PATCH: Run V3 tests on installed compiler

[Mark Mitchell]

Paolo Carlini wrote:
> Mark Mitchell wrote:
> 
>> Any objections?
>>  
>>
> No objections, but I wonder how this work relates to libstdc++/20451. 
> For instance, is the current behavior unchanged on multilib-bed systems?

At present, there is no change.

However, this is a special case of the principle that non-installed 
objects using during the test process must in fact be built during the 
test process.  At I noted, I haven't yet done that for the .po files -- 
but I will, and then this problem will go away.

-- 
Mark Mitchell
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