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SubjectPATCH] Use -mpreferred-stack-boundary=3 on x86-64 if supported
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Hi,

-mpreferred-stack-boundary=3 can be used on x86-64 with GCC 4.8.0:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53383

I backported it to hjl/x32/gcc-4_7-branch branch at

http://gcc.gnu.org/git/?p=gcc.git;a=summary

http://gcc.gnu.org/git/?p=gcc.git;a=commit;h=96828b1f869a31e3a1227afa420b8f28e71
e006c

This patch uses -mpreferred-stack-boundary=3 on x86-64 if it is supported.
I have been running 3.4 kernel compiled with this option for weeks.


H.J.
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