In gcc -w is used to disable all warnings. However in this case I can't enable specific ones (e.g. -Wreturn-type).
Is it possible to disable all warnings, but enable few specific ones?
As a workaround, is there a way to generate list of all -Wno-xxx at once? And will it help? I wouldn't want to do this manually just to find out that it is not equal to -w.
You can use the following command to get an WARN_OPTS variable suitable for injecting directly into your Makefile:
gcc --help=warnings | awk ' BEGIN { print "WARN_OPTS = \\" } /-W[^ ]/ { print $1" \\"} ' | sed 's/^-W/ -Wno-/' >makefile.inject This gives you output (in makefile.inject) like:
WARN_OPTS = \ -Wno- \ -Wno-abi \ -Wno-address \ -Wno-aggregate-return \ -Wno-aliasing \ -Wno-align-commons \ -Wno-all \ -Wno-ampersand \ -Wno-array-bounds \ -Wno-array-temporaries \ : : : -Wno-variadic-macros \ -Wno-vector-operation-performance \ -Wno-vla \ -Wno-volatile-register-var \ -Wno-write-strings \ -Wno-zero-as-null-pointer-constant \ Once that's put in your actual Makefile, simply use $(WARN_OPTS) as part of your gcc command.
It may need a small amount of touch up to:
-Wno-;-Wno-<key>=<value> types; and\ character.but that's minimal effort compared to the generation of the long list, something you can now do rather simply.
When you establish that you want one of those warnings, simply switch from the -Wno-<something> back to -W<something>.
-Wreturn-type(no other warning-related flags), doesn't that do what you want?