[boost] Issue building boost libs 1_35_0 on sparcv8 arch. with gcc 4.0.2

From: Bhat, Aniket (Aniket.Bhat_at_[hidden])
Date: 2008-08-15 11:06:47

FYI,

I ran across a problem with the boost inline assembly code in
boost_1_35_0/boost/detail/sp_counted_base_gcc_sparc.hpp. This file has
inline assembly which uses the "cas" instruction. 

    __asm__ __volatile__( "cas %0, %2, %1"
                        : "+m" (*dest_), "+r" (swap_)
                        : "r" (compare_)
                        : "memory" );

Sparcv8 and pre-v8 architectures seem to be using the "swap" instruction
instead. The native sparcv8 assembler therefore complains on trying to
parse this: 

gcc.compile.c++
/home/cmchan/boost_libs/boost/bin.v2/libs/date_time/build/gcc-4.0.2/debu
g/threading-multi/greg_month.o
/var/tmp//ccMoGlpR.s: Assembler messages:
/var/tmp//ccMoGlpR.s:1936: Error: Architecture mismatch on "cas".
/var/tmp//ccMoGlpR.s:1936: (Requires v9|v9a|v9b; requested architecture
is v8.)

The file mentioned above is new in boost_1_35_0 and is included from
boost_1_35_0/boost/detail/sp_counted_base.hpp: 

#elif defined(__GNUC__) && ( defined( __sparcv8 ) || defined( __sparcv9
) )

Simply removing the pre-processing for __sparcv8 fixes the issue. I am
not sure if this is really a tool-chain issue or the problem with the
header boost_1_35_0/boost/detail/sp_counted_base.hpp

Thanks,
Aniket.

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