add Werror/Wall/Wextra

[pmqs]

This change makes the existing cmake & configure workflows match the Werror setting used in the c_std workflow

[madler]

Applied. I thought for sure that everything was going to go to hell, but I got two green check marks!

[pmqs]

Applied. I thought for sure that everything was going to go to hell, but I got two green check marks!

I built it in a fork before pushing here.

[madler]

Thank you! (Actually, I made it more perilous than what you tested by adding a /W3 to the MSVC builds.)

[pmqs]

Thank you! (Actually, I made it more perilous than what you tested by adding a /W3 to the MSVC builds.)

I tried -Wall -Wextra with MSVC, but it outputted as sorts of crazy stuff. Thought prudent to leave well alone.

[pmqs]

@madler Just looking at the CLAGS line committed to develop in configure.yml

        CFLAGS: ${{ matrix.cflags }} -Werror

The one I posted had this, to make cmake.yml, std-c.yml & configure.yml all use the same warnings settings.

        CFLAGS: ${{ matrix.cflags }} -Werror -Wall -Wextra

[madler]

-Wall -Wextra are already there from the --warn option to configure.