Unable to build against bullet double precision library

[rapsys]

Hi,

This follow up my trouble to get vdrift and stuntrally to build with a double precision bullet library.

Here is the patch that fixes it:
https://svnweb.mageia.org/packages/cauldron/vdrift/current/SOURCES/vdrift-2014-10-20-bullet-double.patch?revision=1919674&view=markup

Best regards

[gaoDean]

Hello there, I am not a maintainer or anything, but I just wanted to ask you if there were any noticeable benefits to using double precision bullet, (like when playing) as well as how to build with double precision?

[rapsys]

The main reason was that openmw require bullet library with double precision, there was collision issue that they fixed that way.
I just patched stuntrally, vdrift and irrlamb to only need on single common library.

I think you will learn more with the openmw pull request:
OpenMW/openmw#2049

[gaoDean]

Hello again, thanks for the information, but when I try to build (with your changes) it gives me this error (with bullet from homebrew and -DBT_USE_DOUBLE_PRECISION in my SConstruct):

src/dynamicsdraw.cpp:47:20: error: non-constant-expression cannot be narrowed from type 'btScalar' (aka 'double') to 'float' in initializer list [-Wc++11-narrowing]
        float verts[6] = {from.x(), from.y(), from.z(), to.x(), to.y(), to.z()};
                          ^~~~~~~~
src/dynamicsdraw.cpp:47:20: note: insert an explicit cast to silence this issue
        float verts[6] = {from.x(), from.y(), from.z(), to.x(), to.y(), to.z()};
                          ^~~~~~~~
                          static_cast<float>( )

Am I supposed to have this error, or am I using a wrong version of bullet or smth.

Thanks again

[gaoDean]

Also, when I do the casts and it compiles, it gives these linker errors:

Undefined symbols for architecture x86_64:
  "btRigidBody::setMassProps(double, btVector3 const&)", referenced from:
      FractureBody::FractureBody(FractureBodyInfo const&) in fracturebody.o
  "btRigidBody::predictIntegratedTransform(double, btTransform&)", referenced from:
      CarDynamics::updateAction(btCollisionWorld*, double) in cardynamics.o
  "btCapsuleShape::btCapsuleShape(double, double)", referenced from:
      LoadCapsuleShape(PTree const&, btTransform const&, btCollisionShape*&, btCompoundShape*&) in loadcollisionshape.o
  "btCapsuleShapeX::btCapsuleShapeX(double, double)", referenced from:
      LoadCapsuleShape(PTree const&, btTransform const&, btCollisionShape*&, btCompoundShape*&) in loadcollisionshape.o
  "btCapsuleShapeZ::btCapsuleShapeZ(double, double)", referenced from:
      LoadCapsuleShape(PTree const&, btTransform const&, btCollisionShape*&, btCompoundShape*&) in loadcollisionshape.o
  "btConvexHullShape::btConvexHullShape(double const*, int, int)", referenced from:
      LoadHullShape(PTree const&, btTransform const&, btCollisionShape*&, btCompoundShape*&) in loadcollisionshape.o
  "btMultiSphereShape::btMultiSphereShape(btVector3 const*, double const*, int)", referenced from:
      LoadHullShape(PTree const&, btTransform const&, btCollisionShape*&, btCompoundShape*&) in loadcollisionshape.o
  "btStaticPlaneShape::btStaticPlaneShape(btVector3 const&, double)", referenced from:
      PerformanceTesting::Test(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, ContentManager&, std::__1::basic_ostream<char, std::__1::char_traits<char> >&, std::__1::basic_ostream<char, std::__1::char_traits<char> >&) in performance_testing.o
  "btDiscreteDynamicsWorld::updateActions(double)", referenced from:
      btDiscreteDynamicsWorld::updateVehicles(double) in dynamicsworld.o
  "btDiscreteDynamicsWorld::stepSimulation(double, int, double)", referenced from:
      vtable for DynamicsWorld in dynamicsworld.o
  "btDiscreteDynamicsWorld::saveKinematicState(double)", referenced from:
      vtable for DynamicsWorld in dynamicsworld.o
  "btDiscreteDynamicsWorld::integrateTransforms(double)", referenced from:
      vtable for DynamicsWorld in dynamicsworld.o
  "btDiscreteDynamicsWorld::updateActivationState(double)", referenced from:
      vtable for DynamicsWorld in dynamicsworld.o
  "btDiscreteDynamicsWorld::createPredictiveContacts(double)", referenced from:
      vtable for DynamicsWorld in dynamicsworld.o
  "btDiscreteDynamicsWorld::predictUnconstraintMotion(double)", referenced from:
      vtable for DynamicsWorld in dynamicsworld.o
  "btDiscreteDynamicsWorld::internalSingleStepSimulation(double)", referenced from:
      vtable for DynamicsWorld in dynamicsworld.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
scons: *** [build/vdrift.app/Contents/MacOS/vdrift] Error 1
scons: building terminated because of errors.
make: *** [ALL] Error 2

commit here

[rapsys]

When I say logs, I mean FULL LOGS, even the last failing build commands :)

From what I see you builded against a double precision bullet, but at linking step you seems to miss a -lBulletWorldImporter or somthing in the linking command.

You may require this patch and rebuild your bullet library with it to have the library exported in the cmake config file:
https://svnweb.mageia.org/packages/cauldron/bullet/current/SOURCES/bullet-3.24-fix-bullet-config.cmake.patch?revision=1919697&view=markup

It's strange, seeing the log I required this patch only for stuntrally, not for vdrift...

Or did I do vdrift after stuntrally and didn't encounter the problem, dunno ?