CI: Add Android automated building with GitHub Actions (#843)

Authored-By: Brad House (@bradh352)

.github/workflows/android.yml

@@ -0,0 +1,73 @@
+# Copyright (C) The c-ares project and its contributors
+# SPDX-License-Identifier: MIT
+name: Android
+on:
+  push:
+  pull_request:
+
+concurrency:
+  group: ${{ github.ref }}-android
+  cancel-in-progress: true
+
+env:
+  CMAKE_DEFAULT_FLAGS: "-DCMAKE_BUILD_TYPE=DEBUG -DCARES_STATIC=ON -DCARES_STATIC_PIC=ON -G Ninja -DANDROID_PLATFORM=android-26"
+  MAKE: make
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: "Android"
+    steps:
+      - name: Install packages
+        uses: awalsh128/cache-apt-pkgs-action@latest
+        with:
+          packages: cmake ninja-build autoconf automake libtool pkg-config
+          version: 1.0
+      - name: Checkout c-ares
+        uses: actions/checkout@v4
+      - name: Setup NDK
+        uses: nttld/setup-ndk@v1
+        id: setup-ndk
+        with:
+          ndk-version: r21e
+          add-to-path: false
+      - name: "CMake: armeabi-v7a build c-ares"
+        env:
+          BUILD_TYPE: CMAKE
+          CMAKE_FLAGS: "${{ env.CMAKE_DEFAULT_FLAGS }} -DANDROID_ABI=armeabi-v7a -DCMAKE_TOOLCHAIN_FILE=${{ steps.setup-ndk.outputs.ndk-path }}/build/cmake/android.toolchain.cmake"
+        run: |
+          ./ci/build.sh
+      - name: "CMake: arm64-v8a build c-ares"
+        env:
+          BUILD_TYPE: CMAKE
+          CMAKE_FLAGS: "${{ env.CMAKE_DEFAULT_FLAGS }} -DANDROID_ABI=arm64-v8a -DCMAKE_TOOLCHAIN_FILE=${{ steps.setup-ndk.outputs.ndk-path }}/build/cmake/android.toolchain.cmake"
+        run: |
+          ./ci/build.sh
+      - name: "CMake: x86 build c-ares"
+        env:
+          BUILD_TYPE: CMAKE
+          CMAKE_FLAGS: "${{ env.CMAKE_DEFAULT_FLAGS }} -DANDROID_ABI=x86 -DCMAKE_TOOLCHAIN_FILE=${{ steps.setup-ndk.outputs.ndk-path }}/build/cmake/android.toolchain.cmake"
+        run: |
+          ./ci/build.sh
+      - name: "CMake: x86_64 build c-ares"
+        env:
+          BUILD_TYPE: CMAKE
+          CMAKE_FLAGS: "${{ env.CMAKE_DEFAULT_FLAGS }} -DANDROID_ABI=x86_64 -DCMAKE_TOOLCHAIN_FILE=${{ steps.setup-ndk.outputs.ndk-path }}/build/cmake/android.toolchain.cmake"
+        run: |
+          ./ci/build.sh
+      - name: "Autotools: aarch64 build c-ares"
+        env:
+          BUILD_TYPE: autotools
+          TOOLCHAIN: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64"
+          TARGET: aarch64-linux-android
+          API: 26
+          AR: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ar"
+          CC: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/clang --target=aarch64-linux-android26"
+          AS: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/clang --target=aarch64-linux-android26"
+          CXX: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ --target=aarch64-linux-android26"
+          LD: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/ld"
+          RANLIB: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-ranlib"
+          STRIP: "${{ steps.setup-ndk.outputs.ndk-path }}/toolchains/llvm/prebuilt/linux-x86_64/bin/llvm-strip"
+          CONFIG_OPTS: "--host aarch64-linux-android --disable-shared"
+        run: |
+          ./ci/build.sh

configure.ac

@@ -245,8 +245,18 @@ AC_SUBST(CARES_SYMBOL_HIDING_CFLAG)
 
 
 if test "$enable_warnings" = "yes"; then
-  AX_APPEND_COMPILE_FLAGS([-std=c90 -Wall -Wextra -Waggregate-return -Wcast-align -Wcast-qual -Wconversion -Wdeclaration-after-statement -Wdouble-promotion -Wfloat-equal -Wformat-security -Winit-self -Wjump-misses-init -Wlogical-op -Wmissing-braces -Wmissing-declarations -Wmissing-format-attribute -Wmissing-include-dirs -Wmissing-prototypes -Wnested-externs -Wno-coverage-mismatch -Wold-style-definition -Wpacked -Wpedantic -Wpointer-arith -Wredundant-decls -Wshadow -Wsign-conversion -Wstrict-overflow -Wstrict-prototypes -Wtrampolines -Wundef -Wunreachable-code -Wunused -Wvariadic-macros -Wvla -Wwrite-strings -Werror=implicit-int -Werror=implicit-function-declaration -Werror=partial-availability -Wno-long-long ],
+  AX_APPEND_COMPILE_FLAGS([-Wall -Wextra -Waggregate-return -Wcast-align -Wcast-qual -Wconversion -Wdeclaration-after-statement -Wdouble-promotion -Wfloat-equal -Wformat-security -Winit-self -Wjump-misses-init -Wlogical-op -Wmissing-braces -Wmissing-declarations -Wmissing-format-attribute -Wmissing-include-dirs -Wmissing-prototypes -Wnested-externs -Wno-coverage-mismatch -Wold-style-definition -Wpacked -Wpedantic -Wpointer-arith -Wredundant-decls -Wshadow -Wsign-conversion -Wstrict-overflow -Wstrict-prototypes -Wtrampolines -Wundef -Wunreachable-code -Wunused -Wvariadic-macros -Wvla -Wwrite-strings -Werror=implicit-int -Werror=implicit-function-declaration -Werror=partial-availability -Wno-long-long ],
     [AM_CFLAGS], [-Werror])
+
+  dnl Android requires c99, all others should use c90
+  case $host_os in
+    *android*)
+      AX_APPEND_COMPILE_FLAGS([-std=c99], [AM_CFLAGS], [-Werror])
+      ;;
+    *)
+      AX_APPEND_COMPILE_FLAGS([-std=c90], [AM_CFLAGS], [-Werror])
+      ;;
+  esac
 fi
 
 if test "$ax_cv_c_compiler_vendor" = "intel"; then