That, as an example, leads to cpython 3.9.13 build failing¹ when cross-compiling on AMD64 Linux with glibc for mpc8548 Linux (OpenWrt) with musl.

As already described and confirmed as a bug in#24502 (comment) :

If I'm not mistaken,PLATFORM_TRIPLET should refer to the target platform on which cpython will run. If that is the case, the musl libc vs. glibc decision should be based on$host_os rather than$build_os as the former is based on autoconf'sAC_CANONICAL_HOST macro² which refers to the target platform that might differ from the build platform in case of cross-compilation.

I'm creating this as a separate issue concerning a particular problem, but I think this also contributes to existing discussion in#87278 .

Linked PRs

• gh-95855: Refactor platform triplet detection code, add detection for MIPS soft float and musl libc #107221