feat(ci): add an option to fail on compile warning

[ananta]

Add optional flags to the build system[make and CMake] to fail upon compile warnings. These flags are disabled by default so that during the development this does not interfere.

fix #3899

[cebtenzzre]

I think you are cherry-picking from master when you should be merging from it or rebasing on it.

[cebtenzzre]

There's no need to close the PR, just fix whatever you need to on your end (e.g. making a new branch, putting your changes on it without the extra commits, then checking out this branch again and running git reset --keep new-branch) and then force-push.

[ggerganov]

Will merge this after the CI is green

[slaren]

I don't think this works correctly with GNU systems, make prints this:

expr: syntax error: unexpected argument ‘070100’
expr: syntax error: unexpected argument ‘080100’

[slaren]

It looks like CC_VER is not set. Originally the PR had this code to set it, but it was removed at some point:

ifeq '' '$(findstring clang,$(shell $(CC) --version))'
	CC_IS_GCC=1
	CC_VER := $(shell $(CC) -dumpfullversion -dumpversion | awk -F. '{ printf("%02d%02d%02d", $$1, $$2, $$3) }')
else
	CC_IS_CLANG=1
	ifeq '' '$(findstring Apple LLVM,$(shell $(CC) --version))'
		CC_IS_LLVM_CLANG=1
	else
		CC_IS_APPLE_CLANG=1
	endif
	CC_VER := $(shell $(CC) --version | sed -n 's/^.* version \([0-9.]*\).*$$/\1/p' \
				| awk -F. '{ printf("%02d%02d%02d", $$1, $$2, $$3) }')
endif