cmake install_error ai_generated true

CMake 错误：install(EXPORT) 生成了目标 "mylib"，但目标 "mylib" 的库输出路径 "/build/lib" 与安装目标 "/usr/local/lib" 不匹配

CMake Error: install(EXPORT) generated target "mylib" but target "mylib" has library output path "/build/lib" that does not match the install destination "/usr/local/lib"

ID: cmake/export-library-path-mismatch

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85%修复率
90%置信度
1证据数
2024-03-22首次发现

版本兼容性

版本状态引入弃用备注
cmake 3.26.0 active — — —
cmake 3.27.0 active — — —
cmake 3.28.0 active — — —

根因分析

目标的 LIBRARY_OUTPUT_DIRECTORY 或 ARCHIVE_OUTPUT_DIRECTORY 与 install(TARGETS) 中指定的 DESTINATION 不同，导致 CMake 在生成导出时检测到不匹配。

English

The target's LIBRARY_OUTPUT_DIRECTORY or ARCHIVE_OUTPUT_DIRECTORY differs from the DESTINATION specified in install(TARGETS), causing CMake to detect a mismatch during export generation.

generic

官方文档

https://cmake.org/cmake/help/latest/command/install.html#exporting-targets

解决方案

  1. 使用生成器表达式将目标的输出目录设置为与安装目标匹配：

set_target_properties(mylib PROPERTIES
  LIBRARY_OUTPUT_DIRECTORY "${CMAKE_INSTALL_PREFIX}/lib"
  ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_INSTALL_PREFIX}/lib"
)

然后确保 install(TARGETS mylib DESTINATION lib) 匹配。
  2. 使用与构建输出匹配的 install(DESTINATION) 相对路径：

set_target_properties(mylib PROPERTIES LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib")
install(TARGETS mylib DESTINATION "${CMAKE_BINARY_DIR}/lib")

然后使用 install(EXPORT ... DESTINATION "${CMAKE_BINARY_DIR}/lib") 生成导出。

无效尝试

常见但无效的做法:

  1. Change LIBRARY_OUTPUT_DIRECTORY to match the install destination 60% 失败

    LIBRARY_OUTPUT_DIRECTORY affects build-time output, not install; changing it may break build scripts or tests that expect the library in the original build directory.

  2. Remove install(EXPORT) entirely 90% 失败

    Removes the export mechanism, so downstream projects using find_package will fail to locate the package.