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Help => General => Topic started by: marmal102 on April 29, 2017, 10:22:15 am

Title: undefined references to... On Windows
Post by: marmal102 on April 29, 2017, 10:22:15 am

Hello everyone,

I have encountered a strange problem recently while trying to configure CLion with SFML on Windows.
I did it many times and it worked perfectly but now I am getting many problems such:

undefined reference to `_imp___ZN2sf9VideoModeC1Ejjj'

Whole list of that problems. I know it is the problem with linking but I don't know why.
SFML is detected by CMake, the same version of SFML works in Visual Studio.

FindSFML.cmake is original from SFML package downloaded.

Here is my CMakeLists.txt:

Code: [Select]

cmake_minimum_required(VERSION 3.7)
project(untitled)

set(CMAKE_CXX_STANDARD 14)
set(SOURCE_FILES main.cpp)
set(SFML_ROOT "D:/Development/SFML-2.4.2")
add_executable(untitled ${SOURCE_FILES})

set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake_modules")
find_package(SFML REQUIRED COMPONENTS audio graphics window system)
if (SFML_FOUND)
    include_directories(${SFML_INCLUDE_DIR})
    target_link_libraries(untitled ${SFML_LIBRARIES})
endif()


Title: Re: undefined references to... On Windows
Post by: sjaustirni on April 29, 2017, 10:32:54 am

EDIT: This is not the cause of the error. See the post by eXpl0it3r.

You're not linking main (https://www.sfml-dev.org/tutorials/2.4/start-vc.php).

Personally, I use this setup for cross-platform linking

if(MSVC) # Hide console window on Windows
    set_target_properties(${EXECUTABLE_NAME} PROPERTIES  LINK_FLAGS "/SUBSYSTEM:WINDOWS")
    find_package(SFML 2 REQUIRED main system window graphics network audio)
else() # Linux doesn't need the special care
    find_package(SFML 2 REQUIRED system window graphics network audio)
endif(MSVC)

if(SFML_FOUND)
  include_directories(${SFML_INCLUDE_DIR})
  target_link_libraries(${EXECUTABLE_NAME} ${SFML_LIBRARIES})
endif()

Title: Re: undefined references to... On Windows
Post by: eXpl0it3r on April 29, 2017, 11:37:25 am

The CMake script looks fine. So my guess is that your compiler isn't matching your SFML libs.
What's your exact compiler and where did you get SFML from?

Quote from: sjaustirni on April 29, 2017, 10:32:54 am

You're not linking main (https://www.sfml-dev.org/tutorials/2.4/start-vc.php).

While that is a true statement, it has nothing to do with the linker error. ;)

Also the recommended way to set the subsystem is to use the follow code:

add_executable(name WIN32 ${SOURCES})

With that code in place the check can be changed from MSVC to Windows as it will also work with MinGW.

Title: Re: undefined references to... On Windows
Post by: sjaustirni on April 29, 2017, 01:02:59 pm

You're right, I have just seen the combo "windows linking failing" and "sfml-main not linked" and assumed the wrong conclusion.

Thanks for the comment about setting the window subsystem. I will implement it once I boot Windows again. I am glad I haven't taken it out as an irrelevant piece of code as you would have not made the comment then :D

Title: Re: undefined references to... On Windows
Post by: marmal102 on April 29, 2017, 01:30:03 pm

But I wrote I am using CLion with MinGW.
GCC Version is 5.3.0.

Title: Re: undefined references to... On Windows
Post by: eXpl0it3r on April 29, 2017, 07:19:30 pm

MinGW GCC 5.3.0 can be a lot. There are many different variations of MinGW, thus you need to be more specific. Where did you download said MinGW version?

Title: Re: undefined references to... On Windows
Post by: marmal102 on April 30, 2017, 11:11:27 am

I got it from here: http://www.mingw.org/category/wiki/download
Then I downloaded Installer from: https://sourceforge.net/projects/mingw/files/Installer/
And installed gcc compiler from here.

Title: Re: undefined references to... On Windows
Post by: eXpl0it3r on April 30, 2017, 12:35:41 pm

Then you'll have to build SFML yourself as we don't provide any binaries for that MinGW version. See the links on the download page if you want to get a matching compiler.

Title: Re: undefined references to... On Windows
Post by: marmal102 on April 30, 2017, 03:40:46 pm

Yes... I really forgot about matching compiler to downloaded SFML..
Shame on me :) Thanks, works well.