From: Greg Hackmann <ghackmann@google.com>
Date: Tue, 25 Oct 2016 20:59:59 +0000 (-0700)
Subject: ANDROID: Kbuild, LLVMLinux: allow overriding clang target triple
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b9b964626ea839d4a93a47625c74d29a67aa926e;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

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>
---

diff --git a/Makefile b/Makefile
index 0d42e9d16812..2da4fd0851cc 100644
--- a/Makefile
+++ b/Makefile
@@ -698,7 +698,8 @@ KBUILD_CFLAGS += $(stackp-flag)
 
 ifeq ($(cc-name),clang)
 ifneq ($(CROSS_COMPILE),)
-CLANG_TARGET	:= --target=$(notdir $(CROSS_COMPILE:%-=%))
+CLANG_TRIPLE	?= $(CROSS_COMPILE)
+CLANG_TARGET	:= --target=$(notdir $(CLANG_TRIPLE:%-=%))
 GCC_TOOLCHAIN	:= $(realpath $(dir $(shell which $(LD)))/..)
 endif
 ifneq ($(GCC_TOOLCHAIN),)