CMake在include_directories中找不到正确的头文件/包含文件 [英] CMake not finding proper header/include files in include_directories

问题描述

再次，当我尝试编译时，出现未定义的体系结构x86_64符号错误。我已经做了很多尝试，超出了我在这篇帖子中实际记录的范围（因为我已经忘记了所有尝试过的内容）。这是一个非常简单的设置，并且应该使用CMake可以非常容易地进行编译...

当我对此进行make运行时，精细。但我想将其转换为CMake以实现互操作性。如您所见，我在一些地方抛出了 $ {HEADERS}变量，我已经尝试了很多地方，但是我不断遇到错误。根据我放置$ {HEADER}的位置，它还可以从技术上生成错误错误：生成多个输出文件时无法指定-o（如果 only 仅位于target_link_library声明中，则适用） 。

我有2个文件夹：

 根
标头（包含所有.h文件）
源文件（包含所有.cc / .cpp / .c文件）（以及CMakeLists.txt）
 CMakeLists.txt 
  

我的根CMakeLists.txt包含以下内容：

  cmake_minimum_required（版本2.8.4）
项目（框架）
 
设置（CMAKE_CXX_FLAGS $ {CMAKE_CXX_FLAGS} -std = c ++ 11）
 add_compile_options（ -v）
 
 add_subdirectory（来源）
 
＃使我的生活更加轻松并添加标题
 set（H Headers）
 include_directories（ $ {H}）
 set（S源）
文件（GLOB HEADERS 
＃在标题dir 
中添加任何文件 $ {H} / * 
 ）
 
＃创建一个变量用于main.cc 
 set（MAIN $ {S} /main.cc $ {HEADERS}）
 
＃添加main.cc文件和标题
 add_executable（Framework $ {MAIN} $ {HEADERS}）
 
＃添加.cc / .cpp文件
 target_link_libraries（框架$ {SOURCE_FILES}）
  

我的源目录中的CMakeLists.txt包含以下内容：

  file（GLOB源
 * .cc 
 * .cpp 
）
 
 add_library（SOURCE_FILES $ {SOURCES}）
  

按照我的说法，我认为标题中没有一个，我们认为不需要。 / p>

感谢您的帮助。我看过：

• 包含来自其他目录的h个文件的cmake


• http://www.cmake.org/cmake/help/v2.8.0/cmake.html （均适用于版本2.x和3 .x）


• CMake将标头添加到Projectfile -有解决方案的潜力，但最后说我不知道：（


• 以及许多其他各种邮件列表和其他站点

解决方案

此处的主要问题是您指的是 SOURCE_FILES target，就好像它是一个变量。删除美元符号和花括号。

  target_link_libraries（Framework SOURCE_FILES）
  

如果您在调用 add_subdirectory 之后设置了 include_directories ，我会感到惊讶，如果这样做有效。

总体而言，我认为您正在使事情变得比他们需要的复杂。

顶级CMakeLists.txt

  cmake_minimum_required（版本2.8）
项目（框架CXX）
 
 set（CMAKE_CXX_FLAGS $ {CMAKE_CXX_FLAGS} -std = c ++ 11 -Wall -Wextra -pedantic）
 
 include_directories（
 $ {PROJECT_SOURCE_DIR} / Headers 
）
 
 add_subdirectory（Source）
  

Source / CMakeLists.txt

 ＃请勿使用文件查看，因为CMake不能在重建项目时告诉文件
＃是否已删除或添加。 
 set（HELLO_LIB_SRC 
 hello.cc 
）
 add_library（hello $ {HELLO_LIB_SRC}）
 
 set（MAIN_SRC 
 main.cc 
）
 add_executable（hello_bin $ {MAIN_SRC}）
 target_link_libraries（hello_bin你好）
  

