Re: [PATCH v4 1/2] Makefile: infer --target from ARCH for CC=clang

[Linus Torvalds]

On Fri, Jul 30, 2021 at 1:17 PM Nick Desaulniers
<ndesaulniers@xxxxxxxxxx> wrote:
>
> +ifeq ($(SRCARCH),arm)
> +CLANG_FLAGS    += --target=arm-linux-gnueabi
..,.

Ugh.

A wise man once said: "All problems in computer science can be solved
with another level of indirection".

Just do it like this:

   CLANG_TARGET_FLAGS_arm = arm-linux-gnueabi
   CLANG_TARGET_FLAGS_hexagon = hexagon-linux-gnu
   ..
   CLANG_TARGET_FLAGS = $(CLANG_TARGET_FLAGS_$(ARCH))

Which is a lot denser and simpler.

And then the only if-statement can be something along the lines of

   ifeq ($(CLANG_TARGET_FLAGS),)
   $(error Specify clang target flags)
   else
   CLANG_FLAGS    += --target=$(CLANG_TARGET_FLAGS)
   endif

Plus add *random handwaving* about all the details for CROSS_COMPILE
and friends.

            Linus