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-Updating Platform Toolchains
-============================
-
-For the latest version of this doc, please make sure to visit:
-[Android Clang/LLVM Toolchain Prebuilts Doc](https://android.googlesource.com/platform/external/clang/+/dev/ToolchainPrebuilts.md)
-
-Picking a good upstream revision
---------------------------------
-
-We generally like to follow along with upstream LLVM's Google stable tag:
-
-http://llvm.org/svn/llvm-project/llvm/tags/google/stable/
-
-You can use git/svn to query the latest tagged version to see what we will be
-validating next.
-
-
-Updating Toolchain Source
--------------------------
-
-The following process is done in the Android LLVM tree. To fetch the sources:
-
-    repo init -u https://android.googlesource.com/platform/manifest -b llvm
-
-    # Googlers, use
-    repo init -u \
-        persistent-https://android.git.corp.google.com/platform/manifest -b llvm
-
-Loop over llvm, clang, compiler-rt (in this order):
-
-1. We are working from a separate untracked/merged branch called *aosp/dev*.
-
-        git branch -D working_dev
-        repo start working_dev .
-
-2. **OPTIONAL FIXUPS**.
-   These aren't really necessary if you remember to always keep *aosp/dev* and
-   *aosp/master* synchronized otherwise, but very often someone will forget to
-   merge back a change.
-
-   1. Grab the squashed commit that went into *aosp/master* and mark it
-      committed to *aosp/dev* too.
-
-      **Note**: If there were changes to *aosp/master* before the squashed
-      commit, grab those changes (using step 2), before applying this step,
-      and finally repeat step 2 for changes after the squashed commit.
-
-          git branch -D clean_master
-          git checkout -b clean_master <SHA_FOR_SQUASH>
-          git checkout working_dev
-          git merge -s ours clean_master
-          git push aosp refs/heads/working_dev:refs/heads/dev
-          git branch -D clean_master
-
-   2. Grab all outstanding changes that went into *aosp/master* and put them
-      into *aosp/dev* too.
-
-          git branch -D clean_master
-          git checkout -b clean_master aosp/master
-          git checkout working_dev
-          git merge clean_master
-          git push aosp refs/heads/working_dev:refs/heads/dev
-          git branch -D clean_master
-
-3. Merge the upstream branch.
-   Use `git log aosp/upsteam-master` to browse upstream commits and find a SHA.
-
-       git merge <upstream_sha>
-
-4. Fix conflicts.
-
-5. Update build rules and commit that patch on top.
-
-6. Test everything before pushing.
-
-7. Submit your work to *aosp/dev*.
-
-       git push aosp refs/heads/working_dev:refs/heads/dev
-
-8. Squash your work for *aosp/master*.
-
-       repo start update_38 .
-       git merge --squash working_dev
-       git commit -a
-       repo upload .
-
-9. Test everything before submitting the patch from the previous step.
-
-10. Grab the squashed commit and replay it in *aosp/dev*.
-
-        repo sync .
-        git remote update
-        git branch -D clean_master
-        git checkout -b clean_master aosp/master
-        git checkout working_dev
-
-    Use `-s ours` to ensure that we skip the squashed set of changes.
-    If/when we forget this, we have to do it later.
-
-        git merge -s ours clean_master
-        git push aosp refs/heads/working_dev:refs/heads/dev
-        git branch -D clean_master
-
-11. Clean up after our working branch.
-
-        git checkout --detach
-        git branch -D working_dev
-
-This works better because we can keep full history in *aosp/dev*, while
-maintaining easy reverts/commits through *aosp/master*.
-
-
-Generating New Prebuilts
-------------------------
-
-1. Run the toolchain build script. This will perform a two stage build and
-   create a tarball of the final toolchain.
-
-        python external/clang/build.py
-
-2. The just built toolchain can be tested in an existing AOSP tree by invoking
-   make with:
-
-        make \
-            LLVM_PREBUILTS_VERSION=clang-dev \
-            LLVM_PREBUILTS_BASE=/path/to/llvm/out/install
-
-   This will use the just built toolchain rather than the one in **prebuilts/**.
-   If you used something other than the default for `--build-name`, use
-   `clang-$BUILD_NAME` instead of `clang-dev`.
-
-3. Once the updates have been verified, upload to gerrit, review, submit. The
-   build server will pick up the changes and build them. The LLVM build page is
-   http://go/clang-build. Sorry, Googlers only (for now) :(
-
-4. To update the platform compiler, download the selected package from the build
-   server and extract them to the appropriate prebuilts directory. The new
-   directory will be named "clang-BUILD\_NUMBER".
-
-5. Update `LLVM\_PREBUILTS\_VERSION` in `build/core/clang/config.mk` to match
-   the new prebuilt directory. We typically keep around two versions of the
-   toolchain in prebuilts so we can easily switch between them in the build
-   system rather than needing to revert prebuilts. This also allows developers
-   that need new toolchain features to take advantage of them locally while
-   validation for the new compiler is still in progress.
-
-6. Rebuild/test everything one more time to ensure correctness.
-
-   Make sure you check *goog/master* as well as *aosp/master*.
-
-   There may be necessary fixups here, to handle .ll reading or other projects
-   where new warnings/errors are firing.
-
-        m -j48 checkbuild
-
-6. Upload the changes produced in **prebuilts/clang/host**.
-   This may entail more than a simple `git commit -a`, so look at `git status`
-   before finally uploading/committing.
-
-       repo start updated_toolchain .
-       git add clang-BUILD_NUMBER
-       git commit
-       repo upload --cbr .
-
-7. Submit CLs.
-
-
-Testing Checklist
------------------
-
-1. Do a checkbuild.
-2. Go to **external/llvm** and run `./android_test.sh` (no known failures as of
-   2015-10-08).
-3. Ensure successful build for all architectures: 32- and 64- bit ARM, x86 and
-   Mips.
-4. Run ART host tests.
-   This was broken by a rebase once, and worth testing after every rebase.
-
-       croot && cd art && mma -j40 test-art-host
-
-5. Run ART device tests.
-
-       croot && cd art && mma -j4 test-art-device
-
-
-Checklist for CLs
------------------
-
-The following projects will almost always have CLs as a part of the rebase.
-Depending on the changes in LLVM, there might be updates to other projects as
-well.
-
-* External projects
-
-  * **external/clang**
-  * **external/compiler-rt**
-  * **external/llvm**
-
-* Prebuilts
-
-  * **prebuilts/clang/host/darwin-x86/**
-  * **prebuilts/clang/host/linux-x86/**
-  * **prebuilts/clang/host/windows-x86/**