libsdl2-ttf-dev and libsdl2-dev headers not at the same place, causing compilation error

[Samuel Hangouët]

Since update to focal, libsdl2 and libsdl2-ttf headers have a different location, causing a compilation error when trying to include SDL2/SDL_ttf.h header :

$ sudo apt install libsdl2-ttf-dev libsdl2-dev
$ echo "#include <SDL2/SDL_ttf.h>" > main.c
$ gcc main.c
In file included from main.c:1:
/usr/include/SDL2/SDL_ttf.h:34:10: fatal error: SDL.h: Aucun fichier ou dossier de ce type
   34 | #include "SDL.h"
      | ^~~~~~~
compilation terminated.

It seems that SDL_ttf.h header expects to be in the same place that SDL ones, which is not the case :

$ dpkg -L libsdl2-ttf-dev
/.
/usr
/usr/include
/usr/include/SDL2
/usr/include/SDL2/SDL_ttf.h
...

$ dpkg -L libsdl2-dev
/.
/usr
/usr/bin
/usr/bin/sdl2-config
/usr/include
/usr/include/x86_64-linux-gnu
/usr/include/x86_64-linux-gnu/SDL2
/usr/include/x86_64-linux-gnu/SDL2/SDL.h
...

[Samuel Hangouët (samuel-hangouet)]

Since last update, the problem has moved, now this error happens:

In file included from /usr/include/SDL2/SDL.h:32:
In file included from /usr/include/SDL2/SDL_main.h:25:
In file included from /usr/include/SDL2/SDL_stdinc.h:31:
In file included from /usr/include/SDL2/SDL_config.h:4:
In file included from /usr/include/x86_64-linux-gnu/SDL2/_real_SDL_config.h:33:
/usr/include/x86_64-linux-gnu/SDL2/SDL_platform.h:179:10: fatal error: 'begin_code.h' file not found
#include "begin_code.h"

A workaround is to add -I/usr/include/SDL2 into compiling flags, but not very clean.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Alexandre-Xavier Labonté-Lamoureux (alexandrexavier)]

I was trying to build my project using Clang++ instead of G++ and I got this issue. I don't use libsdl2-ttf-dev inside my project, but it's installed on my system. I do use SDL2 and SDL2_image. To be clear, G++ compiles my project fine. Clang++ does not. It spits build errors very similar to this one:

1 error generated.
In file included from ticcmd.cpp:22:
In file included from /usr/include/SDL2/SDL_endian.h:31:
In file included from /usr/include/SDL2/SDL_stdinc.h:31:
In file included from /usr/include/SDL2/SDL_config.h:4:
In file included from /usr/include/x86_64-linux-gnu/SDL2/_real_SDL_config.h:33:
/usr/include/x86_64-linux-gnu/SDL2/SDL_platform.h:179:10: fatal error: 'begin_code.h' file not found

My project: https://github.com/AXDOOMER/MeshGlide

Samuel's workaround worked. I was able to compile my project like this:

clang++ *.cpp -std=c++14 -g -lglfw -lGL -lGLU -lSDL2 -lSDL2_image -lzmq -I/usr/include/SDL2 -o MeshGlide

[Paweł Kotiuk (pktiuk)]

In my case this issue seems to be a bit random.
I get this error randomly when I try to rebuild my CMake project.
```
usr/include/x86_64-linux-gnu/SDL2/SDL_platform.h:179:10: fatal error: 'begin_code.h' file not found
```
When it appears I have to remove entire build folder for my app and rebuild it.
My app: https://github.com/AntiMicroX/antimicrox