CMake找不到源文件(add_executable) [英] CMake cannot find source file (add_executable)

问题描述

我一直在尝试遵循供应商的教程: CMake教程，请在此处查看文档: Cmake文档，并通过以下来源尽可能地教育自己YouTube，但我真的很难为使用OpenGL的环境进行设置.修完了Glitter样板以及open.gl和Learnopengl.com上的教程之后，我决定了解构建过程非常重要，不值得研究.

I have been trying to follow the vendor's tutorial here: CMake-Tutorial, look over the documentation here: Cmake-Documentation, and educate myself as best as possible with sources on YouTube, but I am really struggling with getting the environment set up for working with OpenGL. Having tinkered with the Glitter boilerplate and the tutorials on open.gl and learnopengl.com, I've decided that understanding the build process is too important not to investigate.

在我的调查中，我遇到了CMake错误找不到源文件"，下面将更详细地显示该错误.该问题似乎是由于"add_executable"引起的.

In my investigation, I have come across the CMake error "cannot find source file" which is shown below in more detail. The problem seems to be arising from "add_executable".

此处提出了类似的问题: CMake-找不到文件.解决方案包括确保为每个变量正确设置$ {PROJECT_SOURCE_DIR}，我相信我已经做到了.

A similar question was asked here: CMake - Cannot find file. The solution involved ensuring that the ${PROJECT_SOURCE_DIR} was set properly for each variable, which I believe I have done.

我的文件结构:

+ infuriating_project
    + bin // post compile results
    + src // my humble code
    + deps // external code
        +glew
            + include
            + src
        +glfw
            + include
            + src
        +glm
        +soil
            + lib
            + src

我的CMakeLists.txt:

My CMakeLists.txt:

cmake_minimum_required (VERSION 3.0)


# Version Information ---------------------------------------------------------
project (openGL-practice)
SET (VERSION_MAJOR 1)
SET (VERSION_MINOR 0)
SET (VERSION_FEATURE 0)
SET (VERSION_PATCH 0)
SET (VERSION "${VERSION_MAJOR}.${VERSION_MINOR}")
SET (VERSION "${VERSION}.${VERSION_FEATURE}.${VERSION_PATCH}")
MESSAGE ("Version: ${VERSION}")

# Configure Source & Binary Directories ---------------------------------------
SET (PROJECT_ROOT "${PROJECT_SOURCE_DIR}")
SET (PROJECT_SOURCE_DIR "${PROJECT_SOURCE_DIR}/src")
SET (PROJECT_BINARY_DIR "${PROJECT_BINARY_DIR}/bin")
MESSAGE ("Source path: ${PROJECT_SOURCE_DIR}")
MESSAGE ("Binary path: ${PROJECT_BINARY_DIR}")

# Configure Depenency Directories ---------------------------------------------
SET (PROJECT_DEPS "${PROJECT_ROOT}/deps")
SET (glew_inc "${PROJECT_DEPS}/glew/include/GL/")
SET (glew_src "${PROJECT_DEPS}/glew/src/")
SET (glfw_inc "${PROJECT_DEPS}/glfw/include/GLFW/")
SET (glfw_src "${PROJECT_DEPS}/glfw/src/")
SET (glm "${PROJECT_DEPS}/glm/glm/")
SET (soil_lib "${PROJECT_DEPS}/lib/")
SET (soil_src "${PROJECT_DEPS}/src/")

# Include directories ---------------------------------------------------------
include_directories("
    ${PROJECT_SOURCE_DIR}
    ${PROJECT_BINARY_DIR}
    ${glew_inc}
    ${glew_src}
    ${glfw_inc}
    ${glfw_src}
    ${glm}
    ${soil_lib}
    ${soil_src}
    ${PROJECT_ROOT}
    ")

# Add executable --------------------------------------------------------------
add_executable(main main.cpp)

提供以下错误:

CMake Error at CMakeLists.txt:46 (add_executable):
  Cannot find source file:

    main.cpp

  Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp
  .hxx .in .txx


CMake Error: CMake can not determine linker language for target: main
CMake Error: Cannot determine link language for target "main".

我们将不胜感激.

推荐答案

我想提一些要点.

1. include_directories帮助查找头文件.源文件必须始终具有完整的相对路径.

1. include_directories helps for finding header files. Source files must always have a complete relative path.

假设您的main.cpp在src内，则正确的语法是

Assuming that your main.cpp is within src, the correct syntax is

add_executable(main ${PROJECT_SOURCE_DIR}/main.cpp)

包含${PROJECT_BINARY_DIR}没有任何意义.

Including ${PROJECT_BINARY_DIR} does not make sense.

覆盖诸如${PROJECT_SOURCE_DIR}之类的CMake默认变量不是一个好习惯.将来，您将永远记住您已经做过这样的事情，对于另一个程序员来说，这是非常意外的.

Overwriting CMake default variables like ${PROJECT_SOURCE_DIR} is no good practice. In future you will always remember that you have done such a thing and for another programmer it is quite unexpected.

希望有帮助.

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