Re: [C++ Patch] PR 38980

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,
> Instead of adding the parameter, let's have the C++ front end call a 
> different function that doesn't try to pull out the value from 
> aggregate variables, like C has decl_constant_value_for_optimization.
Ok. The below lives entirely inside the C++ front-end (actually I had 
already experimented with something similar)

Note I'm using the name decl_constant_value_safe, thus I'm not 
overloading the name decl_constant_value_for_optimization, because the 
latter is only used by the C front-end but still exported by c-family. I 
could move back that decl_constant_value_for_optimization currently in 
c-common.c to the C front-end, but callers, also C front-end only, would 
remain in c-family. I'd rather not fiddle further with all of that 
(looks like long term people would like to have more shared code in 
c-common.c, seems indeed an excellent idea, but at the moment large 
chunks are actually used by the C front-end only...).

Tested x86_64-linux.

Paolo.

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