CODEWITHSUNDEEP
c++mingwsdl-2ldundefined-reference
okistuff
okistuff

Reputation: 85

Undefined Reference to `SDL2_Init` with LD when G++ is not giving an error

I'm trying to setup SDL2 with MinGW and I have everything set up beside one thing. Whenever I try to compile G++ gives no errors but then LD gives me a: undefined reference to SDL_Init Error.

c:/mingw/bin/../lib/gcc/mingw32/9.2.0/../../../../mingw32/bin/ld.exe: C:\Users\user\AppData\Local\Temp\cc28dE2R.o: in function `SDL_main':
C:\Users\user\Documents\SDL2/src/main.cpp:11: undefined reference to `SDL_Init'
c:/mingw/bin/../lib/gcc/mingw32/9.2.0/../../../../mingw32/bin/ld.exe: C:\Users\user\Documents\SDL2/src/main.cpp:14: undefined reference to `SDL_GetError'
c:/mingw/bin/../lib/gcc/mingw32/9.2.0/../../../../mingw32/bin/ld.exe: C:\Users\user\Documents\SDL2/src/main.cpp:18: undefined reference to `IMG_Init'
c:/mingw/bin/../lib/gcc/mingw32/9.2.0/../../../../mingw32/bin/ld.exe: C:\Users\user\Documents\SDL2/src/main.cpp:20: undefined reference to `SDL_GetError'
c:/mingw/bin/../lib/gcc/mingw32/9.2.0/../../../../mingw32/bin/ld.exe: c:/mingw/bin/../lib/gcc/mingw32/9.2.0/../../../libmingw32.a(main.o):(.text.startup+0xc0): undefined reference to `WinMain@16'
collect2.exe: error: ld returned 1 exit status
The terminal process "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -Command C:\MinGW\bin\g++.exe -g src\*.cpp -o build\game.exe -ID:C:\MinGW\include -LD:C:\MinGW\lib -mwindows -lmingw32 -lSDL2main -lSDL2_image -lSDL2" terminated with exit code: 1.

I have tried to move the args around. doing -mwindows, adding -lmingw32. I still keep getting the same errors.. I was able to fix the WinMain Error.. But everything else I couldn't fix.

The command I'm Running to compile:

C:\MinGW\bin\g++.exe -g src\*.cpp -o build\game.exe -ID:C:\MinGW\include -LD:C:\MinGW\lib -mwindows -lSDL2main -lSDL2_image -lSDL2

Upvotes: 0

Views: 1406

Answers (1)

HolyBlackCat
HolyBlackCat

Reputation: 96053

The common cause of mysterious undefined reference errors on MinGW is using libraries compiled for x64 with an x32 compiler, or vice versa. SDL ships both x32 and x64 ones, try the other ones.

I was able to fix the WinMain Error

Be aware that the intended way of fixing undefined reference to WinMain@16 is not adding #define SDL_MAIN_HANDLED and not doing #undef main. Once you get the right libraries (see the first paragraph), the error should disappear by itself.

Make sure you use int main(int, char**) (and not int main() nor void main()), otherwise it won't work.

-ID:C:\MinGW\include -LD:C:\MinGW\lib

You shouldn't need those flags. Those directories will be searched automatically.

Since you didn't specify any other directories, I assume you placed the SDL files directly into the compiler directories, which isn't a good practice, IMO.

I assume D:C: a typo?

-mwindows

The only purpose of this flag (that I know of) is to prevent your app from automatically opening a terminal window for itself, for release builds.

Upvotes: 2

Related Questions