Problem building 64-bit gm2 on Solaris 11.3/sparc

[john o goyo]

Greetings, Gaius.

I tried building a 64-bit version of gm2 (ABI=64, CFLAGS=-m64, and 
sparcv9).  The C/C++ bits build fine without m2 but the -m64 does not 
seem to propagate down to building mc.  The stuff in m2/mc-boot was 
compiled to 32 bits.

/home/build/gcc/git/bin/g++ -c -DIN_GCC -m64 [...] -o m2/boot-bin/mc
[...]
ld: fatal: file m2/mc-boot/GASCII.o: wrong ELF class: ELFCLASS32
ld: fatal: file m2/mc-boot/GArgs.o: wrong ELF class: ELFCLASS32
[...]

If you could tell me where these are compiled, I could manually adding 
the 64-bit flag.

Sincerely,
john