Question

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;
}

现在是问题：

如何编写CMakeLists.txt文件以便能够在Windows中进行编译？

我在下面尝试回答

Answer 1

您应在此处使用不同的步骤。一个适当的目标是在FindFreeImage.cmake文件中包含使用FreeImage所需的一切。然后，您可以像这样设置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，以便在与FreeImage链接时获得包含路径集，安装过程……但这将是另一个问题。

Answer 2

一个带有额外提示的CMakeLists.txt解决方案

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 '..\deps\FreeImage\FreeImage.obj'

其他提示：

CMAKE_BINARY_DIR包含构建解决方案的位置（即D：/ Work / Project / build）

设置输出目录，然后将预编译的库复制到同一位置是运行代码的简单方法，而无需在MSVS中添加任何额外的配置

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()

这个for周期可以为您完成所有所需的配置

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

中指定“ .lib”

其他任何人都可以在避免链接错误target_link_libraries(${NAME}_exe PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/deps/FreeImage/FreeImage" PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/deps/FreeImage/FreeImagePlus")的同时说出LNK1104: cannot open file '..\deps\FreeImage\FreeImage.obj'吗？

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

2 个答案: