While doing some pathscale compiler testing on the trunk (r17407), I  
ran into this compile problem (the first is a warning, the second is  
an error):

pathCC -DHAVE_CONFIG_H -I. -I../.. -I../../extlib/otf/otflib -I../../ 
extlib/otf/otflib -I../../vtlib/ -I../../vtlib   -openmp -DVT_OMP -g - 
Wall -Wundef -Wno-long-long -finline-functions -pthread -MT vtfilter- 
vt_tracefilter.o -MD -MP -MF .deps/vtfilter-vt_tracefilter.Tpo -c -o  
vtfilter-vt_tracefilter.o `test -f 'vt_tracefilter.cc' || echo  
'./'`vt_tracefilter.cc
mv -f .deps/vtfilter-vt_otfhandler.Tpo .deps/vtfilter-vt_otfhandler.Po
mv -f .deps/vtfilter-vt_filthandler.Tpo .deps/vtfilter-vt_filthandler.Po
"vt_tracefilter.cc", line 451: Warning: Referenced scalar variable  
_ZZ4mainE5retev is SHARED by default
"vt_tracefilter.cc", line 921: Warning: Referenced scalar variable  
_ZZ4mainE5retev is SHARED by default
"vt_tracefilter.cc", line 950: Warning: Referenced scalar variable  
_ZZ4mainE5retst is SHARED by default
"vt_tracefilter.cc", line 977: Warning: Referenced scalar variable  
_ZZ4mainE5retsn is SHARED by default
mv -f .deps/vtfilter-vt_filter.Tpo .deps/vtfilter-vt_filter.Po
mv -f .deps/vtfilter-vt_tracefilter.Tpo .deps/vtfilter-vt_tracefilter.Po
pathCC -openmp -DVT_OMP -g -Wall -Wundef -Wno-long-long -finline- 
functions -pthread -openmp  -o vtfilter vtfilter-vt_filter.o vtfilter- 
vt_filthandler.o vtfilter-vt_otfhandler.o vtfilter-vt_tracefilter.o - 
L../../extlib/otf/otflib -L../../extlib/otf/otflib/.libs -lotf  -lz - 
lnsl -lutil  -lm
vtfilter-vt_tracefilter.o(.text+0x309b): In function `main':
/home/jsquyres/svn/ompi2/ompi/contrib/vt/vt/tools/vtfilter/ 
vt_tracefilter.cc:794: undefined reference to  
`FiltHandlerArgument::FiltHandlerArgument(FiltHandlerArgument const&)'
vtfilter-vt_tracefilter.o(.text+0x312f):/home/jsquyres/svn/ompi2/ompi/ 
contrib/vt/vt/tools/vtfilter/vt_tracefilter.cc:802: undefined  
reference to  
`FiltHandlerArgument::FiltHandlerArgument(FiltHandlerArgument const&)'
vtfilter-vt_tracefilter.o(.text+0x577b): In function `__ompdo_main2':
/home/jsquyres/svn/ompi2/ompi/contrib/vt/vt/tools/vtfilter/ 
vt_tracefilter.cc:802: undefined reference to  
`FiltHandlerArgument::FiltHandlerArgument(FiltHandlerArgument const&)'
collect2: ld returned 1 exit status
make[6]: *** [vtfilter] Error 1
make[6]: Leaving directory `/home/jsquyres/svn/ompi2/ompi/contrib/vt/ 
vt/tools/vtfilter'

This is with the pathscale v3.0 compilers.