Can't build OpenMW with bullet built from git with double precision and multithreading

[heilkitty]

ld throws the following error for every executable:

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/usr/bin/ld: cannot find -lBulletCollision-float64
/usr/bin/ld: cannot find -lLinearMath-float64
collect2: error: ld returned 1 exit status
make[2]: *** [apps/openmw/CMakeFiles/openmw.dir/build.make:4502: openmw] Error 1
make[1]: *** [CMakeFiles/Makefile2:881: apps/openmw/CMakeFiles/openmw.dir/all] Error 2
make: *** [Makefile:130: all] Error 2

I'm pretty sure, it's because of bullet.
Ubuntu 20.04.
OpenMW@68ddde84fe77ec2c51098f61933d66d3d1c009a7 :

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$ cmake -LA | grep -i bullet
CMake Warning:
  No source or binary directory provided.  Both will be assumed to be the
  same as the current working directory, but note that this warning will
  become a fatal error in future CMake releases.


CMake Error: The source directory "/home/heilkitty/soft/openmw/build" does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.
BULLET_COLLISION_LIBRARY:FILEPATH=/usr/local/lib/libBulletCollision.so
BULLET_COLLISION_LIBRARY_DEBUG:FILEPATH=BULLET_COLLISION_LIBRARY_DEBUG-NOTFOUND
BULLET_DYNAMICS_LIBRARY:FILEPATH=/usr/local/lib/libBulletDynamics.so
BULLET_DYNAMICS_LIBRARY_DEBUG:FILEPATH=BULLET_DYNAMICS_LIBRARY_DEBUG-NOTFOUND
BULLET_INCLUDE_DIR:PATH=/usr/local/include/bullet
BULLET_MATH_LIBRARY:FILEPATH=/usr/local/lib/libLinearMath.so
BULLET_MATH_LIBRARY_DEBUG:FILEPATH=BULLET_MATH_LIBRARY_DEBUG-NOTFOUND
BULLET_SOFTBODY_LIBRARY:FILEPATH=/usr/local/lib/libBulletSoftBody.so
BULLET_SOFTBODY_LIBRARY_DEBUG:FILEPATH=BULLET_SOFTBODY_LIBRARY_DEBUG-NOTFOUND
BULLET_STATIC:BOOL=OFF
BULLET_USE_DOUBLES:BOOL=TRUE
OPENMW_USE_SYSTEM_BULLET:BOOL=ON

bullet@00cd39dc500dfe26818aaaae8db0ed5ac6a50fa2 :

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$ cmake -LA | grep -i -e "thread" -e "double"
CMake Warning:
  No source or binary directory provided.  Both will be assumed to be the
  same as the current working directory, but note that this warning will
  become a fatal error in future CMake releases.


CMake Error: The source directory "/home/heilkitty/soft/bullet3/build_cmake" does not appear to contain CMakeLists.txt.
Specify --help for usage, or press the help button on the CMake GUI.
BULLET2_MULTITHREADING:BOOL=ON
BULLET2_USE_OPEN_MP_MULTITHREADING:BOOL=OFF
BULLET2_USE_TBB_MULTITHREADING:BOOL=OFF
USE_DOUBLE_PRECISION:BOOL=ON

[psi29a]

If you're running Ubuntu 20.04, then you should have bullet installed with these files:

https://packages.ubuntu.com/focal/amd64 ... 8/filelist

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/usr/lib/x86_64-linux-gnu/libBullet3Collision-float64.so.2.88
/usr/lib/x86_64-linux-gnu/libBullet3Collision.so.2.88
/usr/lib/x86_64-linux-gnu/libBullet3Common-float64.so.2.88
/usr/lib/x86_64-linux-gnu/libBullet3Common.so.2.88
/usr/lib/x86_64-linux-gnu/libBullet3Dynamics-float64.so.2.88
/usr/lib/x86_64-linux-gnu/libBullet3Dynamics.so.2.88
/usr/lib/x86_64-linux-gnu/libBullet3Geometry-float64.so.2.88
/usr/lib/x86_64-linux-gnu/libBullet3Geometry.so.2.88
/usr/lib/x86_64-linux-gnu/libBullet3OpenCL_clew-float64.so.2.88
/usr/lib/x86_64-linux-gnu/libBullet3OpenCL_clew.so.2.88
/usr/lib/x86_64-linux-gnu/libBulletCollision-float64.so.2.88
/usr/lib/x86_64-linux-gnu/libBulletCollision.so.2.88
/usr/lib/x86_64-linux-gnu/libBulletDynamics-float64.so.2.88
/usr/lib/x86_64-linux-gnu/libBulletDynamics.so.2.88
/usr/lib/x86_64-linux-gnu/libBulletSoftBody-float64.so.2.88
/usr/lib/x86_64-linux-gnu/libBulletSoftBody.so.2.88
/usr/lib/x86_64-linux-gnu/libLinearMath-float64.so.2.88
/usr/lib/x86_64-linux-gnu/libLinearMath.so.2.88
/usr/share/doc/libbullet2.88/changelog.Debian.gz
/usr/share/doc/libbullet2.88/copyright
/usr/share/lintian/overrides/libbullet2.88

The fact that it can't be found on your system, indicates that you're not using standard bullet libraries.

Double precision comes out of the box by Ubuntu. However your title is misleading... it looks like you are trying to enable multithreading. In that case, you'll need to modify your libraries to prepend float64 to them, like above, to follow the Debian and Ubuntu way of doing things so that single precision and double precision can live side by side.

[heilkitty]

Changed the title in order to avoid further confusion.
Do you mean applying 0003-If-building-with-double-precision-namespace-all-libr.patch and 0004-CMake-definitions-use-the-namespaced-library-names.patch ?

[psi29a]

I believe those are it, yes.

[heilkitty]

Thanks, I'll try it.