cross linkers probably report bad error messages
doreloc.c includes machdep.h, which includes the right machdep.h based on the platform preprocessor symbol (__i386, say). We end up using M_MACH when reporting errors, set in the platform machdep.h
Unfortunately, this probably means that the cross-linker when it encounters a relocation of unsupported size, will mis-report the relocation by using the native name, rather than the target name, since we included machdep.h not explicitly machdep_sparc.h or whatever, so M_MACH will be the host machine not the target.
You can see this by adding, for eg
#if M_MACH == EM_386 #error "I think I'm an i386!" #endif
to the SPARC doreloc.c
The doreloc.c's should probably explicitly include their own machdep header.
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