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Since the warning options are fairly descriptive on their own (apart
from the -w option, which inhibits all warning options),
they're listed here without any descriptions; you can find out what
each of them do in Warnings.
-pedantic, -pedantic-errors, -Wall,
-Wimplicit-int, -Wimplicit-function-declaration,
-Wimplicit, -Wmain, -Wreturn-type,
-Wunused, -Wswitch, -Wcomment,
-Wformat, -Wchar-subscripts,
-Wuninitialized, -Wparentheses