lib names in Linux

Im trying to compile the demos in Linux via scons, but I have found a problem: no matter what I do I get an error about library not found. this is my scons config:

env.Append(CPPFLAGS='-Llib')
env.Append(CPPPATH = ['../include', '../../include','../../../Dynamics/include', '../../../Collisions/include', '/home/roger/projects/ogre/Samples/Common/include/'])
env.Append(LIBS = ['OgreBulletDyn', 'OgreBulletCol'])

I have copied the libs to all possible places, including the demo directory, but the error persists. Any idea about whats happening here?

You probably need to specify some additional variables for SCons such as:

env.Append ( LIBPATH=...
env.Append(RPATH=...

http://www.scons.org/doc/0.93/HTML/scons-user/x275.html

No, that didnt solved the problem.

No, that didnt solved the problem.
Without seeing your SConstruct file I wouldn't know what your problem is.

It's been some time since I built the demo but you could try updating the autotools build (see attached for an example may or may not still work).

Also I have some CMake build files (unfinished) for Linux/cross-compiling with Mingw I'll try and dig out if you want to go that route.

If someone can pull together a working linux build system I'll make sure it gets into SVN.

-Fish

Sorry, here is it:

env = Environment()
env.Append(CPPFLAGS='-Llib')
env.Append(CPPPATH = ['../include', '../../include','../../../Dynamics/include', '../../../Collisions/include', '/home/roger/projects/ogre/Samples/Common/include/'])
env.Append(LIBPATH=['lib'])
env.Append(RPATH=['lib'])
env.Append(LIBS = ['OgreBulletDyn', 'OgreBulletCol'])

def CheckPKGConfig(context, version):
context.Message( 'Checking for pkg-config... ' )
ret = context.TryAction('pkg-config --atleast-pkgconfig-version=%s' % version)[0]
context.Result( ret )
return ret

def CheckPKG(context, name):
context.Message( 'Checking for %s... ' % name )
ret = context.TryAction('pkg-config --exists \'%s\'' % name)[0]
context.Result( ret )
return ret

conf = Configure(env, custom_tests = { 'CheckPKGConfig' : CheckPKGConfig,
'CheckPKG' : CheckPKG })

if not conf.CheckPKGConfig('0.15.0'):
print 'pkg-config >= 0.15.0 not found.'
Exit(1)

if not conf.CheckPKG('OGRE >= 1.4.0'):
print 'Ogre3d >= 1.4.0 not found.'
Exit(1)

if not conf.CheckPKG('OIS >= 1.0'):
print 'OIS >= 1.0 not found.'
Exit(1)

if not conf.CheckPKG('bullet'):
print 'Bullet physics library not found.'
Exit(1)

env = conf.Finish()
env.ParseConfig('pkg-config --cflags --libs OGRE')
env.ParseConfig('pkg-config --cflags --libs OIS')
env.ParseConfig('pkg-config --cflags --libs bullet')

env.Program('demos',Split('''main.cpp Constraints_Demo.cpp Primitives_Demo.cpp
Ragdoll_Demo.cpp Terrain_Demo.cpp TriMesh_Demo.cpp Vehicle_Demo.cpp ../../src/OgreBulletListener.cpp
../../src/OgreBulletInputListener.cpp ../../src/OgreBulletGuiListener.cpp ../../src/OgreBulletApplication.cpp ../../src/BetaGUI.cpp'''))

I placed it in Demos/Dynamics_Demos/src

Tested the patch (applied with patch >demobuild.oath, dont know it was the wrong way) and besides a couple of errors:
patching file configure.ac
patching file Makefile.am
patching file Makefile.am
Hunk #1 FAILED at 1.
1 out of 1 hunk FAILED -- saving rejects to file Makefile.am.rej
patching file autogen.sh
patching file Makefile.am
Hunk #1 FAILED at 33.
1 out of 1 hunk FAILED -- saving rejects to file Makefile.am.rej

just says that needs a Makefile.in in Demos. And Im pretty sure that it will require a lot of Makefile.in, one for each directory.

