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Assume that a distro has configured, e.g., a gfx9-generic multilib but not for gfx902. In that case, mkoffload would fail to link with "error: incompatible mach". With this commit, an error is printed suggesting to try the associated generic architecture instead. The behavior is unchanged if there is a multilib available for the specific ISA or when there is also no multilib for the generic ICA. Note: The build of generic multilibs are currently not enabled by default; they also require the linker/assembler of LLVM 19 or newer and, in particular, for the execution a future ROCm release. (The next one? In any case, 6.3.2 does not support generic ISAs, yet.) gcc/ChangeLog: * config/gcn/mkoffload.cc (enum elf_arch_code): Add EF_AMDGPU_MACH_AMDGCN_NONE. (elf_arch): Use enum elf_arch_code as type. (tool_cleanup): Silence warning by removing tailing '.' from error. (get_arch_name): Return enum elf_arch_code. (check_for_missing_lib): New; print fatal error if the multilib is not available but it is for the associate generic ISA. (main): Call it.
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