[C++ Patch] PR 54216

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

Hi,

this issue is about some enumeration types which are strictly speaking 
illegal and we are accepting nonetheless:

enum {}; //-std=c++98 or -std=c++11

enum class {}; //-std=c++11

enum class { x }; //-std=c++11

I suppose we want to be less strict about the former thus I'm using a 
pedwarn instead of an error. Not sure about the best wording of the 
warning/error messages.

Anyway, luckily only one existing testcase needs adjusting, I thought we 
had many, in the library too (in fact now I seem to remember I fixed 
some anonymous enum uses)

Tested x86_64-linux.

Thanks,
Paolo.

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