Incompatibility with GCC4 optimization

[Michael Sheldon]

Lib3DS is currently incompatible with GCC4's optimization features, causing all vertex data to be given the value 0. This can be fixed by compiling without optimization (use the CFLAG -O0).

[Trent Lloyd (lathiat)]

Thanks for the report michael, don't suppose you have some kind of test case for this?

[Michael Sheldon (michael-sheldon)]

Nothing convenient, I could write a little test program if you like?

[Trent Lloyd (lathiat)]

Yeh that would be nice, it only has to be basic, I'd just like to try a couple things and with more up to date GCC and that sort of thing :)

[Michael Sheldon (michael-sheldon)]

Sorry for the delay; you can grab the test program from: http://junk.mikeasoft.com/ubuntu-3dstest.tar.gz

The correct output should look like:
Expecting: 0.065576; Value returned by lib3ds: 0.065576

The output when compiled against the Ubuntu version of lib3ds is more along the lines of:
Expecting: 0.065576; Value returned by lib3ds: 4.04892e-34

Remember that since lib3ds is statically linked you'll need to recompile the test program after any changes you make to lib3ds for them to take effect.

Cheers,
 Mike.

[Trent Lloyd (lathiat)]

Fixed this with a patch snarfed off the lib3ds mailing list in the latest upload.

[Rahul Budhiraja (rahul-budhiraja-dark)]

Dear Trent,

Thanks for all the help.

I am using PTAMM and I had compiled it 2-3 weeks back and there was no issue .However now upon compiling I get the following errors:

Model3ds.o: In function `PTAMM::Model3DS::_GenerateDisplayList(Lib3dsFile*, bool)':
Model3ds.cc:(.text+0x510): undefined reference to `lib3ds_mesh_calculate_vertex_normals'
Model3ds.o: In function `PTAMM::Model3DS::_Load()':
Model3ds.cc:(.text+0xe88): undefined reference to `lib3ds_file_open'
collect2: ld returned 1 exit status
make: *** [PTAMM] Error 1

I came across ur forum and added the compile flags but still the problem persists ,I am really stumped because I am not able to get something 2 work which I had in the past ! .

Could u pls give me any suggestions which would help me

I downloaded the test file which u gave and I got the following output
Expecting: 0.065576; Value returned by lib3ds: 0.065576
If the values do not match try compiling lib3ds with the -O0 flag, or with a version of g++ prior to 4.0

which means things r fine ..

could u pls help me I would really appreciate it if you could give me ur valuable feedback

Kindest Regards
Rahul

[jcoates (jcoatz)]

Same problem.