Compiling simple C++ code

C++ coding using Panda3D
1

Trying to compile and run the simple first example in the online manual on a Mac OS X (Snow Leopard).

I get the following output when I build:

Linked console executable: bin/debug/pandtemp
Undefined symbols:
“TypedObject::_type_handle”, referenced from:
TypedObject::get_class_type() in main.o
“PandaFramework::close_framework()”, referenced from:
_main in main.o
“TypedObject::~TypedObject()”, referenced from:
Socket_IP::~Socket_IP() in main.o
Socket_IP::~Socket_IP() in main.o
Socket_IP::~Socket_IP() in main.o
Socket_IP::~Socket_IP() in main.o
"Notify::assert_failure(char const*, int, char const*): referenced from:
BitMask<unsigned int, 32>::set_bit(int)in main.o

etc etc (I had to type that…how do I simply copy and paste all the output?)

at the end I get

ld: symbol(s) not found
collect2: ld returned 1 exit status

Can’t seem to run the example.

Any help would be appreciated?

Thanks

2

It seems like you forgot to link to one or more of Panda3D’s libraries. Which libraries did you link to? How did you compile it?

3

No quite sure (I don’t use Mac) but I believe it could have to do with the fact that you dont really have a “debug” version (if you don’t build one yourself) of Panda3D coming with the SDK.

Did you try build that in “release” mode ?

[EDIT]
ups didn’t see rdb had already answered :slight_smile:
[/EDIT]

4

I have included:
panda3d/includes
panda3d/lib
and the python header files of python2.5

I am not exactly sure what this means but I typed the following command

touch t.c; gcc -arch i386 t.c

it gives this:

Undefined symbols:
“_main”, referenced from:
start in crt1.10.6.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

Thanks for any help.

I just try to build while working in Code Blocks. Still learning about different settings so I might have some wrong settings…using default values at this point.

5

These commands:

touch t.c
gcc -arch i386 t.c

First you create an empty t.c file, and then you try to compile it. But the linker errors because you don’t have a main function - of course, because it’s empty.

But I don’t see how this is related to anything. You just need to set the appropriate linker definitions, so that your compiler links against the Panda3D libraries.

6

I finally got the linker settings correct…I think. I was putting the search folders in the compiler section that needed to be put in the linker settings.

Now I only get warnings related to 64 bit architecture…

warning: option -s is obsolete and being ignored
warning: in /Developer/Panda/lib/libp3framework.dylib, missing required architecture x86_64 in file

and several more of the exact same warning but related to different dylib files.

Not sure exactly how to address this…

Any ideas?

Thanks again.

7

You should only compile for i386, not for x86_64.

8

Ok… I added the flag -march=i386 so here are the full compiler and linker options for code blocks

<Compiler>
		<Add option="-march=i386" />
		<Add option="-O2" />
		<Add option="-O" />
		<Add option="-Wall" />
		<Add option="-fexceptions" />
		<Add option="-fPIC" />
		<Add directory="/Developer/Panda3D/include" />
		<Add directory="/Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/Python.framework/Versions/2.5/include/python2.5" />
	</Compiler>
	<Linker>
		<Add option="-fPIC" />
		<Add option="-lp3framework" />
		<Add option="-lpanda" />
		<Add option="-lpandafx" />
		<Add option="-lpandaexpress" />
		<Add option="-lp3dtoolconfig" />
		<Add option="-lp3dtool" />
		<Add option="-lp3pystub" />
		<Add option="-lp3direct" />
		<Add directory="/Developer/Panda3D/lib" />

I get the following error. Maybe it is a code blocks error?

error: CPU you selected does not support x86-64 instruction set.

I though that specifying -march=-i386 would preclude this error.

hmmmm

Thanks for any thoughts

9

That’d be “-arch i386”. If that’s not it, Code::Blocks may be adding flags itself. Maybe it’s some kind of ‘universal binaries’ option?

10

That seems like it must be it although I can’t seem to find any settings specified in the settings pull down menu that I think is the global settings.

I tried to switch to XCode to see if I could get it to compile there.

Put in the same settings and get the following error:

Directory ‘/Development/panda3d/lib’ following the -L not found
Library not found for -lp3direct

hmmmm…

The only path I have for the libaries is:
/Develpment/panda3d/lib

am I missing one??
that is the only lib folder I have listed in code blocks.

Macs are pretty difficult :slight_smile: perhaps I should go back to PC

Thanks for any suggestions.

11

I think it’s /Developer, not /Development or /Develpment.

12

Thanks for all the feedback.

It works and now I can start to see if I can code something useful :slight_smile: