如何编写 CMakeLists.txt 以使用 FreeImage 预编译库和头文件

How to write a CMakeLists.txt to use FreeImage precompiled library and header file

本文关键字:编译 文件 FreeImage CMakeLists 何编写 txt      更新时间:2023-10-16

文件夹结构:

Project/
├── main.cpp
└── deps/
    └── FreeImage/
        ├── FreeImage.lib
        ├── FreeImage.dll
        ├── FreeImage.h
        ├── FreeImagePlus.lib
        ├── FreeImagePlus.dll
        └── FreeImagePlus.h

代码:

#include <FreeImagePlus.h>
int main(void)
{
    fipImage i;
    return 0;
}

现在的问题:

如何编写CMakeLists.txt文件以便能够在Windows中编译上述内容?

我的尝试作为下面的答案

您应该在此处使用不同的步骤。一个正确的目标是在FindFreeImage.cmake文件中拥有使用 FreeImage 所需的一切。然后你可以像这样设置FreeImage.cmake

FIND_PATH(FreeImage_INCLUDE_DIR FreeImage.h HINTS ${FreeImage_ROOT})
FIND_LIBRARY(FreeImage_LIBRARY NAMES FreeImage HINTS ${FreeImage_ROOT})
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(FreeImage DEFAULT_MSG FreeImage_INCLUDE_DIR FreeImage_LIBRARY)

当然,您应该添加更多内容,以便在链接到FreeImage时,您可以获得包含路径集,安装过程...但那是另一个问题。

CMakeList的一个解决方案.txt带有额外的提示

cmake_minimum_required(VERSION 3.8)
set(NAME cmakecopytest)
project(${NAME})
# The place to put built libraries
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_DEBUG "${CMAKE_BINARY_DIR}/bin/windows-64/debug")
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_DEBUG "${CMAKE_BINARY_DIR}/bin/windows-64/debug")
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG "${CMAKE_BINARY_DIR}/bin/windows-64/debug")
# Copying pre-compiled dll libraries next to the built libraries for them to be found in runtime without extra effort
configure_file("${CMAKE_CURRENT_SOURCE_DIR}/deps/FreeImage/FreeImagePlus.dll" "${CMAKE_BINARY_DIR}/bin/windows-64/debug/FreeImagePlus.dll" COPYONLY)    
configure_file("${CMAKE_CURRENT_SOURCE_DIR}/deps/FreeImage/FreeImage.dll" "${CMAKE_BINARY_DIR}/bin/windows-64/debug/FreeImage.dll" COPYONLY)
add_executable(${NAME}_exe main.cpp)
target_include_directories(${NAME}_exe PUBLIC ./ include/ deps/FreeImage)
target_link_libraries(${NAME}_exe PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/deps/FreeImage/FreeImage.lib" PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/deps/FreeImage/FreeImagePlus.lib")
# target_link_libraries(${NAME}_exe PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/deps/FreeImage/FreeImage" PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/deps/FreeImage/FreeImagePlus") # ERROR LNK1104: cannot open file '..depsFreeImageFreeImage.obj'

额外提示:

  • CMAKE_BINARY_DIR包含生成解决方案的位置(即 D:/工作/项目/生成(
  • 设置输出目录,然后将预编译库复制到同一位置是一种简单的方法,无需在 MSVS 中添加任何额外的配置即可运行代码

    math(EXPR platform_bits "${CMAKE_SIZEOF_VOID_P} * 8")
    set(platform_dir bin/${CMAKE_SYSTEM_NAME}-${platform_bits})
    foreach(config DEBUG RELEASE RELWITHDEBINFO MINSIZEREL)
        foreach(var
                CMAKE_ARCHIVE_OUTPUT_DIRECTORY_${config}
                CMAKE_LIBRARY_OUTPUT_DIRECTORY_${config}
                CMAKE_RUNTIME_OUTPUT_DIRECTORY_${config}
                )
            set(${var} "${CMAKE_BINARY_DIR}/${platform_dir}/${config}")
            string(TOLOWER "${${var}}" ${var})
            configure_file(${CMAKE_CURRENT_SOURCE_DIR}/deps/FreeImage/FreeImagePlus.dll ${var}/FreeImagePlus.dll COPYONLY)
            configure_file(${CMAKE_CURRENT_SOURCE_DIR}/deps/FreeImage/FreeImage.dll ${var}/FreeImage.dll COPYONLY)            
        endforeach()
    endforeach()
    
  • 对于所有所需的配置,这 for cycle 为您做到这一点

但是,我不喜欢在target_link_libraries(...FreeImage.lib...)中指定".lib"

其他人有一个解决方案,可以在避免链接错误的同时说target_link_libraries(${NAME}_exe PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/deps/FreeImage/FreeImage" PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/deps/FreeImage/FreeImagePlus") LNK1104: cannot open file '..depsFreeImageFreeImage.obj'