I thought I could call $(CPP) to preprocess the assembly
file, but the aarch64-ubuntu bot runs this as clang -E and
it issues a warning and no output file, apparently,
build/bin/clang -E -o interrupt-and-trap-funcs.s /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/functionalities/unwind/frameless-faulted/interrupt-and-trap-funcs.s
clang: warning: /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/functionalities/unwind/frameless-faulted/interrupt-and-trap-funcs.s: 'assembler' input unused [-Wunused-command-line-argument]
/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang -g -O0 -c -o interrupt-and-trap-funcs.o interrupt-and-trap-funcs.s
clang: error: no such file or directory: 'interrupt-and-trap-funcs.s'
clang: error: no input files
b8ba9636f0