- tected. This means more code, but gives reasonable performance from a single bi- nary for all x86 chips, or similarly for all x86 64 chips. (This option might become available for more architectures in the future.) Cheers, Thomas -- Thomas Kahle http://dev.gentoo.org/~tomka/
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