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[gold][PATCH] PR gold/14608: --detect-odr-violations doesn't work with GCC 4.7 and newer

Cary Coutant ccoutant@google.com
Mon Dec 22 17:51:00 GMT 2014 
> The debug_msg test has 2 implementations of SometimesInlineFunction:
>
> int SometimesInlineFunction(int i) { return i; }
> int SometimesInlineFunction(int i) { return i * i; }
>
> and One Definition Rule (ODR) violation detection expects they will be
> compiled into functions of different sizes.  Hower, on x86, GCC 4.7 and
> newer compile them into functions of the same size and ODR violation
> detection test fails.  This patch changes
>
> int SometimesInlineFunction(int i) { return i; }
>
> to
>
> int SometimesInlineFunction(int i) { return i * i * 3; }
>
> so that it will be compiled into a function of larger size.  Tested on
> x86, x86-64 and x32.  Hopefully, it works on other targets.  I checked
> it in as an obvious fix.
>
> H.J.
> ---
>         PR gold/14608
>         * testsuite/debug_msg.cc (SometimesInlineFunction): Changed
>         to "return i * i * 3;".

Thanks. I haven't seen this with GCC 4.8 on x86_64. The first,
compiled with -O0, has a size of 12, and the second, compiled with
-O2, has a size of 6.

-cary
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