CMake find_package无法找到fCWT的config.cmake配置文件求助

问题背景 #

已按fCWT官方说明完成安装，Ubuntu系统下/usr/local/share/fcwt/cmake路径存在fCWT-config.cmake和fCWT-config-release.cmake配置文件，但在QT Creator中通过CMakeLists.txt执行find_package(fCWT REQUIRED)时，CMake报错找不到对应配置文件。

当前CMakeLists.txt内容 #

cmake_minimum_required(VERSION 3.22)

project(fft LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(GSL REQUIRED)
find_package(fCWT REQUIRED)

include_directories(${GSL_INCLUDE_DIR})
include_directories(${fCWT_INCLUDE_DIR})
include_directories(/lib/include)
include_directories(/usr/local/include)

add_executable(fft main.cpp)
target_link_libraries(fft PRIVATE ${GSL_LIBRARY})
target_link_libraries(fft PRIVATE ${fCWT_LIBRARY})

尝试过的无效配置 #

set (CMAKE_MODULE_PATH fCWT-config.cmake REQUIRED)
set (CMAKE_PREFIX_PATH /usr/local/share/fcwt/cmake/fCWT-config.cmake REQUIRED)
set (fCWT-config.cmake_DIR = /usr/local/share/fcwt/cmake/ REQUIRED)
list(APPEND CMAKE_SYSTEM_PREFIX_PATH /usr/local/share/fcwt/cmake)

CMake报错信息 #

CMakeLists.txt:14: error: By not providing "FindfCWT.cmake" in CMAKE_MODULE_PATH this project has asked CMake to find a package configuration file provided by "fCWT", but CMake did not find one. Could not find a package configuration file provided by "fCWT" with any of the following names:

fCWTConfig.cmake
fcwt-config.cmake

Add the installation prefix of "fCWT" to CMAKE_PREFIX_PATH or set "fCWT_DIR" to a directory containing one of the above files. If "fCWT" provides a separate development package or SDK, be sure it has been installed.

解决建议 #

1. 正确指定fCWT配置文件目录 #

在find_package(fCWT REQUIRED)前添加以下配置，直接指向配置文件所在目录：

set(fCWT_DIR "/usr/local/share/fcwt/cmake" CACHE PATH "Path to fCWT configuration files")

或者在QT Creator的CMake配置界面（Projects > Build Settings > CMake > CMake options）添加参数：

-DfCWT_DIR=/usr/local/share/fcwt/cmake

2. 强制使用CONFIG模式查找 #

CMake默认优先查找Find<Package>.cmake模块，改为明确使用配置文件模式查找：

find_package(fCWT REQUIRED CONFIG)

3. 匹配CMake期望的配置文件名 #

报错显示CMake期望的文件名是fCWTConfig.cmake或fcwt-config.cmake，而当前文件是fCWT-config.cmake，可通过创建软链接解决：

sudo ln -s /usr/local/share/fcwt/cmake/fCWT-config.cmake /usr/local/share/fcwt/cmake/fcwt-config.cmake

4. 改用现代CMake写法优化链接 #

避免手动设置包含目录和库路径，直接使用fCWT导出的目标（配置文件通常会生成fCWT::fCWT目标）：

# 替换原include_directories和target_link_libraries相关代码
target_link_libraries(fft PRIVATE GSL::GSL fCWT::fCWT)

内容的提问来源于stack exchange，提问作者Walrus