cmake:当我导入预建库时，缺少并且没有已知的规则来制作它

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问题描述

我想使用这个 CmakeLists.txt 片段导入一个预构建的库:

I want to import a prebuilt library using this CmakeLists.txt snippet:

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)

我将此链接到我的图书馆:

I linked this to my library as:

target_link_libraries(aes-crypto openssl-crypto)

尝试构建会返回此错误:

Attempting to build returns this error:

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

推荐答案

我发现 IMPORTED_LOCATION 属性在传递给 set_target_properties 函数时不喜欢相对路径.

I found that the IMPORTED_LOCATION property, when passed to the set_target_properties function doesn't like relative paths.

来自 IMPORTED_LOCATION 上的 CMake 文档

导入目标的磁盘上主文件的完整路径.

为了解决这个问题，我使用了库的完整路径.

To resolve this issue, I used the full path to the library instead.

示例:

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 )

图书馆的路径可能与上面的略有不同，但 ${PROJECT_SOURCE_DIR} 通常是一个很好的起点，因为它被定义为:

The path to the library may differ slightly for you from the one above, but ${PROJECT_SOURCE_DIR} is normally a good starting point as it is defined as:

...在当前目录范围或其父目录之一中对 project() 命令的最后一次调用的源目录.请注意，它不受在子目录范围内(即从当前范围对 add_subdirectory() 的调用)调用 project() 的影响.

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