Windows下CMake构建ympd时LibMPDClient未找到的参数配置求助

Hey there, I’ve been in your exact spot before—frustrated that CMake can’t find a dependency you’ve already spent time compiling. Let’s walk through a few straightforward ways to point CMake straight to your libmpdclient files and get that ympd build rolling.

Option 1: Specify Paths Directly in the CMake Command Line #

This is the quickest fix. When running cmake .. from your ympd build directory, add two command-line arguments to explicitly tell CMake where to find the library and its headers:

cmake .. -DLIBMPDCLIENT_LIBRARY="C:/your/path/to/mpd/ympd/libmpdclient-2.13/libmpdclient-2.lib" -DLIBMPDCLIENT_INCLUDE_DIR="C:/your/path/to/mpd/ympd/libmpdclient-2.13/include"

Quick Notes: #

• Swap out the example paths with your actual file locations. On Windows, use forward slashes (/) or double backslashes (\\) to avoid CMake parsing errors.
• Critical: CMake needs a linker input file (like a .lib import library) for linking, not the .dll directly. Check your libmpdclient-2.13 folder (especially the .output subdirectory) for a .lib file—use that path for LIBMPDCLIENT_LIBRARY if it exists. The .dll will only be needed when running ympd later.

Option 2: Edit the CMakeCache.txt File #

If you’ve already run cmake .. once, your build directory will have a CMakeCache.txt file. You can manually update the missing paths here:

1. Open CMakeCache.txt in a text editor.
2. Search for lines starting with LIBMPDCLIENT_LIBRARY: and LIBMPDCLIENT_INCLUDE_DIR:.
3. Replace their empty or incorrect values with your actual paths, like this:

   LIBMPDCLIENT_LIBRARY:FILEPATH=C:/your/path/to/libmpdclient-2.13/libmpdclient-2.lib
   LIBMPDCLIENT_INCLUDE_DIR:PATH=C:/your/path/to/libmpdclient-2.13/include
   

4. Save the file and re-run cmake ..—CMake will pick up the corrected paths immediately.

Option 3: Tweak the FindLibMPDClient.cmake File #

Since you have the FindLibMPDClient.cmake in your ympd cmake directory, you can modify it to automatically search your local libmpdclient folder:

1. Open mpd/ympd/cmake/FindLibMPDClient.cmake.
2. Add this line near the top to set a root path for your local libmpdclient installation:

   set(LIBMPDCLIENT_ROOT "${CMAKE_SOURCE_DIR}/libmpdclient-2.13" CACHE PATH "Local libmpdclient directory")
   

3. Update the find_path and find_library calls to include this root as a priority search location:

   find_path(LIBMPDCLIENT_INCLUDE_DIR NAMES mpd/client.h
             HINTS ${LIBMPDCLIENT_ROOT}/include)
   
   find_library(LIBMPDCLIENT_LIBRARY NAMES libmpdclient-2 mpdclient
                HINTS ${LIBMPDCLIENT_ROOT} ${LIBMPDCLIENT_ROOT}/.output)
   

4. Save the file, then re-run cmake .. from your build directory. CMake will now check your local libmpdclient folder first before searching system paths.

Final Quick Checks #

• Make sure the include directory in your libmpdclient folder contains the mpd/client.h header. If the header is nested deeper (like in src/mpd), adjust LIBMPDCLIENT_INCLUDE_DIR to point to the parent folder of the mpd subdirectory.
• If you built libmpdclient as a static library, double-check that the .lib file matches the build type (Debug/Release) you’re using for ympd.

内容的提问来源于stack exchange，提问作者bierschi