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From: Catalin Marinas <catalin.marinas@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Will Deacon <will@kernel.org>
Subject: [PATCH 1/2] kbuild: Add support for 'as-instr' to be used in Kconfig files
Date: Thu,  9 Jan 2020 17:49:47 +0000	[thread overview]
Message-ID: <20200109174948.48211-2-catalin.marinas@arm.com> (raw)
In-Reply-To: <20200109174948.48211-1-catalin.marinas@arm.com>

Similar to 'cc-option' or 'ld-option', it is occasionally necessary to
check whether the assembler supports certain ISA extensions. In the
arm64 code we currently do this in Makefile with an additional define:

lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)

Add the 'as-instr' option so that it can be used in Kconfig directly:

	def_bool $(as-instr,.arch_extension lse)

Acked-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
 scripts/Kconfig.include | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
index d4adfbe42690..9d07e59cbdf7 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-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 -)
+
 # 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)

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  reply	other threads:[~2020-01-09 17:50 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-09 17:49 [PATCH 0/2] arm64: Simplify gas LSE support detection Catalin Marinas
2020-01-09 17:49 ` Catalin Marinas [this message]
2020-01-09 17:49 ` [PATCH 2/2] arm64: Move the LSE gas support detection to Kconfig Catalin Marinas
2020-01-10 11:54   ` Vladimir Murzin
2020-01-10 12:08     ` Will Deacon
2020-01-10 15:30       ` Catalin Marinas
2020-01-10 15:45         ` Will Deacon
2020-01-13 11:36           ` Catalin Marinas
2020-01-14 17:19             ` Will Deacon

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