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Put patch files in patches/, and add patch info at the end of patches/PATCHES.json.Īn example is in aosp/1556717. We may revert upstream patches locally or add local patches.

Search “revert-checker/android” emails to find candidates, and cherry pick them.

We want to find all patches before $NEW_REVISION but reverted after $NEW_REVISION in upstream. Use cherrypick_cl.py to cherry pick upstream patches: $. The profdata is generated in go/ab/aosp-master-plus-llvm, target Clang-PGO.Īn example is in aosp/1513058. It is to speed up compile time for the new compiler.

Submit CLs in toolchain/llvm_android and toolchain/llvm-project together.Įxamples are in aosp/1515350 and aosp/1515697.

In android_version.py: _patch_level = ‘1’ _svn_revision = $NEW_REVISION # replace r407598 with the update version com / platform / manifest - b master - plus - llvm $ mkdir master - plus - llvm & cd master - plus - llvm llvm-toolchain is more suitable when trying to reproduce a toolchain from a different release. master-plus-llvm branch is a combination of llvm-toolchain and aosp-master, which can test building platform and create the build switch CL in the same tree. We can use either llvm-toolchain or master-plus-llvm branch. # Optional: Apply any LLVM/Clang modifications to toolchain/llvm-projectĬompiler Update Steps Step 1: Update source code Rebuild the toolchain with that manifest: $ mkdir llvm-toolchain & cd llvm-toolchain The build number for that toolchain is 6317467 and the manifest is found in $TOOLCHAIN_DIR/manifest_6317467.xml To rebuild a particular toolchain, find the manifest file for that release: $ $TOOLCHAIN_DIR/bin/clang -vĪndroid (6317467 based on r365631c1) clang version 9.0.8. Instructions to rebuild a particular toolchain release The solution is to remove that path from your $PATH before invoking build.py. If you have an additional llvm tree built and present in your $PATH, then build.py might fail during the Windows build of libcxxabi with the error 'libstdc++ version must be at least 4.8.'. This option only affects the second stage Clang toolchain and not the on-device targets (compiler-rt, lldb-server etc). LTO is enabled in official Android Clang/LLVM prebuilts but the flag is off by default. Pass the -lto option to build.py to build the toolchain with LTO. If building on Linux, pass -no-build windows to build.py to skip building Clang for Windows. The built toolchain will be installed to out/install/$HOST/clang-dev. Build Instructions $ mkdir llvm-toolchain & cd llvm-toolchain You can also visit the Android Clang/LLVM Prebuilts Readme Doc for more information about our prebuilt toolchains (and what versions they are based upon). For the latest version of this doc, please make sure to visit: Android Clang/LLVM Toolchain Readme Doc