Starting with Google's Android NDK r18b, gcc has been removed (history). That is, only one has to use clang as the toolchain. This may cause some problems if you do not set its toolchain as clang.
In fact, when you try to build Caffe2 for Android with android-ndk, it will fail, complaining
GCC is no longer supported. See
https://android.googlesource.com/platform/ndk/+/master/docs/ClangMigration.md.
The solution is to simply edit pytorch/scripts/build_android.sh file, replacing gcc to clang for ANDROID_TOOLCHAIN variable, as shown below:
CMAKE_ARGS+=("-DANDROID_TOOLCHAIN=gcc")
CMAKE_ARGS+=("-DANDROID_TOOLCHAIN=clang")
Happy hacking!
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