codebrainz commented on this pull request.
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+# ============================================================================
Isn't the newer macro to use `AX_CXX_COMPILE_STDCXX` with a wrapper for the specific standard like ` AX_CXX_COMPILE_STDCXX_11`? That's what I've been using the last several years in own projects, I thought this standalone one was deprecated/obsolete or something.