For compiling bpf code, the system include directory needs to be constructed. On Debian-like systems, this requires passing a multiarch directory. Since clang's -dump-machine prints something other that the multiarch triplet, gcc was interrogated earlier, but that also yields a wrong result for cross compilation and was thus skipped resulting in clang not finding asm/types.h. Rather than, -dump-machine we should ask for -print-multiarch (which rarely differs). Whenever gcc is in use, this is right (even for cross building). Since clang does not support -print-multiarch and its -dump-machine never matches Debian's multiarch, we resort to asking gcc when building natively. For cross builds using clang, we are out of luck.
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