Bug 131442 – Xen refuses to install because of -mfpmath=387

• Product: Gentoo Linux
• Status: RESOLVED INVALID

[Description Garrett Cooper 2006-04-27 06:46:20 UTC]

Just thought you guys should know...

cc1: warnings being treated as errors
kernel.c:1: warning: 387 instruction set disabled, using SSE arithmetics
make[3]: *** [kernel.o] Error 1
make[3]: Leaving directory `/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/common'
make[2]: *** [/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/common/built_in.o] Error 2
make[2]: Leaving directory `/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/arch/x86'
make[1]: *** [/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen/xen] Error 2
make[1]: Leaving directory `/var/tmp/portage/xen-3.0.2/work/xen-3.0.2/xen'
make: *** [install-xen] Error 2

!!! ERROR: app-emulation/xen-3.0.2 failed.
!!! Function src_install, Line 61, Exitcode 2
!!! install failed
!!! If you need support, post the topmost build error, NOT this status message.

sprsd gcooper # emerge --info | grep 387
CFLAGS="-O3 -march=pentium4 -mtune=pentium4 -mmmx -msse -msse2 -mfpmath=sse,387 -momit-leaf-frame-pointer -ftracer -fforce-addr -funroll-loops -pipe"
CXXFLAGS="-O3 -march=pentium4 -mtune=pentium4 -mmmx -msse -msse2 -mfpmath=sse,387 -momit-leaf-frame-pointer -ftracer -fforce-addr -funroll-loops -pipe -fvisibility-inlines-hidden"

[Comment 1 Jakub Moc (RETIRED) 2006-04-27 06:57:39 UTC]

Thanks. Feel free to remove it from your C[XX]FLAGS. -fvisibility-inlines-hidden is a good candidate for removal as well. ;)

<snip>
sse,387
Attempt to utilize both instruction sets at once.  This effectively double the amount of available registers and on chips with separate execution units for 387 and SSE the execution resources too.  Use this option with care, as               it is still experimental, because the GCC register allocator does not model separate functional units well resulting in instable performance.
</snip>