Re: [tip:x86/fpu] x86: Add new static_cpu_has() function using alternatives

[Eric Dumazet <eric.dumazet@gmail.com>]

Le mardi 18 mai 2010 à 13:57 -0700, H. Peter Anvin a écrit :
> On 05/18/2010 01:10 PM, Eric Dumazet wrote:
> > # gcc -v
> > Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.6/specs
> > Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
> > --infodir=/usr/share/info --enable-shared --enable-threads=posix
> > --disable-checking --with-system-zlib --enable-__cxa_atexit
> > --disable-libunwind-exceptions --enable-java-awt=gtk
> > --host=i386-redhat-linux
> > Thread model: posix
> > gcc version 3.4.6 20060404 (Red Hat 3.4.6-10)
> 
> I just implemented a fallback for gcc 3, but the real question is to
> which degree we still care about gcc 3 support for x86 specifically
> (other architectures might have other needs, but this is x86-specific code.)
> 
> Lately the number of issues with gcc 3 support seems to have gone way
> up, and at some point we're going to have to cut it loose -- when would
> depend largely on what the usage case is; e.g. why are you, yourself,
> using gcc 3.4 to compile a state of the art kernel?

I use many different machines to compile kernels, and found this one
using gcc-3.4.6, but still running original 2.6.9.something RHEL
kernel ;)

For kernels I actually boot, I use gcc-4.5, 4.4.x, 4.3.x, 4.2.x, 4.1.2
(cross compiler)