Andrew Hughes reports:

In this HotSpot change:

changeset: 1932:f95d63e2154a
user: stefank
date: Tue Nov 23 13:22:55 2010 -0800
summary: 6989984: Use standard include model for Hospot

changes are made to how the files to compile are collated in the Makefiles.
Namely, this line is added:

+CORE_PATHS := $(shell find $(GAMMADIR)/src/share/vm/* -type d \! \(
-name adlc -o -name c1 -o -name gc_implementation -o -name opto -o
-name shark -o -name libadt \))

which filters various configuration-specific files out, when compiling
the list of core files to compile.

Sadly, the Shark files are then never added back in, so it never gets
built. Shark builds succeed but you don't get a Shark VM.

This change (arrived at by both myself and Gary Benson separately):

http://cr.openjdk.java.net/~gbenson/zero-shark-fixes-04-1/

fixes the issue by adding Shark back into the mix.