Meson needs a configuration file that describes the cross compilation environment (e.g. meson-android.ini). You can adjust it as necessary, but something like the following should be a good starting point:
[binaries]
c = '/tmp/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android28-clang'
cpp = '/tmp/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android28-clang++'
ar = '/tmp/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android-ar'
as = '/tmp/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android-as'
ranlib = '/tmp/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android-ranlib'
ld = '/tmp/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android-ld'
strip = '/tmp/android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android-strip'
pkgconfig = 'false'
[properties]
sys_root = '/tmp/android-ndk/sysroot'
[host_machine]
system = 'android'
cpu_family = 'arm'
cpu = 'aarch64'
endian = 'little'
Now setup the build directory with meson as usual:
$
CFLAGS="-static" LDFLAGS="-static" meson --default-library static
--prefix=/tmp/android-dir -Dblob=true build --cross-file
./meson-android.ini
A bit of explanation about all the options:
• CFLAGS="-static", LDFLAGS="-static", --default-library static: this ensure that libraries and binaries are statically compiled, so you do not need to properly set LD_* environment variables in your Android environment to make it find the right libraries. Binaries have everything they need inside.
• -Dblob=true: it tells meson to compile just one binary with all the needed code for running radare2, rabin2, rasm2, etc. and creates symbolic links to those names. This avoids creating many statically compiled large binaries and just create one that provides all features. You will still have rabin2, rasm2, rax2, etc. but they are just symlinks to radare2.
