cmake: llvm: fix --config param

[DatGizmo]

This fixes 'error: unknown argument: '--config/home/ncs/toolchains/86896046f0/opt/zephyr-sdk/cmake/zephyr/llvm/clang_compiler_rt.cfg

Signed-off-by: Sebastian Wezel [email protected]

[DatGizmo]

During testing of the 0.18.0-alpha2 toolchaing with clang I encounters following build error.

error: unknown argument: '--config/home/ncs/toolchains/86896046f0/opt/zephyr-sdk/cmake/zephyr/llvm/clang_compiler_rt.cfg

I was able to fix it with this change, but not sure if this is the preferred way of doing it.

[tejlmand]

this is interesting.

Would be nice with some more info on this, because TOOLCHAIN_C_FLAGS / TOOLCHAIN_LD_FLAGS are lists, and therefore each item should have a space between them when expanded.

The fact that this doesn't happen makes me worried because the fix in this PR won't help in a case like:

list(APPEND TOOLCHAIN_C_FLAGS --foo-flag)
list(APPEND TOOLCHAIN_C_FLAGS --bar-flag)

So if each item in the list is not expanded to individual flags then others issues may happen as well.

[DatGizmo]

After some debugging with @tejlmand we noticed the issue happens in a different place.
Closing this PR