Aaron Ballman d781ac1cf0 [C23] Add __builtin_c23_va_start (#131166) ...

This builtin is supported by GCC and is a way to improve diagnostic
behavior for va_start in C23 mode. C23 no longer requires a second
argument to the va_start macro in support of variadic functions with no
leading parameters. However, we still want to diagnose passing more than
two arguments, or diagnose when passing something other than the last
parameter in the variadic function.

This also updates the freestanding <stdarg.h> header to use the new
builtin, same as how GCC works.

Fixes #124031

2025-03-15 11:01:53 -04:00

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