http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46942
--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2010-12-14 17:26:11 UTC --- If the conclusion is that the callee can rely on the caller having done the extension then you need to watch out for security issues in the kernel syscall ABI when building with a compiler that generates code relying on this. http://lkml.org/lkml/2007/6/4/376 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0029 If there were target-specific aspects to the fix to that security issue, they may not have included x86_64 changes.
