On Fri, May 27, 2022 at 07:01:49PM +0900, Masahiro Yamada wrote: > New build flow > ============== > > [1] single-object module > > Since there is only one object, there is no need to keep the LLVM IR. > Use $(CC)+$(LD) to generate an ELF object in one build rule. When LTO > is disabled, $(LD) is unneeded because $(CC) produces an ELF object. > > $(CC)+$(LD)+objtool $(LD) > foo.c ----------------------------> foo.o ---------> foo.ko > (ELF) | > | > foo.mod.o --/ > > [2] multi-object module > > Previously, $(AR) was used to combine LLVM bitcode into an archive, > but there was no technical reason to do so. Use $(LD) to merge them > into a single ELF object. > > $(LD) > $(CC) +objtool $(LD) > foo1.c ---------> foo1.o ---------> foo.o ---------> foo.ko > | (ELF) | > foo2.c ---------> foo2.o ----/ | > (LLVM IR) foo.mod.o --/ > > Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx> > Reviewed-by: Nicolas Schier <nicolas@xxxxxxxxx> > Tested-by: Nathan Chancellor <nathan@xxxxxxxxxx> > Reviewed-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx> > Tested-by: Sedat Dilek <sedat.dilek@xxxxxxxxx> # LLVM-14 (x86-64) Acked-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> -- Josh
