Hello,

I'm a new user to boost and have a question about a compiler warning I'm seeing.  I'm currently using just the boost::any type and on HPUX v11.00 PA with aCC: HP ANSI C++ B3910B A.03.56 I'm seeing the following warning:

Warning (anachronism) 823:
"/Components/dev/Boost/v1.33.1/boost/type_traits/is_reference.hpp", line 38
# Redundant preprocessing concatenation operation results in two valid preprocessing tokens. Depending on this implementation defined behavior will result in non-portable code.
BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_reference,T,false)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Here's the compile line that generated the warning:

aCC -AA -DACE_HAS_STANDARD_CPP_LIBRARY=1 -D_RWSTD_MULTI_THREAD -D_REENTRANT
-U_INCLUDE__STDC_A1_SOURCE -DACE_HAS_THREADS -D_POSIX_C_SOURCE=199506L -DHPUX_VERS=1100
-DACE_LACKS_PRAGMA_ONCE +W302 +W930 +W849 -mt +DAportable
+Z -D_LARGEFILE64_SOURCE=1
+O3 +Osize
-DACE_NDEBUG -DACE_USE_RCSID=0 -DACE_HAS_EXCEPTIONS -D__ACE_INLINE__ -D__UNIX
-c -o .objects/HP-UX.B.11.00_RISC_aCC.A.03.37/release//LicAgentSvc.o
LicAgentSvc.cpp

Because the boost::any header is included in one of my headers, I see this warning hundreds of times.  While I could just suppress it I prefer to first try to figure out what the issue is.  I dislike suppressing warnings I don't understand.

Does anyone know what this warning means and/or have any suggestions for what to do about it?

Thanks,

Richard J. Ward

Symantec Corp.