ANDROID: Kbuild, LLVMLinux: allow overriding clang target triple
Android has an unusual setup where the kernel needs to target [arch]-linux-gnu to avoid Android userspace-specific flags and optimizations, but AOSP doesn't ship a matching binutils. Add a new variable CLANG_TRIPLE which can override the "-target" triple used to compile the kernel, while using a different CROSS_COMPILE to pick the binutils/gcc installation. For Android you'd do something like: export CLANG_TRIPLE=aarch64-linux-gnu- export CROSS_COMPILE=aarch64-linux-android- If you don't need something like this, leave CLANG_TRIPLE unset and it will default to CROSS_COMPILE. Change-Id: I85d63599c6ab8ed458071cdf9197d85b1f7f150b Signed-off-by: Greg Hackmann <ghackmann@google.com>
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Makefile
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@ -494,7 +494,8 @@ endif
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ifeq ($(cc-name),clang)
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ifneq ($(CROSS_COMPILE),)
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CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%))
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CLANG_TRIPLE ?= $(CROSS_COMPILE)
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CLANG_TARGET := --target=$(notdir $(CLANG_TRIPLE:%-=%))
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GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..)
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endif
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ifneq ($(GCC_TOOLCHAIN),)
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