diff options
| author | Greg Hackmann <ghackmann@google.com> | 2016-10-25 13:59:59 -0700 |
|---|---|---|
| committer | Alistair Strachan <astrachan@google.com> | 2018-11-29 13:22:03 -0800 |
| commit | c04915fd693950067cc9dfc6f4046b80d80107e1 (patch) | |
| tree | 1c7f8a6f6121fe3b9b1faa729737833f7e138d96 | |
| parent | e3d1cdc82d3f2cc248e4a49d43b526731a01054f (diff) | |
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>
[astrachan: Added a script to check for incorrectly falling back to the
default when CLANG_TRIPLE is unset]
Bug: 118442619
Signed-off-by: Alistair Strachan <astrachan@google.com>
| -rw-r--r-- | Makefile | 6 | ||||
| -rwxr-xr-x | scripts/clang-android.sh | 4 |
2 files changed, 9 insertions, 1 deletions
@@ -611,7 +611,11 @@ all: vmlinux ifeq ($(cc-name),clang) ifneq ($(CROSS_COMPILE),) -CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%)) +CLANG_TRIPLE ?= $(CROSS_COMPILE) +CLANG_TARGET := --target=$(notdir $(CLANG_TRIPLE:%-=%)) +ifeq ($(shell $(srctree)/scripts/clang-android.sh $(CC) $(CLANG_TARGET)), y) +$(error "Clang with Android --target detected. Did you specify CLANG_TRIPLE?") +endif GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD))) CLANG_PREFIX := --prefix=$(GCC_TOOLCHAIN_DIR) GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) diff --git a/scripts/clang-android.sh b/scripts/clang-android.sh new file mode 100755 index 000000000000..9186c4f48576 --- /dev/null +++ b/scripts/clang-android.sh @@ -0,0 +1,4 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 + +$* -dM -E - </dev/null 2>&1 | grep -q __ANDROID__ && echo "y" |