From: Catalin Marinas <catalin.marinas@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Vladimir Murzin <vladimir.murzin@arm.com>, Will Deacon <will@kernel.org>
Subject: [PATCH v2 1/2] kbuild: Add support for 'as-instr' to be used in Kconfig files
Date: Wed, 15 Jan 2020 11:30:07 +0000 [thread overview]
Message-ID: <20200115113008.3334-2-catalin.marinas@arm.com> (raw)
In-Reply-To: <20200115113008.3334-1-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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next prev parent reply other threads:[~2020-01-15 11:30 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-15 11:30 [PATCH v2 0/2] arm64: Simplify gas LSE support detection Catalin Marinas
2020-01-15 11:30 ` Catalin Marinas [this message]
2020-01-15 11:30 ` [PATCH v2 2/2] arm64: Move the LSE gas support detection to Kconfig Catalin Marinas
2020-01-15 12:49 ` [PATCH v2 0/2] arm64: Simplify gas LSE support detection Vladimir Murzin
2020-01-15 12:51 ` Will Deacon
2020-01-15 12:59 ` Vladimir Murzin
2020-01-15 13:24 ` Will Deacon
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