Compile an SDL project using gcc? - c

Question

How can I compile a sdl project using gcc in the linux command line without using Cmake?
EDIT;
gcc SDLGAME.c pkg-config --cflags --libs sdl2
but i get error.
gcc: error: Pkg-config: No such file or directory
gcc: error: sdl2: No such file or directory
gcc: error: unrecognized command line option ‘--cflags’
gcc: error: unrecognized command line option ‘--libs’; did you mean ‘--libs=’?
#HolyBlackCat
source code --->>
#include <stdio.h>
#include <SDL2/SDL.h>
int main(int argc,char *argv[])
{
if (SDL_Init(SDL_INIT_VIDEO) !=0)
{
printf("error SDL");
return 0;
}
SDL_Window* win=SDL_CreateWindow("Game",
SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED,
500,500,0);
return 0;
}
I get this error--->>
error: XDG_RUNTIME_DIR not set in the environment.
error SDL

Answer 1

Caveat: This isn't a total solution but some suggestions and is prefaced by top comment's and comments under OP's [now deleted] answer.
To review ...
After fixing the original issue by use of:
gcc -o SDLGAME SDLGAME.c `pkg-config --cflags --libs sdl2`
OP running the program produces:
error: XDG_RUNTIME_DIR not set in the environment.
This may be a general issue about the ubuntu install itself. Some resources for that: https://askubuntu.com/questions/872792/what-is-xdg-runtime-dir and
https://askubuntu.com/questions/456689/error-xdg-runtime-dir-not-set-in-the-environment-when-attempting-to-run-naut
A workaround may be:
export XDG_RUNTIME_DIR=/tmp/dir
mkdir -p /tmp/dir
But, I ran the program successfully on my home system, running fedora 29 and my ubuntu system running 18.04.5
On my systems, XDG_RUNTIME_DIR was set to /run/user/1000. However, with/without the workaround and even doing unset XDG_RUNTIME_DIR worked on my systems.
However: On my ubuntu system, I had removed the standard libsdl2 package and rebuilt and installed it from the source package a year ago due to some issues I had.
So, if the workaround doesn't work, I recommend libsdl2 rebuild/reinstall from source.
Even if the standard package is working, when debugging your app, it can be helpful to be able to consult the libsdl2 source.
Note that one change I made to your app was to add a sleep(3) at the bottom so you can see the window come up.
Here is the method I used to build/install from source:
It's probably necessary to uninstall/remove the binary libsdl2 package. So, you'll have to do (e.g.)
sudo apt-get remove libsdl2 libsdl2-dev
Or, whatever the binary package is called [I forget]. But, those also came from: apt-cache search libsdl2
So, once that's cleaned out, what I did was:
Create a directory (e.g.): $HOME/aptsrc
cd $HOME/aptsrc
Download the source package [without sudo]: apt-get source libsdl2
This extracts several files (e.g. *.tar.gz, *.tar.xz, *.dsc and a directory. On my system, it was: libsdl2-2.0.8+dfsg1, but for you it may be different. Do (e.g.): DIR=$HOME/aptsrc/libsdl2-2.0.8+dfsg1
cd $DIR
Configure with: $DIR/configure
Run cmake: cmake $DIR
Run make with: make
Install with: sudo make install
Note that this comes from an internal script I created. Even after the cd $DIR, I think it's necessary to use full path on the commands [where indicated].
Now, the library should be installed under /usr/local. The output of pkg-config --cflags --libs sdl2 should reflect this:
-D_REENTRANT -I/usr/local/include/SDL2 -L/usr/local/lib -Wl,-rpath,/usr/local/lib -Wl,--enable-new-dtags -lSDL2
The original output of this command would have looked like:
-I/usr/include/SDL2 -D_REENTRANT -lSDL2
This is for the standard install from the binary package, so if you still have that, the binary package may still be installed.
Otherwise, you should now be able to rebuild your app using the original gcc command. Now, it should be attached to the source built version of the library. You can confirm this with: ldd ./SDLGAME but just running it might be easier.