Creating a PSP Library

71M · Post by **71M** » Mon Aug 01, 2005 6:39 am

Hi,
I'm having problems creating a lib file for the PSP.
The library compiles and creates a .a file, but when I try and link the lib into my project I get an 'undefined reference to...' error.

www.easy-monkey.co.uk/libtest.rar

Hope somebody can help me figure this one out.

Thanks,
71M

71M · Post by **71M** » Mon Aug 01, 2005 10:55 pm

Alternatively does anyone have an example of a simple library that works?
I've successfully compiled and linked in libpng and zlib, but can't see any differences between those library definitions and the ones I've created.

Cheers,
71M

rinco · Post by **rinco** » Mon Aug 01, 2005 11:32 pm

links fine for me... -L. -ltest
but i have to wonder why you've declared the function as external.

71M · Post by **71M** » Mon Aug 01, 2005 11:39 pm

rinco wrote:links fine for me... -L. -ltest
but i have to wonder why you've declared the function as external.

I've managed to find the problem.
I bet you're linking the lib into a C project. Trying to link it into a C++ project throws up the errors.
By changing the header to this -

Code: Select all

#ifdef __cplusplus
extern "C"
&#123;
#endif

int	TestFunction&#40;&#41;;

#ifdef __cplusplus
&#125;
#endif

It links correctly!
I shoulda guessed this one!!!
Thanks for all your help.

Cheers,
71M

elevationsnow · Post by **elevationsnow** » Mon Sep 12, 2005 1:57 am

could you tell me how you succefully installed libpng im using cygwin and it just doesnt want to install

liquid8d · Post by **liquid8d** » Tue Sep 13, 2005 2:16 pm

taken from this post:

http://forums.ps2dev.org/viewtopic.php? ... sc&start=0

----------------------
in your Cygwin Bash Shell (or whatever you use) enter the folowing lines;
svn co svn://svn.ps2dev.org/psp/trunk/zlib -- press [Enter] and wait for the prompt to show back up.
svn co svn://svn.ps2dev.org/psp/trunk/libpng -- press [Enter] and wait for the prompt to show back up.

[Edit] Those two lines up just above this look like links to websites, but they're not, so don't even bother clicking on them.

then you need to change your directory in the bash shell to your psptoolchain/zlib folder, and then type 'make' and then 'make install'
then change the directory over to your psptoolchain/libpng folder and type 'make' and 'make install' again.

You need to include png.h and you need to add the following to your makefile;

Code:
LIBS = -lpng -lz
----------------------------

LiQuiD8d