[Gm2] Building gm2-4.7.3 on MacOS 10.5.8/PPC

[john o goyo]

In the interests of portability, I tried building gm2 on my DP G5 
(PPC970) running Mac 10.5.8.  I am able to build gcc-4.7.3 but ran into 
problems with gm2.  In summary, LDFLAGS is not being propopaged down to 
the gm2 level.  Summary of the journey follows.

Following recommendations found on the web, I used gcc-4.2 that comes 
with Xcode.  (With gmp, mpfr, and mpc, make check passed all test.)

Building gmp-5.0.5:
    CC=gcc-4.2 CFLAGS='-m64 -mtune=970 -O3' \
    CXX=g++-4.2 CXXFLAGS='-m64 -mtune=970 -O3' \
    ./configure

Building mpfr-3.1.1:
    CC=gcc-4.2 CFLAGS='-m64 -mtune=970 -O3' \
    CXX=g++-4.2 CXXFLAGS='-m64 -mtune=970 -O3' \
    ./configure --with-gmp=/usr/local

Building mpc-1.0.1:
    CC=gcc-4.2 CFLAGS='-m64 -mtune=970 -O3' \
    CXX=g++-4.2 CXXFLAGS='-m64 -mtune=970 -O3' \
    ./configure --with-gmp=/usr/local --with-mpfr=/usr/local

Building gcc-4.7.3:
    CC=gcc-4.2 CFLAGS='-m64 -mtune=970 -O3' \
    CXX=g++-4.2 CXXFLAGS='-m64 -mtune=970 -O3' \
    $(SRCDIR)/gcc-4.7.3/configure \
    --prefix=$HOME/gcc-4.7.3 --exec-prefix=$HOME/gcc-4.7.3 \
    --with-mpc=/usr/local \
    --with-mpfr=/usr/local \
    --with-gmp=/usr/local \
    --enable-languages=c,c++ \
    --disable-multilib \
    --disable-bootstrap --enable-checking --disable-libitm

So far, so good.  Tried building gm2 with the following configuration 
options:

CC=gcc-4.2 CFLAGS='-m64 -mtune=970 -O3' \
CXX=g++-4.2 CXXFLAGS='-m64 -mtune=970 -O3' \
LDFLAGS='-m64 -mtune=970' \
../../src/gcc-4.7.3-patched/configure \
--prefix=$HOME/gm2-4.7.3 --exec-prefix=$HOME/gm2-4.7.3 \
--with-mpc=/usr/local \
--with-mpfr=/usr/local \
--with-gmp=/usr/local \
--enable-languages=c,c++,gm2 \
--disable-multilib \
--disable-bootstrap --enable-checking --disable-libitm \
--enable-libgm2

Failure here:

gcc-4.2  gm2/boot-bin/trans.o gm2/boot-bin/stuff.o gm2/boot-bin/out.o 
gm2/boot-bin/comment.o gm2/boot-bin/lex.o gm2/boot-bin/parse.o 
gm2/boot-bin/decl.o gm2/boot-bin/expr.o gm2/boot-bin/pexpr.o 
gm2/boot-bin/funcs.o gm2/boot-bin/dir.o -o gm2/boot-bin/p2c
ld warning: in gm2/boot-bin/trans.o, file is not of required  architecture
ld warning: in gm2/boot-bin/stuff.o, file is not of required architecture
[...]

Note that LDFLAGS are not used.  I tried linking the above by hand with 
those flags and it linked without problems.

So, how do I push LDFLAGS to the gm2 part?

Sincerely,
john