[Bug target/120933] Turn on -mtls-dialect=gnu2 by default on x86-64

[hjl.tools at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120933

--- Comment #17 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Sam James from comment #16)
> Created attachment 62182 [details]
> 0001-i386-default-to-mtls-dialect-gnu2-if-appropriate.patch
> 
> Fixed patch.

Can you use a single .S file with "#ifdef __x86_64__" to check glibc/linker
support?