During shared library loading, a different libLLVM can be pulled in, causing
llvm symbols from dependent libraries to resolve to that library instead of
this one. This has been seen in the wild with the Mesa OpenGL implementation
in JavaFX applications (see wpilibsuite/shuffleboard#361).
This is clearly a very breaking change. For some level of backwards
compatibility, a namespace alias from llvm to wpi is performed in the "llvm"
headers. Unfortunately, forward declarations of llvm classes will still break,
but compilers seem to generate clear error messages in those cases
("namespace alias 'llvm' not allowed here, assuming 'wpi'").
This change also moves all the wpiutil headers to a single "wpi" subdirectory
from the previously split "llvm", "support", "tcpsockets", and "udpsockets".
Shim headers will be added for backwards compatibility in a later commit.
* Modify halsim to be able to load extension libraries if they are available.
It will read the list of libraries to try from the HALSIM_EXTENSIONS
environment variable. Multiple libraries can be given if separated
by ';' (Windows) or ':' (Unix).
The library must have an 'HALSIM_InitExtension' method that returns >= 0 on success.
The library is expected to use the interface expressed by
hal/src/src/main/native/include/MockData
* Add a simple halsim library that just prints robot values.
This makes a good test bed for cross platform purposes,
and provides the ultimate in light weight simulators.
This initial version only prints PWM values.
