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ANDROID: Kbuild, LLVMLinux: allow overriding clang target triple

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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 <[email protected]>
[astrachan: Added a script to check for incorrectly falling back to the
            default when CLANG_TRIPLE is unset]
Bug: 118439987
Bug: 120440614
Test: make CLANG_TRIPLE=x86_64-linux-gnu CC=clang
Signed-off-by: Alistair Strachan <[email protected]>
This commit is contained in:
Greg Hackmann 2016-10-25 13:59:59 -07:00 • committed by Todd Kjos
commit e145f7b103
2 changed files with 9 additions and 1 deletions
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4
scripts/clang-android.sh Executable file
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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
$* -dM -E - </dev/null 2>&1 | grep -q __ANDROID__ && echo "y"