Parallel cl_load() crash (bb #2333).
Reason is twofold:
- cache.c had 2 'static' global variables, thus trying to initialize same cache
from multiple threads
- bytecode2llvm.cpp: something in LLVM 2.7 is crashing when loading in
parallel
Fix is to drop the 'static' on the variable (cache is per engine already).
This also fixes a potential memory leak in clamd!
The other part of the fix is to turn on the mutex around bytecode compilation
always. We don't call cl_load in parallel, so this doesn't affect clamd, but
some may need to call cl_load in parallel.
a7cf187a0c