[Bug libc/12123] SIGBUS on strstr_sse42 due to bad alignment

["viriketo at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12123

--- Comment #20 from LluÃs Batlle <viriketo at gmail dot com> 2010-10-28 20:10:04 UTC ---
(In reply to comment #19)
> (In reply to comment #18)
> > (In reply to comment #15)
> > > strstr.os was compiled with -mpreferred-stack-boundary=2 which implies
> > > -mincoming-stack-boundary=2, so it is a compiler bug if it assumes bigger
> > > alignment.
> > 
> > I see '-mincoming-stack-boundary' appears only in gcc 4.4. Is gcc 4.4 a
> > requirement for building glibc?
> > 
> > (In reply to comment #17)
> > We use gcc 4.3 to build glibc in i686-linux, and we use gcc 4.5.1 to build
> 
> You need gcc 4.4 or above to properly align the stack in 32bit.

Ok, thank you. I see.
I tried building glibc with gcc 4.5.1, and strstr_sse42 starts properly:
  1121d0:       55                      push   %ebp
  1121d1:       89 e5                   mov    %esp,%ebp
  1121d3:       83 e4 f0                and    $0xfffffff0,%esp

Couldn't the configure script check the gcc version? Otherwise gcc 4.3 silently
builds a broken glibc.

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