[Bug c/70400] GCC compiles a return statement with an expression in a void function (illegal under C90 6.6.6.4) with -std=c90 -pedantic

[sch...@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70400

--- Comment #1 from Andreas Schwab <sch...@linux-m68k.org> ---
Use -pedantic-errors to turn pedantic diagnostics into errors.