On Mon, Mar 18, 2019 at 8:51 PM Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote: > > On Mon, Mar 18, 2019 at 10:46 AM Masahiro Yamada > <yamada.masahiro@xxxxxxxxxxxxx> wrote: > [ ... ] > > > ifeq ($(CONFIG_X86_64),y) > > > KBUILD_LDFLAGS += $(call ld-option, -z noreloc-overflow) > > > > > > Is this equivalent to > > $(LD) --help 2>&1 | grep -q "\-z noreloc-overflow" ... ? > > I tried with BFD (option exists and is set) and LLD (option does not > exist, is not set). > > You do not think it is equivalent? How about BFD (option does not exist) ? cc-option, ld-option, and friends check whether the exit code is zero or not. ld shows a warning for unsupported "-v ...", but returns 0 somehow. But, it correctly returns 1 for the other unsupported options. I do not know why. $ ld -v GNU ld (GNU Binutils for Ubuntu) 2.26.1 $ ld --help 2>&1 | grep -q "\-z noreloc-overflow" $ echo $? 1 $ ld -z noreloc-overflow -v ld: warning: -z noreloc-overflow ignored. GNU ld (GNU Binutils for Ubuntu) 2.26.1 $ echo $? 0 $ ld -mmy-machine -v ld: unrecognised emulation mode: my-machine Supported emulations: elf_x86_64 elf32_x86_64 elf_i386 elf_iamcu i386linux elf_l1om elf_k1om i386pep i386pe $ echo $? 1 -- Best Regards Masahiro Yamada
