CMake脚本忽略CMAKE_ANDROID_ARCH_ABI，始终构建armeabi

Question

我正在构建一个外部库taglib，其中包含Android的CMake ExternalLibrary选项。我已将CMAKE_ANDROID_ARCH_ABI设置为x86，但构建总是导致armeabi共享库。为什么？

这里的片段：

include(ExternalProject) 

# taglib configuration 
set(TAGLIB_VERSION 1.11.1) 
set(TAGLIB_CHECKSUM "8624219ba50c77f17889af15e1ca5f7d") 

ExternalProject_Add(
    taglib 
    URL ${CMAKE_CURRENT_SOURCE_DIR}/external/taglib-${TAGLIB_VERSION}.zip 
    URL_MD5 ${TAGLIB_CHECKSUM} 
    CONFIGURE_COMMAND ${CMAKE_COMMAND} 
         ${CMAKE_CURRENT_BINARY_DIR}/taglib/src/taglib 
         -DCMAKE_SYSTEM_NAME=Android 
         -DCMAKE_ANDROID_API=${ANDROID_NATIVE_API_LEVEL} 
         -DCMAKE_ANDROID_ARCH_ABI=${ANDROID_ABI} 
         -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE} 
         -GUnix\ Makefiles 
         -DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM} 
         -DBUILD_SHARED_LIBS=ON 
         -DCMAKE_INSTALL_PREFIX=${CMAKE_CURRENT_BINARY_DIR}/build/taglib/${ANDROID_ABI} 

    PREFIX taglib 
    INSTALL_COMMAND ${CMAKE_MAKE_PROGRAM} install 
        && 
        ${CMAKE_COMMAND} -E copy 
        ${CMAKE_CURRENT_BINARY_DIR}/build/taglib/${ANDROID_ABI}/lib/libtag.so 
        ${CMAKE_SUPERBUILD_OUT}/${ANDROID_ABI}/libtag.so 
) 

add_library(tag SHARED IMPORTED) 
set_target_properties(tag PROPERTIES IMPORTED_LOCATION ${CMAKE_CURRENT_BINARY_DIR}/build/taglib/${ANDROID_ABI}/lib/libtag.so) 
include_directories(${CMAKE_CURRENT_BINARY_DIR}/build/taglib/${ANDROID_ABI}/include) 

Answer 1

而Android NDK工具链文件不使用MAKE_ANDROID_ARCH_ABI，还必须在ExternalProject_Add调用指定ANDROID_ABI标志。然后它建立适当的拱门。