Update the Android NDK script to r25b

Updating the Android NDK in accordance with new platform support policy.

Author: chriswailes

ci/android-install-ndk.sh

@@ -12,27 +12,7 @@
 set -ex
 
 curl --retry 5 -O \
-     https://dl.google.com/android/repository/android-ndk-r15b-linux-x86_64.zip
-unzip -q android-ndk-r15b-linux-x86_64.zip
-
-case "${1}" in
-  aarch64)
-    arch=arm64
-    ;;
-
-  i686)
-    arch=x86
-    ;;
-
-  *)
-    arch="${1}"
-    ;;
-esac;
-
-android-ndk-r15b/build/tools/make_standalone_toolchain.py \
-        --unified-headers \
-        --install-dir "/android/ndk-${1}" \
-        --arch "${arch}" \
-        --api 24
-
-rm -rf ./android-ndk-r15b-linux-x86_64.zip ./android-ndk-r15b
+     https://dl.google.com/android/repository/android-ndk-r25b-linux.zip
+unzip -q android-ndk-r25b-linux.zip
+mv android-ndk-r25b "/android/ndk-${1}"
+rm -rf ./android-ndk-r25b-linux.zip

ci/docker/x86_64-linux-android/Dockerfile

@@ -21,9 +21,8 @@ RUN sh /android/android-install-ndk.sh $ANDROID_ARCH
 COPY android-sysimage.sh /android/
 RUN bash /android/android-sysimage.sh x86_64 x86_64-24_r07.zip
 
-ENV PATH=$PATH:/rust/bin:/android/ndk-$ANDROID_ARCH/bin \
-    CARGO_TARGET_X86_64_LINUX_ANDROID_LINKER=x86_64-linux-android-gcc \
-    CC_x86_64_linux_android=x86_64-linux-android-gcc \
-    CXX_x86_64_linux_android=x86_64-linux-android-g++ \
-    OBJDUMP=x86_64-linux-android-objdump \
+ENV PATH=$PATH:/rust/bin:/android/ndk-$ANDROID_ARCH/toolchains/llvm/prebuilt/linux-x86_64/bin/ \
+    CARGO_TARGET_X86_64_LINUX_ANDROID_LINKER=x86_64-linux-android21-clang \
+    CC_x86_64_linux_android=x86_64-linux-android21-clang \
+    CXX_x86_64_linux_android=x86_64-linux-android21-clang++ \
     HOME=/tmp

ci/run.sh

@@ -35,8 +35,8 @@ case ${TARGET} in
         ;;
     #Unoptimized build uses fast-isel which breaks with msa
     mips-* | mipsel-*)
-	export RUSTFLAGS="${RUSTFLAGS} -C llvm-args=-fast-isel=false"
-	;;
+        export RUSTFLAGS="${RUSTFLAGS} -C llvm-args=-fast-isel=false"
+        ;;
     # Some of our test dependencies use the deprecated `gcc` crates which is
     # missing a fix from https://github.com/alexcrichton/cc-rs/pull/627. Apply
     # the workaround manually here.
@@ -49,6 +49,8 @@ case ${TARGET} in
     riscv64*)
         export TARGET_CC="riscv64-linux-gnu-gcc"
         ;;
+    *android*)
+        export LD="${TARGET}-clang"
 esac
 
 echo "RUSTFLAGS=${RUSTFLAGS}"