[mpich-discuss] MPICH2-1.3.1 libmpich.a: relocation R_X86_64_32 against `mpifcmb2_' can not be used when making a shared object; recompile with -fPIC

[Sunil Thomas]

Hi Dave,

    Thanks for the response. Actually I added "-fPIC" to both CFLAGS and
CXXFLAGS in my next try. I've always
been building with --enable-shared, and only started adding the flags after
I got the error recommending them. But
I still got the error (second one mentioned in the e-mail).

     Yes, my application is being built with "-fPIC" as well. The only fix I
found so far is tos specify the link against
the shared object (.so) mpich libraries, instead of static ones.

Thanks!
--Sunil.

On Fri, Jan 7, 2011 at 11:25 AM, Dave Goodell <goodell at mcs.anl.gov> wrote:

> Well, you might be able to solve your C++ application build error by using
> the same workaround you used for C.  Add "-fPIC" to your CXXFLAGS when you
> build MPICH2.
>
> However, that said, it shouldn't be necessary to add those flags to your
> plain old CFLAGS/CXXFLAGS when building MPICH2 with "--enable-shared".  Are
> you building your application with "-fPIC" as well?  If not, then the reason
> that adding those to MPICH2's build flags fixes your problem is because that
> flag is then added to the mpicc and mpicxx compiler wrapper scripts.
>
> -Dave
>
> On Jan 6, 2011, at 10:24 PM CST, Sunil Thomas wrote:
>
> > Just to follow-up on this issue; I resolved it by linking instead against
> the dynamic library
> > libmpich.so (shared objects files). I am configuring this entirely with
> cmake and it could
> > very well be that I am not specifying the right things in the cmake file
> (but I still feel the
> > previous version should work, using the static libs).
> >
> > Any further thoughts on this will be appreciated..
> >
> > --Sunil.
> >
> > On Thu, Jan 6, 2011 at 8:02 PM, Sunil Thomas <sgthomas27 at gmail.com>
> wrote:
> > Hi,
> >
> >    First I built mpich2-1.3.1 following the directions in install.pdf doc
> with --enable-shared
> > and the built and install complete successfully but I got the following
> error when building
> > my application:
> >
> > relocation R_X86_64_32 against `a local symbol' can not be used when
> making a shared object,
> > recompile with -fPIC  (Could not read symbols: Bad value)
> >
> >
> >    Then I built mpich2-1.3.1 with CFLAGS=-fPIC and --enable-shared and
> the build and install
> > again comlpete successfully. (This is on RHEL 5). However when I try to
> build my application
> > using the resulting mpicxx compilers and link to the installed mpich
> libraries (my application
> > is written in C++), this time I got the following error:
> >
> >  relocation R_X86_64_32 against `mpifcmb2_' can not be used when making a
> shared object;
> > recompile with -fPIC (Could not read symbols: Bad value)
> >
> > Greatly appreciate any advice on a fix to the this issue. Let me know if
> I can provide more
> > info.
> >
> > Thanks!
> > --Sunil.
> >
> >
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> > mpich-discuss at mcs.anl.gov
> > https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss
>
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