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BACKPORT: Makefile: move initial clang flag handling into scripts/Makefile.clang

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With some of the changes we'd like to make to CROSS_COMPILE, the initial
block of clang flag handling which controls things like the target triple,
whether or not to use the integrated assembler and how to find GAS,
and erroring on unknown warnings is becoming unwieldy. Move it into its
own file under scripts/.

Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Bug: 209655537
[nd: conflict in MAINTAINERS]
(cherry picked from commit 6f5b41a2f5a6314614e286274eb8e985248aac60)
Change-Id: I350ba8aaf924f7b373d25ef67260e6373a405d12
This commit is contained in:
Nick Desaulniers 2021-08-02 11:39:08 -07:00 committed by Michael Bestas
parent a419239633
commit 26a02d4186
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GPG Key ID: CC95044519BE6669
3 changed files with 17 additions and 14 deletions
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2
MAINTAINERS
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@ -4294,6 +4294,8 @@ W: https://clangbuiltlinux.github.io/
B: https://github.com/ClangBuiltLinux/linux/issues
C: irc://chat.freenode.net/clangbuiltlinux
F: Documentation/kbuild/llvm.rst
F: include/linux/compiler-clang.h
F: scripts/Makefile.clang
F: scripts/clang-tools/
K: \b(?i:clang|llvm)\b

15
Makefile
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@ -599,20 +599,7 @@ endif
CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
ifneq ($(CROSS_COMPILE),)
CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
endif
ifeq ($(LLVM_IAS),1)
CLANG_FLAGS += -fintegrated-as
else
CLANG_FLAGS += -fno-integrated-as
GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
endif
CLANG_FLAGS += -Werror=unknown-warning-option
KBUILD_CFLAGS += $(CLANG_FLAGS)
KBUILD_AFLAGS += $(CLANG_FLAGS)
export CLANG_FLAGS
include $(srctree)/scripts/Makefile.clang
endif
# Include this also for config targets because some architectures need

14
scripts/Makefile.clang Normal file
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@ -0,0 +1,14 @@
ifneq ($(CROSS_COMPILE),)
CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
endif
ifeq ($(LLVM_IAS),1)
CLANG_FLAGS += -fintegrated-as
else
CLANG_FLAGS += -fno-integrated-as
GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
endif
CLANG_FLAGS += -Werror=unknown-warning-option
KBUILD_CFLAGS += $(CLANG_FLAGS)
KBUILD_AFLAGS += $(CLANG_FLAGS)
export CLANG_FLAGS