[Bug preprocessor/107794] can't use the string "linux-" via stringizing in the preprocessor

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107794

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
"linux" is a predefined macro. Compile with -std=c17 instead of the default
-std=gnu17 to disable that.

See https://gcc.gnu.org/onlinedocs/cpp/System-specific-Predefined-Macros.html