在Android上运行ECL（Embeddable Common-Lisp）

0. 准备工作

1. 获取源码：git clone https://common-lisp.net/project/ecl/
2. 准备Android SDK 及 NDK (NDK要求r17c版本，可以访问 https://developer.android.google.cn/ndk/downloads/older_releases.html 找到)
3. 安装32位的glibc

1. 构建主机 ECL

# C99 complex numbers are not fully supported on Android
./configure ABI=32 CFLAGS="-m32 -g -O2" LDFLAGS="-m32 -g -O2"\
                 --prefix=`pwd`/ecl-android-host --disable-c99complex
make -j9
make install
rm -r build
export ECL_TO_RUN=`pwd`/ecl-android-host/bin/ecl

2. 配置工具链并导出必要路径

export NDK_PATH=/opt/android-ndk
export ANDROID_API=23
export TOOLCHAIN_PATH=`pwd`/android-toolchain
${NDK_PATH}/build/tools/make_standalone_toolchain.py --arch arm --install-dir ${TOOLCHAIN_PATH} --api ${ANDROID_API}
export SYSROOT=${TOOLCHAIN_PATH}/sysroot
export PATH=${TOOLCHAIN_PATH}/bin:$PATH

3. 编译并安装必要的库

# boehm GC is not compatible with ld.gold linker, force use of ld.bfd
export LDFLAGS="--sysroot=${SYSROOT} -D__ANDROID_API__=${ANDROID_API} -fuse-ld=bfd"
export CPPFLAGS="--sysroot=${SYSROOT} -D__ANDROID_API__=${ANDROID_API} -isystem ${SYSROOT}/usr/include/arm-linux-androideabi"
export CC=arm-linux-androideabi-clang
./configure --host=arm-linux-androideabi \
                 --prefix=`pwd`/ecl-android \
                 --disable-c99complex \
                 --with-cross-config=`pwd`/src/util/android-arm.cross_config
make -j9
make install

4. 建立Android项目

1. 使用Android Studio 创建项目，包名为 org.lisp.ecl （根据实际情况更改）。
2. 添加 JNI目录和 CMakeLists.txt 文件，内容如下：

   cmake_minimum_required(VERSION 3.4.1)
   
   set(ECL_HOME /home/skyline/workspace/collection/ecl/ecl-android) #根据实际情况修改
   
   include_directories(${ECL_HOME}/include)
   link_directories(${ECL_HOME}/lib)
   
   add_library(ecl
       SHARED
       IMPORTED)
   
   set_target_properties(ecl
       PROPERTIES IMPORTED_LOCATION
       ${ECL_HOME}/lib/libecl.so)
   
   add_library(
       ecl-android
   
       SHARED
   
       src/main/jni/org_lisp_ecl_EmbeddedCommonLisp.c
       src/main/jni/ecl_boot.c)
   
   find_library(log-lib
       log)
   
   target_link_libraries(ecl-android
       ecl
       ${log-lib})
   

3. 将上一步编译出来的目录 ecl-android/lib 下的 libecl.so 复制到工程app/libs/armeabi-v7a下。
4. 将ECL项目中 examples/android 下的资源、代码添加到自己工程中。
5. app/build.gradle 添加相应配置，例如：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    defaultConfig {
        applicationId "org.lisp.ecl"
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

        externalNativeBuild {
            cmake {
                cppFlags "-std=c++11 -frtti -fexceptions"
            }
        }

        ndk {
            //设置支持的SO库架构
            abiFilters "armeabi-v7a"
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

    sourceSets {
        main {
            jni.srcDirs = ['src/main/jni', 'src/main/jni/']
            jniLibs.srcDirs = ['libs']
            assets.srcDirs = ['src/main/assets', 'src/main/assets/']
        }
    }

    externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
}