Subject: [PATCH v6 16/18] kconfig: Add support for 'as-option'

From: Amit Daniel Kachhap <[email-masked]>
Date: Fri, 6 Mar 2020 12:05:23 +0530

From: Vincenzo Frascino <[email-masked]>

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 <[email-masked]>
Cc: [email-masked]
Acked-by: Masahiro Yamada <[email-masked]>
Signed-off-by: Vincenzo Frascino <[email-masked]>
Signed-off-by: Amit Daniel Kachhap <[email-masked]>
---
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

_______________________________________________
linux-arm-kernel mailing list
[email-masked]
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel