gcc -ansi -pedantic -Wall -Wextra ...
No, it's worse:
gcc <various-warning-flags> -Wfatal-errors
i.e. it stops at the first warning. In practice, this means that you get to fix/suppress the first warning your program causes, then start it over again to fix/suppress the second, etc., rather than getting a list of all of them and deciding what to do.
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