How to build Clang toolchains for Android NDK from source code

[Lixi]

we have some source changes to LLVM/Clang need add into NDK. After download and change "external/llvm" and build NDK from source. It find out that the changes never works. The code in "external/llvm" is dead code and the binary clang/clang.exe is already in NDK source code dir after repo sync which path is below. Does somebody knows how to build Clang toolchains for Android NDK from LLVM/Clang source code? Most Thanks!

The binary clang/clang.exe is already in NDK source code dir below:
https://android.googlesource.com/platform/prebuilts/clang/host/darwin-x86
https://android.googlesource.com/platform/prebuilts/clang/host/linux-x86
https://android.googlesource.com/platform/prebuilts/clang/host/windows-x86

The binary clang/clang.exe is just copy from NDK source code dir. Not build from source code.
android-ndk-r13\toolchains\llvm\prebuilt\windows-x86_64\bin\clang.exe
android-ndk-r13\toolchains\llvm\prebuilt\linux-x86_64\bin\clang

[alan]

https://android.googlesource.com/platform/ndk.git/+/master/build/tools/build-llvm.py ?

[Lixi]

Thanks for answer. I had read it before post this topic. It's just do the copy work, there is nothing more in it.

[alan]

https://android.googlesource.com/platform/ndk.git/+/master/build/tools/#II_Host-toolchains

[Lixi]

Thanks for answer again. I checked it, but find out it's saying how to build gcc toolchains from source use the build-gcc.sh. I'm sorry to say there is nothing about llvm toolchains which it's already prebuilt binaries placed in below:

https://android.googlesource.com/platform/prebuilts/clang/host/windows-x86/+/refs/heads/master/clang-3362437/bin/

https://android.googlesource.com/platform/prebuilts/clang/host/linux-x86/+/refs/heads/master/clang-3362437/bin/
And there is nothing I can find about how to build it with Google searching or in it's WIKI.

Thanks.

[Dan Albert]

It looks like I need to delete some old docs. The doc you're looking for is https://android.googlesource.com/platform/ndk/+/master/docs/Toolchains.md

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[Lixi]

Thank you very much! With this link and some test (most times one change need a total rebuild) I finally make it works!
The work also need this:
https://android.googlesource.com/platform/external/clang/+/dev/ToolchainPrebuilts.md
Thanks Again!

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