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From: Amit Daniel Kachhap <amit.kachhap@arm.com>
Subject: [PATCH v3 14/16] kconfig: Add support for 'as-option'
Date: Mon, 16 Dec 2019 14:17:16 +0530
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Cc: Mark Rutland <mark.rutland@arm.com>, Kees Cook <keescook@chromium.org>, Ard Biesheuvel <ard.biesheuvel@linaro.org>, Catalin Marinas <catalin.marinas@arm.com>, Suzuki K Poulose <suzuki.poulose@arm.com>, Will Deacon <will@kernel.org>, Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>, Kristina Martsenko <kristina.martsenko@arm.com>, Dave Martin <Dave.Martin@arm.com>, Amit Daniel Kachhap <amit.kachhap@arm.com>, James Morse <james.morse@arm.com>, Vincenzo Frascino <Vincenzo.Frascino@arm.com>, Mark Brown <Mark.Brown@arm.com>, Richard Henderson <richard.henderson@linaro.org>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Masahiro Yamada <yamada.masahiro@socionext.com>, linux-kbuild@vger.kernel.org

From: Vincenzo Frascino <vincenzo.frascino@arm.com>

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@socionext.com>
Cc: linux-kbuild@vger.kernel.org
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
---
Changes since last version:
* None.

 scripts/Kconfig.include | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
index d4adfbe..cc465dd 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) -E -x assembler /dev/null -o /dev/null)
+
 # 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