unresolved inclusion <GL/glut.h> - c++

I am trying to get opengl to work with eclipse and I keep getting the following error
unresolved inclusion
however when i run some sample code it still works, it's just an issue of loads of errors showing up- which would make debugging next to impossible.
this is my path

GLUT is not a standard library, shipping with the OpenGL development resources. Most likely you either don't have installed GLUT or the examples you were compiling did configure additional include file search directories in their build options.
Make sure you have installed GLUT and your project build options cover the include and library paths the GLUT development files have been installed to.

You probably don't have the GL directory in your include path.

Related

Xcode framework no longer found after second build

Since I upgraded to Xcode 11 every new project I start that includes a framework can be no longer be compiled after the second build of the project.
For example including SDL2 using this command:
#include <SDL2/SDL.h>
will result in this error:
'SDL2/SDL.h' file not found
after the project has been compiled a second time.
Projects that have been created in Xcode 10 work normal in Xcode 11.
I tried changing the embedding options of the frameworks but no setting works. This error occurs in all Xcode 11 versions (0 - 2.1).
I am using macOS Version 10.14.6.
Why does this happen or how can this be fixed?
I hade the same problem with XCode 11.1. What I found out was that I needed to add the Header Search Path in Build Settings/Search Paths to:
/Library/Frameworks/SDL2.framework/Versions/A/Headers
And then it worked. It looks like the path is changed.
I finally found a solution. I added the frameworks with the menu in this screenshot to my project:
In Xcode 9 and 10 this did the same as adding the framework using this menu:
But now in Xcode 11 this isn't the same anymore. Adding the framework using the first menu will copy the framework from it's original path into the build folder of the project but for some reason Xcode does not copy the Headers folder in the framework. I think this is a bug but it seems like they haven't fixed it up to Xcode version 11.2.1 at least.
So now the solution to this problem is adding the framework using the Build Phases menu in the second picture.
SDL2 isn't a framework. Rather it is either a static or dynamic lib. Unless of course you are using some other custom made framework for SDL2.
There are two scenarios you would typically encounter:
SDL2 installed in the default location such as /usr/local
SDL2 installed in a custom place (which is how I do it)
I am guessing you are doing the former. If this is the case, it is possible that with Xcode 11 the default system header search path has somehow changed to not include /usr/local (or where you have installed it).
To fix this, you should first locate your SDL2 library. In particular where the include files are.
Then in Build Settings, go to Search Paths:System Header Search Paths and enter that path in.
Keep in mind the #include is using SDL2 as part of the path, so you do not want to put the SDL2 part in the path. Here is an example of my directory structure. So my path entry for this is $(PROJECT_DIR)/3rdParty/SDL2/include. You can see in my project directory, I have a 3rdParty directory which I use to hold the 3rd Party libs I integrate into the project.
You're using angled brackets for inclusion, which utilizes the system path.
Note you also may have to do update how you link against SDL2 (ie. it may not be able to find it).

How can Codeblocks find my header files even without adding any search paths

I'm learning to use OpenCV (and C++) in Codeblocks. What confuses me, however, is that when I start to include header files from OpenCV in my main.cpp file, Codeblocks automatically suggests to me the files as shown in the image below.
I have not included any search paths to project build options, so how is this possible that Codeblocks can find the files? Is there some other variable working here that I'm unaware of?
Note that I'm a beginner with both Codeblocks and OpenCV and that I only have a little experience with C++.
Thank you
Of course when you install an IDE like code::blocks by default, it knows about standard path for library on your OS.
On my OS -> Ubuntu that is /usr/include
It only searches on a standard path, except you add one. If you install your library by command-line, it goes to the standard place, if you installed manually, then it depends on your option you added to installation. I can not see you screen-shot but it has access to /usr/include by default.
For more detail on Linux and OpenCV
And here is a screen-shot of codeblock on Ubuntu that I added some 3rd-party library
NOTE:
if you install any libraries by command-line, just use it.
But if you have installed them manually, you need to add 2 things to codeblock.
1. First is your path for header file
2. Second is your path for linker
And you see it in screen-shot that say: Search Directory
First is for header and second is for linker

