[Bug 205453] 11.0-CURRENT libcxxrt/guard.cc uses C11's _Static_assert in conditionally-compiled C++ code and when it is used buildworld fails for syntax errors in g++ compilers

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205453

--- Comment #1 from Mark Millard <markmi at dsl-only.net> ---
I should also have noted that clang++ can report the __Static_assert syntax as
not-C++ syntax but C11 instead:

# clang++ -Wall -pedantic main.cc
main.cc:2:1: warning: _Static_assert is a C11-specific feature
[-Wc11-extensions]
_Static_assert(1,"Test");
^
1 warning generated.

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