GP2X Using Devkitgp2x In The Wiz

[Franxis]

I have succesfully used DevKitGp2X to compile MAME4ALL on the Wiz.

But you have to modify two files to be able to link dinamically the libm and libpthread libraries.

C:\devkitGP2X\sysroot\usr\lib\libm.so:
CODE

/* GNU ld script
Use the shared library, but some functions are only in
the static library, so try that secondarily. */
OUTPUT_FORMAT(elf32-littlearm)
GROUP ( /lib/libm.so.6 )



C:\devkitGP2X\sysroot\usr\lib\libpthread.so:
CODE

/* GNU ld script
Use the shared library, but some functions are only in
the static library, so try that secondarily. */
OUTPUT_FORMAT(elf32-littlearm)
GROUP ( /lib/libpthread.so.0 )



Also you have to compile with the following flags: -mcpu=arm926ej-s -mtune=arm926ej-s

And link WITHOUT the -static flag.

That's all.

Regards.

 

[pea]

Fantastic! Thanks for sharing

 

[rlyeh]

Yeah very informative. Thanks franxis!

 

[Franxis]

Yeah, thanks master Rlyeh!

 

[slaanesh]

Great!

@ Franxis
When did you get your Wiz? Assuming it's not a retail version as they are not due until March?

 

[Exophase]

For what it's worth, I've been linking statically with libpthread and libm for GP2X (using Open2x compiler/environment) and I haven't had any problems so far. This might not be a great idea.

I've always wondered, is it possible to statically link only some libraries and dynamically link others? Maybe someone could tell me how to do this with gcc.

 

[Orkie]

I've always wondered, is it possible to statically link only some libraries and dynamically link others? Maybe someone could tell me how to do this with gcc.

Yes, look up -Bstatic and -Bdynamic. There is some information here. I don't know if that link is actually about gcc, but I do know it works the same way.

 

[Exophase]

I've always wondered, is it possible to statically link only some libraries and dynamically link others? Maybe someone could tell me how to do this with gcc.

Yes, look up -Bstatic and -Bdynamic. There is some information here. I don't know if that link is actually about gcc, but I do know it works the same way.


Thanks. It looks like you have to pass the option to the linker with -Wl,-Bstatic ... -Wl,-Bdynamic

 

[satacoy]

I realize this is an old thread, but I don't quite understand part of the original discussion:

I can certainly find the libm.so file in the specified location, but then I'm a bit confused about what to do with the code snippet above. Originally I thought they were directions on how to modify the libm.so file, but I see that it's a large binary file. Should I be running the linker against the .so file somehow, using the above code snippet as arguments? Should I be placing that code into a specially named file in the same location?

 

[Franxis]

GROUP ( /lib/libm.so.6 "]

I can certainly find the libm.so file in the specified location, but then I'm a bit confused about what to do with the code snippet above. Originally I thought they were directions on how to modify the libm.so file, but I see that it's a large binary file. Should I be running the linker against the .so file somehow, using the above code snippet as arguments? Should I be placing that code into a specially named file in the same location?[/quote]Delete the old file and create a new ASCII file with the content i have pasted.

 

[satacoy]

Delete the old file and create a new ASCII file with the content i have pasted.

A ha! Thanks!

 

[Eclipse]

Hi

thanks Franxis, I've tried what you suggested using a Guyfawkes SDL test program (just the init and a screen present with a text) and it indeed compile but hangs up when launched on the wiz with the GPH loading screen.

Is there a method i can use to debug it? like using the usb cable maybe or a text log maybe?

I'm using Octoate's DevkitGP2x toolchain (2006-03-06) with Guyfawke's SDL Libs (2006-10-21)...

Basically i did what it's on this old tutorial http://wiki.gp2x.org/wiki/Using_CodeBlocks plus your changes, what you suggest? Thanks...

edit: i've tried with a simpler SDL program, still nothing, i'm linking with -lz -lmad -lSDL -lgcc -lm -lc -lexpat -lpthread -msoft-float
and compiling with -mcpu=arm926ej-s -mtune=arm926ej-s


edit2: solved linking only with -lSDL, still i don't know what the Wiz miss and what libraries it has... i'm still new to linux and i don't know how to check what i can use dinamically and what i'll miss...

 

[mhadf]

I'm have a similar problem.

I've followed the instructions from here. And figured to try the GuyFawkes demo first.

However I'm getting a fatal error when compiling.

I've removed the -static from the link in the makefile and have tried leaving it blank AND replacing it with -mcpu=arm926ej-s -mtune=arm926ej-s.

This is what I'm getting

C:\devkitGP2X\demo\guyfawkes>make
C:/devkitGP2X/bin/arm-linux-g++ -mcpu=arm926ej-s -mtune=arm926ej-s -o sdltest.gp
e sdltest.o -L"C:/devkitGP2X/lib" -lSDL -lSDL_gfx --start-group -lSDL_ttf -lfree
type -lSDL --end-group -lSDL_image -ljpeg -lpng12 -lz --start-group -lSDL_mixer
-lvorbisidec -lmikmod -lsmpeg -lSDL --end-group -lgcc -lm -lc -lexpat -lpthread
-ldl
c:\devkitgp2x\bin\..\lib\gcc\arm-linux\4.0.2\..\..\..\..\arm-linux\bin\ld.exe: c
annot find /usr/lib/ inside c:\devkitgp2x\arm-linux\bin\../../sysroot
make: *** [sdltest.gpe] Error 1

any idea where I might be going wrong?