Changed RPI build test to general ARM build test (grpc#25580)

* Change rpi build test to arm test
* Having a separate docker and targetting aarch64

BUILDING.md

@@ -243,7 +243,7 @@ $ cmake ../.. -DCMAKE_TOOLCHAIN_FILE=path/to/file
 $ make
 ```
 
-[Cross-compile example](test/distrib/cpp/run_distrib_test_raspberry_pi.sh)
+[Cross-compile example](test/distrib/cpp/run_distrib_test_cmake_aarch64_cross.sh)
 
 ## Building with make on UNIX systems (deprecated)
 

test/distrib/cpp/run_distrib_test_raspberry_pi.sh → test/distrib/cpp/run_distrib_test_cmake_aarch64_cross.sh

@@ -40,51 +40,52 @@ cmake \
 make -j4 install
 popd
 
-# Download raspberry pi toolchain.
-mkdir -p "/tmp/raspberrypi_root"
-pushd "/tmp/raspberrypi_root"
-git clone https://github.com/raspberrypi/tools raspberrypi-tools
-cd raspberrypi-tools && git checkout 4a335520900ce55e251ac4f420f52bf0b2ab6b1f && cd ..
-
 # Write a toolchain file to use for cross-compiling.
-cat > toolchain.cmake <<'EOT'
+cat > /tmp/toolchain.cmake <<'EOT'
 SET(CMAKE_SYSTEM_NAME Linux)
-SET(CMAKE_SYSTEM_PROCESSOR arm)
-set(devel_root /tmp/raspberrypi_root)
-set(CMAKE_STAGING_PREFIX ${devel_root}/stage)
-set(tool_root ${devel_root}/raspberrypi-tools/arm-bcm2708)
-set(CMAKE_SYSROOT ${tool_root}/arm-rpi-4.9.3-linux-gnueabihf/arm-linux-gnueabihf/sysroot)
-set(CMAKE_C_COMPILER ${tool_root}/arm-linux-gnueabihf/bin/arm-linux-gnueabihf-gcc)
-set(CMAKE_CXX_COMPILER ${tool_root}/arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++)
+SET(CMAKE_SYSTEM_PROCESSOR aarch64)
+set(CMAKE_STAGING_PREFIX /tmp/stage)
+set(CMAKE_C_COMPILER /usr/bin/aarch64-linux-gnu-gcc-6)
+set(CMAKE_CXX_COMPILER /usr/bin/aarch64-linux-gnu-g++-6)
 set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
 set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
 set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
 set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
 EOT
+
+# Build and install absl (absl won't be installed down below)
+mkdir -p "third_party/abseil-cpp/cmake/build_arm"
+pushd "third_party/abseil-cpp/cmake/build_arm"
+cmake -DCMAKE_TOOLCHAIN_FILE=/tmp/toolchain.cmake \
+      -DCMAKE_BUILD_TYPE=Release \
+      -DCMAKE_INSTALL_PREFIX=/tmp/install \
+      -DCMAKE_POSITION_INDEPENDENT_CODE=TRUE \
+      ../..
+make -j4 install
 popd
 
-# Build and install gRPC for raspberry pi.
+# Build and install gRPC for ARM.
 # This build will use the host architecture copies of protoc and
 # grpc_cpp_plugin that we built earlier because we installed them
 # to a location in our PATH (/usr/local/bin).
-mkdir -p "cmake/raspberrypi_build"
-pushd "cmake/raspberrypi_build"
-cmake -DCMAKE_TOOLCHAIN_FILE=/tmp/raspberrypi_root/toolchain.cmake \
+mkdir -p "cmake/build_arm"
+pushd "cmake/build_arm"
+cmake -DCMAKE_TOOLCHAIN_FILE=/tmp/toolchain.cmake \
       -DCMAKE_BUILD_TYPE=Release \
-      -DCMAKE_INSTALL_PREFIX=/tmp/raspberrypi_root/grpc_install \
+      -DCMAKE_INSTALL_PREFIX=/tmp/install \
       ../..
 make -j4 install
 popd
 
-# Build helloworld example for raspberry pi.
+# Build helloworld example for ARM.
 # As above, it will find and use protoc and grpc_cpp_plugin
 # for the host architecture.
-mkdir -p "examples/cpp/helloworld/cmake/raspberrypi_build"
-pushd "examples/cpp/helloworld/cmake/raspberrypi_build"
-cmake -DCMAKE_TOOLCHAIN_FILE=/tmp/raspberrypi_root/toolchain.cmake \
+mkdir -p "examples/cpp/helloworld/cmake/build_arm"
+pushd "examples/cpp/helloworld/cmake/build_arm"
+cmake -DCMAKE_TOOLCHAIN_FILE=/tmp/toolchain.cmake \
       -DCMAKE_BUILD_TYPE=Release \
-      -DProtobuf_DIR=/tmp/raspberrypi_root/stage/lib/cmake/protobuf \
-      -DgRPC_DIR=/tmp/raspberrypi_root/stage/lib/cmake/grpc \
+      -DProtobuf_DIR=/tmp/stage/lib/cmake/protobuf \
+      -DgRPC_DIR=/tmp/stage/lib/cmake/grpc \
       ../..
 make
 popd

tools/dockerfile/distribtest/cpp_stretch_aarch64_cross_x64/Dockerfile

@@ -0,0 +1,29 @@
+# Copyright 2021 The gRPC Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+FROM debian:stretch
+
+# gRPC C++ dependencies based on https://github.com/grpc/grpc/blob/master/BUILDING.md
+RUN apt-get update && apt-get install -y build-essential autoconf libtool pkg-config && apt-get clean
+
+# debian stretch has cmake 3.7: https://packages.debian.org/stretch/cmake
+RUN apt-get update && apt-get install -y cmake && apt-get clean
+
+# C++ distribtests are setup in a way that requires git
+RUN apt-get update && apt-get install -y git && apt-get clean
+
+# aarch cross-compiler
+RUN apt-get update && apt-get install -y g++-6-aarch64-linux-gnu
+
+CMD ["bash"]

tools/run_tests/artifacts/distribtest_targets.py

@@ -326,7 +326,8 @@ def targets():
         CppDistribTest('linux', 'x64', 'stretch',
                        'cmake_module_install_pkgconfig'),
         CppDistribTest('linux', 'x64', 'stretch', 'cmake_pkgconfig'),
-        CppDistribTest('linux', 'x64', 'stretch', 'raspberry_pi'),
+        CppDistribTest('linux', 'x64', 'stretch_aarch64_cross',
+                       'cmake_aarch64_cross'),
         CppDistribTest('windows', 'x86', testcase='cmake'),
         CppDistribTest('windows', 'x86', testcase='cmake_as_externalproject'),
         # C#