On 23/01/2020 10:30, Ard Biesheuvel wrote: > On Thu, 23 Jan 2020 at 11:22, Amit Daniel Kachhap <amit.kachhap@xxxxxxx> wrote: >> >> From: Vincenzo Frascino <vincenzo.frascino@xxxxxxx> >> >> Currently kconfig does not have a feature that allows to detect if the >> used assembler supports a specific compilation option. >> >> Introduce 'as-option' to serve this purpose in the context of Kconfig: >> >> config X >> def_bool $(as-option,...) >> >> Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> >> Cc: linux-kbuild@xxxxxxxxxxxxxxx >> Acked-by: Masahiro Yamada <masahiroy@xxxxxxxxxx> >> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx> >> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@xxxxxxx> >> --- >> Changes since v3: >> *) Changed the assembler option to -c instead of earlier -E. >> *) Added Masahiro Acked-by. >> >> scripts/Kconfig.include | 4 ++++ >> 1 file changed, 4 insertions(+) >> >> diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include >> index d4adfbe..c4b4424 100644 >> --- a/scripts/Kconfig.include >> +++ b/scripts/Kconfig.include >> @@ -31,6 +31,10 @@ cc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -E -x c /dev/null -o /de >> # Return y if the linker supports <flag>, n otherwise >> ld-option = $(success,$(LD) -v $(1)) >> >> +# $(as-option,<flag>) >> +# Return y if the assembler supports <flag>, n otherwise >> +as-option = $(success, $(CC) $(CLANG_FLAGS) $(1) -c -x assembler /dev/null -o /dev/zero) > > Did you mean '-o /dev/null' here? > No /dev/zero because otherwise I get a warning that says that I am trying to compile an object into the same file. If I invert /dev/zero and /dev/null this trashes the compilation. It took me a while to get the right combination. >> + >> # check if $(CC) and $(LD) exist >> $(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found) >> $(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found) >> -- >> 2.7.4 >> -- Regards, Vincenzo
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