CMake-使用错误的参数数量调用add_executable [英] CMake - add_executable called with incorrect number of arguments

问题描述

我正在尝试组织一个C ++项目，该项目开始包含很多文件。我想创建两个使用Cmake共享某些源文件的可执行文件。我在这里找到了一个有趣的过程：

I am trying to organize a C++ project which starts to have a lot of files. I would like to create two executables which share some source file using Cmake. I have found an interesting procedure here:

如何在另一个文件夹中添加源文件

下面是我的版本

file(GLOB Common_sources RELATIVE "Common" "*cpp")
file(GLOB Mps_sources RELATIVE "Mps" "*.cpp")                 
file(GLOB Mss_sources RELATIVE "Mss" "*.cpp") 

add_executable(test_mss ${Common_sources} ${Mss_sources}) 
add_executable(test_mps ${Common_sources} ${Mps_sources})

但是CMake抱怨

CMake Error at src/CMakeLists.txt:44 (add_executable):
add_executable called with incorrect number of arguments

CMake Error at src/CMakeLists.txt:45 (add_executable):
add_executable called with incorrect number of arguments

它说要查看 CMakeOutput.log ，但是文件是真的太久了，我找不到有用的信息。

It says to look at CMakeOutput.log, but the file is really too long, I can not find useful information.

我检查了CMake文档，看来它可能需要第二个来源作为附加参数。 https://cmake.org/cmake/help/v3.0/ command / add_executable.html

I checked the CMake documentation, it seems that it can take a second source as an additional argument. https://cmake.org/cmake/help/v3.0/command/add_executable.html

我想找到此错误的来源。我感觉这里缺少明显的东西。

I would like to find the source of this bug. I have the feeling that I am missing something obvious here.

推荐答案

您收到的错误是因为将源列表传递给 add_executable 实际上是空的。

The error you get is because source list, passed to add_executable, is actually empty.

在 Common / 子目录是：

file(GLOB Common_sources "Common/*.cpp")

---

在命令文件（GLOB） RELATIVE 选项未指定搜索目录。相反，它只是告诉CMake生成相对路径而不是绝对路径：

---

In command file(GLOB) RELATIVE option doesn't specify search directory. Instead, it just tells CMake to generate relative paths instead of absolute:

如果指定了RELATIVE标志，则结果将作为给定路径的相对路径返回。

If RELATIVE flag is specified, the results will be returned as relative paths to the given path.

假设

file(GLOB Common_sources "Common/*.cpp")
# gets: /<path-to-source>/Common/my_source.cpp

然后（还请注意相对选项中的绝对路径）

then (also note to absolute path in RELATIVE option)

file(GLOB Common_sources RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}/Common" "Common/*.cpp")
# gets: my_source.cpp

和（当文件不在 RELATIVE 目录下时）

and (when files are not under RELATIVE directory)

file(GLOB Common_sources RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}/Mps" "Common/*.cpp")
# gets: ../Common/my_source.cpp

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