When generating code with -mno-relax, GCC puts .option norelax in the generated assembly, and so doesn’t bother passing on -mno-relax to the assembler. This has the unfortunate effect that, when using GCC to assemble hand-written assembly, -mno-relax does nothing, and we have to pass -Wa,-mno-relax to manually forward it to the assembler. This is an old GCC bug that was fixed [1] recently. For the time being, let's pass "-Wa,-mno-relax" to ASFLAGS for the GCC + LLD combination to work, e.g.: $ make CC=riscv64-unknown-elf-gcc LLVM=1 PLATFORM=generic [1] https://github.com/gcc-mirror/gcc/commit/3b0a7d624e64eeb81e4d5e8c62c46d86ef521857 Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>