[Bug 276738] clang: static_assert conflicts with -std=c++98 -pedantic-errors

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276738

--- Comment #2 from Henri Menke <henri@henrimenke.de> ---
Created attachment 248087
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=248087&action=edit
Dockerfile

Thanks for taking a look. While the documentation states that it targets mainly
C++11 and above it doesn't say anywhere explicitly that C++98 is unsupported.
In fact, there is a subpage on the extended C++03 support in libc++:
https://libcxx.llvm.org/DesignDocs/ExtendedCXX03Support.html

The reason why I believe that this is a bug in FreeBSD, is that using upstream
clang-17 with the exact same example on a Linux system does not produce the
error (see Dockerfile attached).

Finally I'd like to point out that this problem has been reported on other
issue trackers as well:
https://github.com/google/benchmark/issues/1593
https://github.com/Mbed-TLS/mbedtls/issues/3693
https://stackoverflow.com/questions/70848614/getting-static-assert-is-a-c11-specific-feature-with-std-c99-on-freebsd

However, if you decide that C++98 with libc++ is unsupported on FreeBSD, please
patch clang to throw an appropriate error message.

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