标题/hello.h

  #pragma一次
 
 #include< string> 
 
名称空间nope 
 {
 std :: string hello_there（）; 
} 
  

来源/hello.cc

  #include< hello.h> 
 
命名空间为
 {
 std :: string hello_there（）
 {
 return Well hello there！; 
} 
} 
  

来源/main.cc

  #include< hello.h> 
 #include< iostream> 
 
 int main（）
 {
 std :: cout<< nope :: hello_there（）<< std :: endl; 
返回0； 
} 
  

不要担心文件在build文件夹中的位置。

  $ mkdir build&& cd build 
 $ cmake -DCMAKE_BUILD_TYPE =调试.. 
 $ make 
  

Once again I am getting a "undefined symbols for architecture x86_64" error when I try to compile. I've tried more than I can actually document in this post (because I've forgotten all that I have tried). It is a really simple set-up and should compile very easily with CMake...

When I run a make on this it works just fine. But I want to convert it to CMake for interoperability. As you can see I have thrown my "${HEADERS}" variable in a few places, I've tried quite a few placements of it but I keep getting my error. Depending on where I put that ${HEADER} it can also technically generate an error of "error: cannot specify -o when generating multiple output files" (That applies if it only sits in the target_link_library declaration).

I have 2 folders:

Root
    Headers (contains all .h files)
    Source (contains all .cc/.cpp/.c files) (and also a CMakeLists.txt)
CMakeLists.txt

My root CMakeLists.txt contains the following:

cmake_minimum_required(VERSION 2.8.4)
project(Framework)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
add_compile_options("-v")

add_subdirectory(Source)

#Variables for making my life easier and adding the headers
set(H Headers)
include_directories(${H})
set(S Source)
file(GLOB HEADERS
#Add any file in the headers dir
"${H}/*"
)

# Create a variable to use for main.cc
set(MAIN ${S}/main.cc ${HEADERS})

# Add the main.cc file and headers
add_executable(Framework ${MAIN} ${HEADERS})

# Add the .cc/.cpp files
target_link_libraries(Framework ${SOURCE_FILES})

My CMakeLists.txt in my source directory contains the following:

file(GLOB SOURCES
"*.cc"
"*.cpp"
)

add_library(SOURCE_FILES ${SOURCES})

I do not have one in the headers as per, what I believe, the documentation states we don't need.

Thanks for the help. I've looked at:

• cmake including h files from other directories
• http://www.cmake.org/cmake/help/v2.8.0/cmake.html (both for version 2.x and 3.x)
• CMake Adding Headers to Projectfile -- had a potential for a solution but ended up saying "I don't know" :(
• and many other various mail lists and other sites

解决方案

The main problem here is that you're referring to the SOURCE_FILES target as if it was a variable. Remove the dollar sign and curly braces.

target_link_libraries(Framework SOURCE_FILES)

It also seems kind of weird that you set include_directories after calling add_subdirectory, I'd be surprised if that worked.

Overall I think you're making things more complicated than they need to be. The following should be all that's necessary.

Top level CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
project(Framework CXX)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wextra -pedantic")

include_directories(
  ${PROJECT_SOURCE_DIR}/Headers
)

add_subdirectory(Source)

Source/CMakeLists.txt

# Do not use file globing because then CMake is not able to tell whether a file
# has been deleted or added when rebuilding the project.
set(HELLO_LIB_SRC
  hello.cc
)
add_library(hello ${HELLO_LIB_SRC})

set(MAIN_SRC
  main.cc
)
add_executable(hello_bin ${MAIN_SRC})
target_link_libraries(hello_bin hello)

Headers/hello.h

#pragma once

#include <string>

namespace nope
{
  std::string hello_there();
}

Source/hello.cc

#include <hello.h>

namespace nope
{
  std::string hello_there()
  {
    return "Well hello there!";
  }
}

Source/main.cc

#include <hello.h>
#include <iostream>

int main()
{
  std::cout << nope::hello_there() << std::endl;
  return 0;
}

Do not worry about the placement of files in the build folder. That's for the install step to figure out.

$ mkdir build && cd build
$ cmake -DCMAKE_BUILD_TYPE=Debug ..
$ make

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