Re: LLVM build warnings

[Maxime Villard <max%m00nbsd.net@localhost>]

Le 13/04/2020 à 00:39, Joerg Sonnenberger a écrit :
> On Sat, Apr 11, 2020 at 01:05:07PM +0200, Maxime Villard wrote:
>> When testing CFLAGS with LLVM, I often hit warnings like this one:
> 
> OK, let's take a step back. What *exactly* are you trying to do?

Well, it's rather simple. Try to build aarch64 with PAC, you get:

	--- libkern.o ---
	building standard kern library
	aarch64--netbsd-clang: error: argument unused during compilation: '-mbranch-protection=pac-ret' [-Werror,-Wunused-command-line-argument]

The Makefile is here:

	https://nxr.netbsd.org/xref/src/sys/arch/aarch64/conf/Makefile.aarch64?r=1.19#46

I want to compile each kernel object with '-mbranch-protection=pac-ret'.

Same warning with BTI enabled. And I've basically had this warning
many times on amd64 when testing new flags.

Thanks,
Maxime