dmpolukhin wrote:
abi_tags were implanted for compatibility with GCC so it is the canonical
implementation in this particular case. Diagnostic from this PR will be emitted
for libstdc++'s own idiom: c++config.h tags __cxx11 once, and
_GLIBCXX_BEGIN_NAMESPACE_CXX11 is a bare `namespace __cxx11 {` - and I don't
think it should be flagged. I do see value diagnostic you implementsed in this
PR but only for the cases when abi_tag added after there were used so new tags
will be ignored (I haven't implemented this part), see #224826. It is indeed
much bigger and changes ABI with command line option for backward compatibility.
https://github.com/llvm/llvm-project/pull/221039
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