
Am 14.02.2011 09:16, schrieb Adrian Schröter:
Am Samstag, 12. Februar 2011, 22:38:05 schrieb Cristian Morales Vega:
I have a program with a build system that adds "-mfpmath=sse -msse" to the CFLAGS. What do you think, should I patch it? And if it used -mmmx (gcc calls "i586" to a Pentium without MMX)?
If it is for a i586.rpm, you need to patch it in any case to not use these flags. Because the binaries would not be runable on a i586 system.
If these optimizations would speed up the code (this is not the case for most packages), you may build the libs a second time and put them below
/usr/lib/sse2
directory (sse3 path is afaik not yet supported). The dynamic linker will look there first, if the hardware supports it.
So the package is still runable on plain i586, but uses performance boost on newer 32bit hardware. (However, one could argue that fast systems are anyway 64bit these days and it is not worth the hazzle ...)
BTW. Can wrong usage of those flags be detected via post-build-checks or rpmlint? I could imagine that they may be used w/o being noticed by the packager. Wolfgang -- To unsubscribe, e-mail: opensuse-packaging+unsubscribe@opensuse.org For additional commands, e-mail: opensuse-packaging+help@opensuse.org