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Dynamic loading support requires that executables be linked with -ldld.
The alternative is to build the collector without defining DYNAMIC_LOADING
in gcconfig.h and ensuring that all garbage collectable objects are
accessible without considering statically allocated variables in dynamic
libraries.

The collector should compile with either plain cc or cc -Ae.  CC -Aa
fails to define _HPUX_SOURCE and thus will not configure the collector
correctly.

Incremental collection support was reccently added, and should now work.

Thread support for HP/UX 11 Pthreads was also recently added.  It is still
flakey in this release.  (It has only been tested on a uniprocessor.  Even
there some fraction of thread creation calls fail with a not-yet-understood
error return from sem_wait.)