Comment by Terr_

Disclosure: I've got zero C/C++ on my resume. I was asked to diagnose a kernel panic and backport kernel security patches once, but it was very uncomfortable. ("Hey, Terr knows the build system, that's close enough, right?")

That said, perhaps something like disabling the default -fextended-identifiers [0], and enabling the -Wbidi-chars [1] warning.

[0] https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html...

[1] https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#inde...