RFA: PATCH to ipa-devirt for c++/58678

Jason Merrill jason@redhat.com
Thu Sep 11 02:07:00 GMT 2014


On 09/10/2014 06:47 PM, Jan Hubicka wrote:
> Again - I think main problem is that we provide a middle end a function body
> that it is not allowed to use.  We do not really have a concept of function
> definitions that we may not use and worse yet, we are preventing that just in
> one special case - i.e. in the speculative devirtualization.

Because that special case is the only time we want to prevent it, as I 
argued in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58678#c19

My patch shouldn't change any behavior except for fixing this LTO bug, 
since implicitly-declared member functions always have vague linkage. 
It seems to me a simple, safe fix.

Jason



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