[mpich-discuss] compiling 32-bit and 64-bit mpich2 applications

[Kevin Van Workum]

Dear All,

How can I pass the -m32 (gcc) option to mpicxx to build 32-bit applications
on my 64-bit machine? I suppose I could have to separate installations of
mpich2, but I'd like to be able to use the same installation. This is the
error I get now if I try to use -m32:

$ mpicxx -m32 hello.cpp
/usr/bin/ld: skipping incompatible
/usr/local/mpich2-1.0.5p4-ssm/lib/libmpichcxx.a when searching for
-lmpichcxx
/usr/bin/ld: cannot find -lmpichcxx
collect2: ld returned 1 exit status

Thanks,

Kevin
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