undefined reference to `main'

[mase]

Hello!
What does this error mean? How can I solve this? It appears, when
compiling openttd.

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/usr/share/psp-dev/bin/../lib/gcc/psp/4.3.2/../../../../psp/lib/crt0.o: In function `_main':
/tmp/psptoolchain/build/pspsdk/src/startup/crt0.c:86: undefined reference to `main'
collect2: ld returned 1 exit status

[jojojoris]

It means the linker can't find any main function.

[mase]

The only main function is

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int ttd_main(int argc, char *argv[])

in openttd.cpp.
Even if I rename ttd_main to main, I get the same error.
But it compiles fine for Linux.
But it is an SDL application. So if I link SDLmain, it should work, but
it doesn't.

[jojojoris]

The only main function is

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int ttd_main(int argc, char *argv[])

in openttd.cpp.
Even if I rename ttd_main to main, I get the same error.
But it compiles fine for Linux.
But it is an SDL application. So if I link SDLmain, it should work, but
it doesn't.

Don't use SDL. It's verry slow. Try oslib as graphics engine.

[mase]

I must use SDL, because it is not my code.
I added -l SDLmain -lSDL in build.mak of the SDK. Now I get

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psp-gcc -I. -I/usr/share/psp-dev/psp/sdk/include  -D_PSP_FW_VERSION=150  -L. -L/usr/share/psp-dev/psp/sdk/lib    -lSDLmain -lSDL  -lpspdebug -lpspdisplay -lpspge -lpspctrl -lpspsdk -lc -lpspnet -lpspnet_inet -lpspnet_apctl -lpspnet_resolver -lpsputility -lpspuser -lpspkernel -o .elf
/usr/share/psp-dev/bin/../lib/gcc/psp/4.3.2/../../../../psp/lib/libSDLmain.a(SDL_psp_main.o): In function `main':
psp/SDL_psp_main.c:86: undefined reference to `SDL_main'
collect2: ld returned 1 exit status

[sauron_le_noir]

if you use SDL_MAIN it declare for you a main() function but within this function
a call has been made to sdl_main(int argc,char **argv) to init you SDL program
so it is normal that you've got a undefined reference to `SDL_main'n if you don't provide a sdl_main function



int main(int argc, char *argv[])
{
pspDebugScreenInit();
sdl_psp_setup_callbacks();

/* Register sceKernelExitGame() to be called when we exit */
atexit(sceKernelExitGame);

(void)SDL_main(argc, argv);
return 0;
}

[mase]

The code does not provide such a function. But the code, that compiles,
doesn't, too.
Maybe you could have a look on it.
The one I am working on is here:
http://www.openttd.org/en/
It is the version 0.7.2, which I configured

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./configure --os=psp --host=psp --with-sdl=/usr/share/psp-dev/psp/bin/sdl-config --with-allegro=/usr/share/psp-dev/psp/bin/psp-allegro-config --with-freetype=/usr/share/psp-dev/psp/bin/freetype-config

The working one is here:
http://sourceforge.net/projects/openttd-psp
It is the version 0.5.3, which compiles and runs fine.
But as I said, both don't provide such a function.

[psPea]

if you're using -lSDLmain
the you need to define SDL_main and use that as your main function

[mase]

Yes, but the working code doesn't provide a SDL_main function, too.
So how can it run?

[J.F.]

Yes, but the working code doesn't provide a SDL_main function, too.
So how can it run?

Buried in the makefile(s) somewhere is probably a define for SDL_main that sets it to ttd_main.

[mase]

No, there isn't. Please check the code, if you don't believe me.

[J.F.]

Okay, main() is in the platform specific code like os2.cpp. In os2.cpp you find:

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int CDECL main(int argc, char *argv[])
{
	SetRandomSeed(time(NULL));

	return ttd_main(argc, argv);
}

Clearly, in your psp.cpp (or whatever you call the PSP platform specific file you made), you need the same thing.