How to build llvm-symbolizer tools for android

[Wu Chen]

Hi，Android-llvm team：

According to https://source.android.com/devices/tech/debug/asan in the Symbolization “Ensure that the llvm-symbolizer binary is present in /system/bin. llvm-symbolizer is built from sources in third_party/llvm/tools/llvm-symbolizer.”

when I buid aosp source，I can‘t find llvm-symbolizer in /system/bin.so I try to cross build llvm-symbolizer and push into /system/bin.When I run the debugger. It has the following error reports

READ of size 4294967295 at 0x00585cf83100 thread T0

==14424==WARNING: Can't read from symbolizer at fd 3

==14424==WARNING: external symbolizer didn't start up correctly!

I really need your help, which will help me analyze the security problems and help me locate the abnormal code line number in the program.Is there a general way to compile llvm tools on Android 

platform

Thanks for your kind attention and look forward your prompt reply.

Wu Chen

[Nick Desaulniers]

Can you run llvm-symbolizer via `adb shell /system/bin/llvm-symbolizer
--help`? Might not have been cross compiled correctly, not executable,
etc..

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Thanks,
~Nick Desaulniers

[Pirama Arumuga Nainar]

https://github.com/android/ndk/issues/753 tracks packaging llvm-symbolizer for the device but I don't think it's tracked for a particular NDK release.

If you're using the Android NDK, ndk-stack should also be able to symbolize asan reports as mentioned in the above NDK issue.

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