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it would be nice if they provided a gcc-ancient-compat or something though it's easy enough to create an alias with the correct flags.

-std=gnu98 works. ie explicitly telling it your code is not modern C.

The new flags apply regardless of -std value, as does -fno-common

Uhh no they don't, and it's explicitly documented under https://gcc.gnu.org/gcc-14/porting_to.html in "Turning errors back into warnings".

Futher more every warning Explains why the std value affects them.