Hi all, This series allows ld.lld to properly and completely link the MIPS vDSO.
Patch 1 adds ld.lld support to Kconfig so that we can avoid certain ld.bfd checks. Patch 2 moves disabling of the VDSO to Kconfig. This allows us to avoid a warning with LD=ld.lld during the clean phase, when we do not have access to CONFIG_LD_IS_LLD. Patch 3 prepares for the shift from $(CC) to $(LD) and is probably a worthwhile change aside from this series because GCC 4.6 is the minimum version allowed to build the kernel. Patch 4 does the actual shift from $(CC) to $(LD) to link the VDSO. Patch 5 allows LD=ld.lld to build the VDSO fully through Kconfig. I have build tested 32r2_defconfig, 32r2el_defconfig, 64r2_defconfig, and 64r2el_defconfig with GCC and 32r2el_defconfig and malta_kvm_guest_defconfig with clang. There is a separate issue with the 64-bit configs (https://github.com/ClangBuiltLinux/linux/issues/884) and ld.lld does not support the triple OUTPUT_FORMAT linker script macro so 32r2_defconfig errors out in a manner similar to GCC without patch 3: https://github.com/llvm/llvm-project/blob/46a75436f811d0e6a2c76c669140a7e9471cd2a3/lld/ELF/ScriptParser.cpp#L430 TODO: File an LLVM bug upstream Please let me know if there are any issues! Cheers, Nathan
