[yocto] [musl] CC option -mmusl in SDK env script but not in default do_compile task

[Antoine MANACHE]

Hi all,

I've recently noticed a mismatch between CC options

- set by the SDK environment script

- set by the do_compile task for any 'target' class recipes when the
DISTRO is configured with TCLIBC = "musl"

The SDK env script adds "-mmusl" when exporting CC while do_compile doesn't.

We can see TARGET_CC_ARCH_append_libc-musl = " -mmusl" in file
meta/classes/toolchain-scripts.bbclass, this class is inherited when
building the meta-environment-<MACHINE> recipe (dependancy of the
populate_sdk task of core images).

Can anyone explain what is the aim of this -mmusl option and if required
why this option is not set on both sides ?

I fear this could lead to some situations where applications built from the
SDK and then built with the full Yocto stack don't behave exactly the same.

Thanks

Antoine
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