Created attachment 163648 [details] commands to reproduce the issue When building u-boot for ARM with clang from the base system with an external as, march is not passed on, resulting in several build errors. Explicitly adding e.g. -Xassembler -march=armv7-a can be used to workaround it. Example attached.
^Triage: I'm sorry that this PR did not get addressed in a timely fashion. By now, the version that it was created against is long out of support. Please re-open if it is still a problem on a supported version.