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

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

--- Comment #3 from Henri Menke <henri@henrimenke.de> ---
I have narrowed this down a bit more. The following code doesn't preprocess
correctly

#include <cassert>
//#undef _Static_assert
static_assert(random_template<int, char>, "oops");

When running the preprocessor (with -E) I get

$ c++ -std=c++98 -pedantic-errors -E test.cpp >/dev/null
test.cpp:3:43: error: too many arguments provided to function-like macro
invocation
    3 | static_assert(random_template<int, char>, "oops");
      |                                           ^
/usr/include/sys/cdefs.h:282:9: note: macro '_Static_assert' defined here
  282 | #define _Static_assert(x, y)    __Static_assert(x, __COUNTER__)
      |         ^
1 error generated.

If I uncomment the #undef _Static_assert it preprocesses correctly and upon
compiling it gives the expected compiler error that static_assert is not
available.

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