[SOLVED] Compiler option make error warning after -Wall -Werror

Issue

-Wall -Werror are already set. I need to add some flag to make unused-s not error but warning. -Wno-unused discards warnings at all. I want to see warning and succeed compilation. How?

I tried: -Werror=no-unused but it does not work. GCC 9.

Solution

From the GCC manual:

-Werror=

Make the specified warning into an error. The specifier for a warning is appended; for example -Werror=switch turns the warnings controlled by -Wswitch into errors. This switch takes a negative form, to be used to negate -Werror for specific warnings; for example -Wno-error=switch makes -Wswitch warnings not be errors, even when -Werror is in effect.

So the option you want to pass is -Wno-error=unused.

Answered By - Ruslan