[reSIProcate] Make system problem

[Derek MacDonald]

I hit a fairly heinous makefile issue recently.  If you have CXXFLAGS or
CFLAGS set as an environment variable, the cxxflags in the obj.debug...
directory is rebuilt every compile, which causes a complete rebuild of all
files.

The issue is most likely in makefile.post:

ifeq ($(CXXFLAGS),$(shell test -f $(OBJ)/cxxflags && cat $(OBJ)/cxxflags))
else
.PHONY: $(OBJ)/cxxflags
endif

I don't speak make so I don't know how to fix it...is $CXXFLAGS colliding
with the bash environment variable?

Also, the repro executable always rebuilds.  There doesn't seem to be
dependency generation for TARGET_BINARY.  Does it just need the same rule
for dependency generation that TESTPROGRAM has in  Makefile.post?

-Derek
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