[C++ Patch] PR 58647

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

Hi,

this ICE on valid, [4.7/4.8/4.9 Regression], happens only with 
-std=c++11 and is quite simple to analyze: cxx_eval_constant_expression 
sees a COMPONENT_REF and forwards to cxx_eval_component_reference, but 
the latter, evidently, only handles "fields" not functions (per the 
comment) and an ICE soon happens when it tries to use DECL_MUTABLE_P.

If, for comparison, instead of a static member function, we have a 
static free function, like in, eg

static void foo();

template<typename> void bar()
{
  foo;
}

what happens is that cxx_eval_constant_expression sees a FUNCTION_DECL 
and returns it as-is. Thus I believe that doing the same in the case at 
issue should be fine.

Tested x86_64-linux.

Thanks,
Paolo.

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Attachment: patch_58647
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