Segmentation fault upon launch

[jmcph4]

System Information

Operating System

$ uname --all
Linux foobar 4.19.0-16-amd64 #1 SMP Debian 4.19.181-1 (2021-03-19) x86_64 GNU/Linux

Application

9c03ea4

Actual Behaviour

After successful build, the program crashes with a segmentation fault after (very) briefly rendering a (blank) window:

$ sudo apt-get install libsdl2-dev
$ make
cc -O2 -Wall -Wno-return-type -Wno-misleading-indentation -lSDL2 -o pokegb pokegb.cc
$ ./pokegb
Segmentation fault

Expected Behaviour

No segmentation fault.

[yaakov-h]

I got the same thing after compiling on macOS:

yaakov@Ilum pokegb % clang++ pokegb.cc -I/opt/homebrew/include -lsdl2 -L/opt/homebrew/lib -o pokegb 
pokegb.cc:20:72: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
                     using z=                                          uint8_t;                                          using Z=
                                                                       ^
pokegb.cc:21:17: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
                uint16_t;using I=                                 int;z o,m,u,x,c,n,                                 *r0,*r1,i[512],v
                ^
pokegb.cc:21:67: warning: alias declarations are a C++11 extension [-Wc++11-extensions]
                uint16_t;using I=                                 int;z o,m,u,x,c,n,                                 *r0,*r1,i[512],v
                                                                  ^
pokegb.cc:31:45: warning: non-void function does not return a value in all control paths [-Wreturn-type]
    12 ...14:a&=16383;if(w)r4[a]=x;K r4[a];}}z        r(Z a=H){K me(a,0,0);}void w(z x,Z a=H){me        (a,x,1);}void f(z M,I Z,I N,I H,I C){F=(F&
                                            ^
4 warnings generated.
yaakov@Ilum pokegb % ./pokegb 
zsh: segmentation fault  ./pokegb

I would assume that it is the same segmentation fault, though I have no way to tell.

[binji]

Did you put the pokemon rom in a file called rom.gb in the same directory? Without that it won't work.

[LF-Lin]

Maybe you can try this:
Google Pokemon blue version rom, and download a file with .gb, then rename it to rom.gb

[yaakov-h]

ah, I had the filename wrong.

After fixing that it now segfaults about 15 seconds in, right after the Jigglypuff headbutts Gengar and the screen fades to white.

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   pokegb                        	0x0000000102a019f0 me(unsigned short, unsigned char, int) + 240
1   pokegb                        	0x0000000102a02788 main + 2888
2   pokegb                        	0x0000000102a02788 main + 2888
3   libdyld.dylib                 	0x000000019ff2d450 start + 4

[binji]

@yaakov-h yeah, that's the same issue as #1. Seems like the simplest workaround is to create an empty 32768 byte file called rom.sav, but it'd be nice to fix.

[jmcph4]

Did you put the pokemon rom in a file called rom.gb in the same directory? Without that it won't work.

That would help! Solved this issue for me, so I'm willing to mark as closed.