Re: [PATCH v11 01/12] add support for Clang's Shadow Call Stack (SCS)

Steven Rostedt
2020-04-21T01:12:10Z

On Mon, 20 Apr 2020 18:17:28 +0100
Will Deacon <will@kernel.org> wrote:

> > +ifdef CONFIG_SHADOW_CALL_STACK
> > +CC_FLAGS_SCS := -fsanitize=shadow-call-stack
> > +KBUILD_CFLAGS += $(CC_FLAGS_SCS)
> > +export CC_FLAGS_SCS
> > +endif
>
> CFLAGS_SCS would seem more natural to me, although I see ftrace does it this
> way.

The CC_FLAGS_FTRACE was added by Heiko Carstens, and the "CC_FLAGS_"
appears to be a common usage in s390 :-)

That said, I like the CC_FLAGS_ notation, because the Linux build
system uses CFLAGS_* as commands:

CFLAGS_foo.o = x
CFLAGS_REMOVE_foo.o = y

And "CC_FLAGS_" is only for new flags and easy to search for.

-- Steve