Don't know why the patch failed, maybe I screwed up or something changed in OgreBullet since the last time I updated. I'll try a fresh check out later and create a new patch.

Regarding your SCons problem, where have you installed the OgreBullet libraries? If you are building the demo from your build dir the libraries are in '../../../Dynamics/src/.libs' and '../../../Collisions/src/.libs'. You probably need to update your SConstruct file with something like:


env.Append(LIBPATH=['../../../Dynamics/src/.libs','../../../Collisions/src/.libs'])

###env.Append(RPATH=['/media/sda7/Libraries/OGRE/ogre-svn/sdk/v1-7/lib','../../../Dynamics/src/.libs','../../../Collisions/src/.libs'])

## relative path http://www.scons.org/wiki/UsingOrigin
env.Append( RPATH = [ '/media/sda7/Libraries/OGRE/ogre-svn/sdk/v1-7/lib',
env.Literal('\\$$ORIGIN/../../../Dynamics/src/.libs'),
env.Literal('\\$$ORIGIN/../../../Collisions/src/.libs') ] )


Hmm, that was the problem, wrong path. It solved the missing lib but got a new error:

/home/roger/projects/ogrebullet/Collisions/src/.libs/libOgreBulletCol.so: undefined reference to `ConvexBuilder::~ConvexBuilder()'
/home/roger/projects/ogrebullet/Collisions/src/.libs/libOgreBulletCol.so: undefined reference to `ConvexBuilder::process(ConvexDecomposition::DecompDesc const&)'
/home/roger/projects/ogrebullet/Collisions/src/.libs/libOgreBulletCol.so: undefined reference to `ConvexBuilder::ConvexBuilder(ConvexDecomposition::ConvexDecompInterface*)'
collect2: ld returned 1 exit status

You need to link against libConvexDecomposition.

- From the CMake gui for bullet enable BUILD_EXTRAS and build.
- Manually copy across bullet-2.76/Extras/ConvexDecomposition/libConvexDecomposition.so(or .a) to where you have installed the bullet libs.
- run sudo ldconfig (if installed stadard location)
- For the OgreBulletCol lib link against libConvexDecomposition (see above patch) and point to the headers path, e.g:

CXXFLAGS='-I/media/sda7/Libraries/Physics/bullet-2.76/Extras/ConvexDecomposition' ./configure ......

- and link your demo against libConvexDecomposition (-lConvexDecomposition)


Again the same missing lib problem. this time is convexDecomposition:

g++ -o demos -pthread main.o Constraints_Demo.o Primitives_Demo.o Ragdoll_Demo.o Terrain_Demo.o TriMesh_Demo.o Vehicle_Demo.o /home/roger/projects/ogrebullet/Demos/src/OgreBulletListener.o /home/roger/projects/ogrebullet/Demos/src/OgreBulletInputListener.o /home/roger/projects/ogrebullet/Demos/src/OgreBulletGuiListener.o /home/roger/projects/ogrebullet/Demos/src/OgreBulletApplication.o /home/roger/projects/ogrebullet/Demos/src/BetaGUI.o -L/home/roger/projects/ogrebullet/Dynamics/src/.libs -L/home/roger/projects/ogrebullet/Collisions/src/.libs -L/usr/lib -lOgreBulletDyn -lOgreBulletCol -lConvexDecomposition -lOgreMain -lpthread -lOIS -lBulletDynamics -lBulletCollision -lLinearMath -lBulletSoftBody
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.4/../../../../x86_64-pc-linux-gnu/bin/ld: cannot find -lConvexDecomposition


ConvexDecomposition is part of the Bullet distribution. I don't believe it is built by default. The source is located in Bullet/Extras/ConvexDecomposition. If you use cmake to generate your Bullet build files you need to check the "BUILD_EXTRAS" option.

- Fish

Yes, I compiled it and copied Extras/libconvexdecomposition.a to /usr/lib, the ran ldconfig. But anyway, it doesnt works.