C program using SDL2 will not compile with clang - c

Question

I am having an issue trying to compile my C program. I'm on macOS Catalina and using clang to compile.
When I try to SDL_Init( SDL_INIT_VIDEO ); and compile clang tells me there is a linker command failure
Undefined symbols for architecture x86_64:
"_SDL_Init", referenced from:
_main in main-1defaf.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I used brew to install SDL2 with brew install SDL2. So these are flags I have tried to have clang pass to the linker but neither one worked.
> clang main.c -L/usr/local/Cellar/sdl2/2.0.12_1/include/SDL2
> clang main.c -L/usr/local/Cellar/sdl2/2.0.12_1/include/SDL2 \
-L/usr/local/Cellar/sdl2/2.0.12_1/lib
Since they did not work I then tried to add the -framework flag. I followed the instructions I found here to install the framework. However the website didn't mention how to use it with clang. Clangs documentation did not mention if I needed to point to the framework file or directory so I tried a couple different ways but could not get any to work.
> clang main.c -L/usr/local/Cellar/sdl2/2.0.12_1/include/SDL2 \
-framework SDL2
ld: framework not found SDL2
clang: error: linker command failed with exit code 1 (use -v to see invocation)
> clang main.c -L/usr/local/Cellar/sdl2/2.0.12_1/include/SDL2 \
-framework /Library/Framework/SDL2.framework
ld: framework not found /Library/Framework/SDL2.framework
clang: error: linker command failed with exit code 1 (use -v to see invocation)
> clang main.c -L/usr/local/Cellar/sdl2/2.0.12_1/include/SDL2 \
-framework /Library/Frameworks/SDL2.framework/SDL2
ld: framework not found /Library/Frameworks/SDL2.framework/SDL2
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I have also tried to just use XCode to compile and it builds successfully however fails to run with the error below. I followed the instructions in the tutorial linked above.
2020-06-30 16:07:36.220432-0700 sdl_test[1867:31873] Metal API Validation Enabled
2020-06-30 16:07:36.273590-0700 sdl_test[1867:32300] flock failed to lock maps file: errno = 35
2020-06-30 16:07:36.274022-0700 sdl_test[1867:32300] flock failed to lock maps file: errno = 35
Program ended with exit code: 0
I have restarted the computer and cleaned the build and based on some google searches it seems like this was introduced in a recent version of XCode that needs to be resolved.
I would like to stick with clang and not sure what else I can try to get this to compile. I would like to get some direction on next steps.
This is the code I am trying to run.
#include <SDL2/SDL.h>
#include <stdio.h>
int main(int argc, const char * argv[]) {
SDL_Init( SDL_INIT_VIDEO );
return 0;
}

Answer 1

You're missing the -lSDL2 to bring in the shared library, and if you're going to use /usr/local/Cellar/sdl2/2.0.12_1/include/SDL2 you should only #include <SDL.h>.
Consider using pkg-config to handle include and link flags.
clang main.c -o main `pkg-config --libs --cflags sdl2`