kernel: Use LLVM binutils by default
* GCC has been completely removed in AOSP but we keep it
for compatibility reasons with older kernels until they
are adapted to remove all the dependencies to GCC.
* Most updated 4.19+ kernels should be able to use LLVM
binutils out of the box. 4.14 is possible with a few patches
and 4.9 with even more patches.
* Make this the default and allow devices opting out by using
TARGET_KERNEL_LLVM_BINUTILS := false
Change-Id: I569cf290b41aaf2dc16ff9cc4cc6dc461f0d504e
diff --git a/config/BoardConfigKernel.mk b/config/BoardConfigKernel.mk
index 805c5d2..1de1196 100644
--- a/config/BoardConfigKernel.mk
+++ b/config/BoardConfigKernel.mk
@@ -27,6 +27,7 @@
# x86_64-linux-android- for x86
#
# TARGET_KERNEL_CLANG_COMPILE = Compile kernel with clang, defaults to true
+# TARGET_KERNEL_LLVM_BINUTILS = Use LLVM binutils, defaults to true
# TARGET_KERNEL_VERSION = Reported kernel version in top level kernel
# makefile. Can be overriden in device trees
# in the event of prebuilt kernel.
@@ -174,9 +175,9 @@
KERNEL_MAKE_FLAGS += HOSTCC=$(CLANG_PREBUILTS)/bin/clang
KERNEL_MAKE_FLAGS += HOSTCXX=$(CLANG_PREBUILTS)/bin/clang++
-# Use LLVM's substitutes for GNU binutils if compatible kernel version.
+# Use LLVM's substitutes for GNU binutils
ifneq ($(TARGET_KERNEL_CLANG_COMPILE), false)
-ifneq (,$(filter 5.4 5.10, $(TARGET_KERNEL_VERSION)))
+ifneq ($(TARGET_KERNEL_LLVM_BINUTILS), false)
KERNEL_MAKE_FLAGS += LLVM=1 LLVM_IAS=1
endif
endif