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<DIV dir=ltr align=left><SPAN class=953181305-02012009><FONT face=Arial
color=#0000ff size=2>You need to build the MPICH2 library separately for 32-bit
and 64-bit and install it in separate locations (via the --prefix option to
configure) so that you can invoke the right mpicxx. Before running configure,
set the environment variables CFLAGS, CXXFLAGS, FFLAGS, and F90FLAGS to pass the
requisite compiler options.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=953181305-02012009><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=953181305-02012009><FONT face=Arial
color=#0000ff size=2>Rajeev</FONT></SPAN></DIV><BR>
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<FONT face=Tahoma size=2><B>From:</B> mpich-discuss-bounces@mcs.anl.gov
[mailto:mpich-discuss-bounces@mcs.anl.gov] <B>On Behalf Of </B>Kevin Van
Workum<BR><B>Sent:</B> Wednesday, December 31, 2008 11:01 AM<BR><B>To:</B>
mpich-discuss@mcs.anl.gov<BR><B>Subject:</B> [mpich-discuss] compiling 32-bit
and 64-bit mpich2 applications<BR></FONT><BR></DIV>
<DIV></DIV>Dear All,<BR><BR>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:<BR><BR>$
mpicxx -m32 hello.cpp<BR>/usr/bin/ld: skipping incompatible
/usr/local/mpich2-1.0.5p4-ssm/lib/libmpichcxx.a when searching for
-lmpichcxx<BR>/usr/bin/ld: cannot find -lmpichcxx<BR>collect2: ld returned 1
exit status<BR><BR>Thanks,<BR><BR>Kevin<BR
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