glfw3 for code::blocks 16.01 in ubuntu

I am facing a really for me time-expensive problem. I am new to ubuntu and want to start learning more about opengl by using the glfw. Of course I cannot switch the OS so I will have to stay at ubuntu. I have come so far that I installed the glfw( by following this "tutorial": 2. step by filipwasil), so I have got an include directory in the usr/local dir, aswell as a lib directory. The include directory contains the glfw3.h and the lib directory the libglfw3.a file. If I try to add them to my project in code::blocks it seems like only the include part works, because I can see the functions provided by the glfw while typing, but once I want to compile and run the project, I get an error for each glfw function call: like "not defined reference to e.g. glfwInit". The lib directory also contains a cmake dir, which contains glfwconfig and glfwtarget files, but I really do not know what these files should do. I also noticed the question by Artur, which is quiet identical, but it does not help me because I want to know which files exactly I have to add in order to get a running window. So may question is: How is it possible to make the code::blocks IDE, actually the gcc compiler, know whats behind the glfw functions?
Every help will be appreciated. Sorry for my bad english. :)
Add GL, GLEW and glfw in the linker settings. Note the "glfw" in lowercase

Adding boost library to cocos2d-x project in xcode?

I've stumbled upon a problem trying to build a cross-platform app using cocos2d-x. Currently I'm trying to build for Mac OSX. I've tried linking to the boost header files but I keep getting errors stating boost/shared_ptr.hpp cannot be found. I'm only using the smart pointer headers.
I've added the root boost directory to Header Search Paths: $(SRCROOT)/../../boost_1_55_0 (non-recursive)
and the libs directory to Library Search Paths: $(SRCROOT)/../../boost_1_55_0/libs (non-recursive)
I tried this for both the root project file and cocos2d_libs project file with no good results.
I also tried adding to User Header Search Paths.
I've added them successfully on an SFML project, so does cocos2d-x bypass these search paths?
Thanks to anyone who is willing to help me!
Probably you have missed some step in your setup. Have a double check on every detail as you can go through these guidelines:
Porting a Cocos2d-x iOS game to Android
How to create a multi-platform project in one command line
This should help, as attention to detail if worthwhile.
I never figured out the problem, but I realise now that there's no need to even use boost. Cocos2d-x is compatible with C++11. What a relief.
Since XCode builds Cocos2DX projects for Mac and iOS you need to setup header search paths independently. Just switch target in XCode from iOS to Mac and set path to Boost for Mac build. Should work.

SDL.h not found on g++ compile

Using OSX and vim...
Downloaded SDL2 from the website, then moved the SDL2.framework into /Library/Frameworks/
Using tutorial code, and Makefile... SDL.h is not found.
Makefile: g++sdl-config --cflags --libssdltest.cpp -o sdltest
I've read numerous things about pointing the compiler to the framework, but everything I've tried doesn't seem to work, and I thought /Library/Frameworks/ was the default area for the compiler to look
Got it to work.
Getting this to work took multiple tries, but the root of the issue for each try was that most of the Tutorials I was looking at were for SDL1.2 when I was using SDL2.
This changed flags in the make file, directories to search in and other things. Interestingly, I could never get the compiler to see SDL.h when it was in the /Library/Frameworks/ directory. However using Macports to install SDL2 allowed me to point the compiler to where Macports installed SDL2 header files - /opt/local/include/SDL2
That seems to have done it for me
Thank you for your question, because I was having similar difficulties! There seems to be a dearth of detailed and helpful tutorials on how to install SDL2 using Macports.
I got it working! Here are the steps:
Visit this link to find the Macports package appropriate for your version of Mac OS X. Install the version you need, and once that is done, proceed to step 2.
https://www.macports.org/install.php
After installation is done, visit this link to find the SDL2 port.
https://www.macports.org/ports.php?by=name&substr=libsdl
The one I needed was the third from the top, called libsdl2. I will be providing the name for you so feel free to visit the link simply for your own edification.
Open the Terminal, and type sudo port install libsdl2. If all goes to plan, you should see it installing and updating. Once it is complete, you should have a functional installation of the SDL2 Header files, (ending in .h), Static Library files (ending in .a) and Dynamic Library files (which contain dylib). You may have to do some poking around in Finder to locate where it installed.
The advantage of this workaround is the ability to use SDL with other IDE's besides Xcode, Eclipse for instance. Whereas Xcode requires you to assign a path of /Library/Frameworks, this technique should allow you to use the IDE of your choosing.
The final step is going into your IDE and assigning the build paths to these newly installed and compiled SDL files. For instance, the paths for mine are /opt/local/include and /opt/local/lib. Be mindful of the fact that your path may differ from these, but these examples should give you an idea of where to look.
Hopefully this is helpful for somebody!