CXX conversion: min g++ version pre-requisite?

[Gary Funck <gary at intrepid dot com>]

Paul Hargrove noted the following build failure on
an older x86-32 Linux (Redhat 8.0) system.

g++ -c   -g -O2 -DIN_GCC   -fno-exceptions -fno-rtti -W -Wall
-Wwrite-strings -Wcast-qual -Wmissing-format-attribute -fno-common
 -DHAVE_CONFIG_H -DGENERATOR_FILE -I. -Ibuild
-I/usr/local/pkg/upc/nightly/compiler/gupc-src/gcc
-I/usr/local/pkg/upc/nightly/compiler/gupc-src/gcc/build
-I/usr/local/pkg/upc/nightly/compiler/gupc-src/gcc/../include
-I/usr/local/pkg/upc/nightly/compiler/gupc-src/gcc/../libcpp/include
-I/usr/local/pkg/gmp-4.2.4/include -I/usr/local/pkg/mpfr-2.4.2/include
-I/usr/local/pkg/mpc-0.8/include
 -I/usr/local/pkg/upc/nightly/compiler/gupc-src/gcc/../libdecnumber
-I/usr/local/pkg/upc/nightly/compiler/gupc-src/gcc/../libdecnumber/bid
-I../libdecnumber    \
        -o build/genoutput.o
/usr/local/pkg/upc/nightly/compiler/gupc-src/gcc/genoutput.c
/usr/local/pkg/upc/nightly/compiler/gupc-src/gcc/genoutput.c: In function
`void note_constraint(rtx_def*, int)':
/usr/local/pkg/upc/nightly/compiler/gupc-src/gcc/genoutput.c:1178: error:
reinterpret_cast from type `const char (*)[1]' to type `char*' casts away
constness
make[2]: *** [build/genoutput.o] Error 1
make[2]: Leaving directory `/usr/local/pkg/upc/nightly/compiler/bld/gcc'
make[1]: *** [all-gcc] Error 2
make[1]: Leaving directory `/usr/local/pkg/upc/nightly/compiler/bld'
make: *** [all] Error 2


The g++ version is: g++ (GCC) 3.4.0

Currently, install.texi states:

    @heading Tools/packages necessary for building GCC
    @table @asis
    @item ISO C90 compiler
    Necessary to bootstrap GCC, although versions of GCC prior
    to 3.4 also allow bootstrapping with a traditional (K&R) C compiler.

    To build all languages in a cross-compiler or other configuration where
    3-stage bootstrap is not performed, you need to start with an existing
    GCC binary (version 2.95 or later) because source code for language
    frontends other than C might use GCC extensions.

This appears to be out-of-date with respect to new C++ stage 1
build requirement.

Please advise.

Thanks,
- Gary