Android arm64 doesn't build on macOS host

[oviano]

The projects that genie spits out are not valid, and the compilation fails trying to find non-existent ssize_t etc.

I hacked the toolchain.lua to get it to work, by using prebuilt toolchain instead, and getting rid of all the header and library include paths that aren't needed.

If you set things up similarly to this:

		premake.gcc.cc   = "$(ANDROID_NDK_ROOT)/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android24-clang"
		premake.gcc.cxx  = "$(ANDROID_NDK_ROOT)/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android24-clang++"
		premake.gcc.ar   = "$(ANDROID_NDK_ROOT)/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android-ar"

Then the following aren't needed:

		"$(ANDROID_NDK_ROOT)/sources/cxx-stl/llvm-libc++/include",
		"${ANDROID_NDK_ROOT}/sysroot/usr/include",

		"$(ANDROID_NDK_ROOT)/sources/cxx-stl/llvm-libc++/libs/arm64-v8a",

		"$(ANDROID_NDK_ROOT)/sysroot/usr/include/aarch64-linux-android",

		"-gcc-toolchain $(ANDROID_NDK_ARM64)",
		"--sysroot=" .. path.join("$(ANDROID_NDK_ROOT)/platforms", androidPlatform, "arch-arm64"),
		"-target aarch64-none-linux-androideabi",
		"-march=armv8-a",

...and then it can be built because just specifying the appropriate CC/CXX/AR for the toolchain automatically sets up the correct include/library paths.

[sweep3r]

This works for me, using NDK r21 in ~/Library/Android/

# NDK 21 (LTS) Android setup for Mac 64bit host.
export ANDROID_NDK_ROOT=~/Library/Android/android-ndk-r21e
export ANDROID_NDK_CLANG=${ANDROID_NDK_ROOT}/toolchains/llvm/prebuilt/darwin-x86_64
export ANDROID_NDK_ARM=${ANDROID_NDK_ROOT}/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64
export ANDROID_NDK_ARM64=${ANDROID_NDK_ROOT}/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64
export ANDROID_NDK_X86=${ANDROID_NDK_ROOT}/toolchains/x86-4.9/prebuilt/darwin-x86_64
export ANDROID_NDK_X86_64=${ANDROID_NDK_ROOT}/toolchains/x86_64-4.9/prebuilt/darwin-x86_64

sudo spctl --master-disable

make android-arm64