cmake:当我导入预建库时，缺少并且没有已知的规则来制作它

Question

我想使用这个 CmakeLists.txt 片段导入一个预构建的库:

add_library(openssl-crypto
            SHARED
            IMPORTED )
set_target_properties(openssl-crypto
                      PROPERTIES
                      IMPORTED_LOCATION
                      ${external_DIR}/libs/${ANDROID_ABI}/libcrypto.so )
include_directories(${external_DIR}/include/openssl)

我将其链接到我的图书馆:
target_link_libraries(aes-crypto openssl-crypto)
尝试构建会返回此错误:

'/libs/arm64-v8a/libcrypto.so', needed by ...,  missing and no known rule to make it

Answer 1

我发现set_target_properties函数不喜欢相对路径。

来自 CMake Documentation on IMPORTED_LOCATION

Full path to the main file on disk for an IMPORTED target.

为了解决这个问题，我使用了库的完整路径。

例子:

set_target_properties ( curl-lib 
                        PROPERTIES IMPORTED_LOCATION 
                        libs/${ANDROID_ABI}/libcurl.a )

. . . becomes . . . 

set_target_properties ( curl-lib 
                        PROPERTIES IMPORTED_LOCATION 
                        ${PROJECT_SOURCE_DIR}/src/main/cpp/libs/${ANDROID_ABI}/libcurl.a )