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 v5:
* More descriptions for using /dev/zero.
scripts/Kconfig.include | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
index 85334dc..a1c1925 100644
--- a/scripts/Kconfig.include
+++ b/scripts/Kconfig.include
@@ -31,6 +31,12 @@ cc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -S -x c /dev/null -o /de
# Return y if the linker supports <flag>, n otherwise
ld-option = $(success,$(LD) -v $(1))
+# $(as-option,<flag>)
+# /dev/zero is used as output instead of /dev/null as some assembler cribs when
+# both input and output are same. Also both of them have same write behaviour so
+# can be easily substituted.
+as-option = $(success, $(CC) $(CLANG_FLAGS) $(1) -c -x assembler /dev/null -o /dev/zero)
+
# $(as-instr,<instr>)
# Return y if the assembler supports <instr>, n otherwise
as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler -o /dev/null -)
--
2.7.4
