[Boost-users] [boost::any] Newbie Question About Compiler Warning on HPUX with boost::any

From: Richard Ward (richard_ward_at_[hidden])
Date: 2006-04-28 10:40:47

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.