upgrading gcc/gfortran on linux, glibc=2.5

[Paul Richard Thomas]

Dear Tom,

I am glad that you sent this to the fortran list.  There are people
out here that are far more expert than I am at answering the sort of
questions that you are answering.  In fact, I tried a few months back
to build gfortran without root privileges and failed precisely because
glibc versions did not match.  I did not try very hard, mark you :-)

Cheers

Paul

On Wed, Mar 28, 2012 at 5:53 PM, Tom Roche <Tom_Roche@pobox.com> wrote:
>
> Paul Richard Thomas Wed, 28 Mar 2012 16:26:17 +0200
>> I believe that I have RHEL5.4 as a virtual machine at home. If so,
>> I'll build a release version of 4.7.0 on it.
>
> Thanks!
>
>> It'll take a few days because I know that some of the dependencies
>> will need updating and all the usual good stuff. I have to say that,
>> whilst I am a gfortran maintainer and would say this :-), building
>> your own is very straight forward on linices
>
> Except we lack root :-( Our cluster (which is currently running
>
> $ lsb_release -ds
> "Red Hat Enterprise Linux Server release 5.4 (Tikanga)"
> $ gfortran --version
> GNU Fortran (GCC) 4.1.2 20080704 (Red Hat 4.1.2-46)
> $ ldd --version
> ldd (GNU libc) 2.5
>
> ) is maintained by contractors for a larger group, who dissuade us
> from building dependencies as fundamental as gcc. While there are
> plans to upgrade the cluster to RHEL 6 "soon," that may not be for
> months, and anyway that would only get us to gcc-4.4 (IIUC). However,
> one of the admins has stated
>
>> I tried to compile the 4.6 version of GCC from source and could not
>> get it to work. If you have a working version, I would be happy to
>> put it [up]
>
> so if you can build gcc-4.7, that should work. However I also note
>
> http://gfortran.com/download/x86_64/PLEASE_README.txt
>> this directory
>
> http://gfortran.com/download/x86_64/
>
>> [provides] GCC builds for linux x86_64 systems[, including]
>> compilers for the c, c++ and fortran languages built on a linux
>> system with glibc 2.6.1.
>
>> The provided [compilers] need glibc 2.4 or newer, however the
>> library libgomp needs glibc 2.6,
>
> Unfortunately we do need OMP for the parallel versions of our model,
> though being able to build/test serial with a newer gcc/gfortran would
> be good for us. I note
>
> $ ldconfig -p | fgrep -ie 'omp'
> -bash: ldconfig: command not found
> $ locate *gomp* | fgrep -e '.so'
> /usr/lib/gcc/x86_64-redhat-linux/4.1.1/libgomp.so
> /usr/lib/gcc/x86_64-redhat-linux/4.1.1/32/libgomp.so
> /usr/lib64/libgomp.so.1
> /usr/lib64/libgomp.so.1.0.0
>
> So I'm wondering,
>
> 1 Can we also get or build glibc >= 2.6 for RHEL 5.4?
>
> 2 If we cannot build/get a glibc >= 2.6: what is the latest gcc with a
>  libgomp that works with glibc == 2.5?
>
> TIA, Tom Roche <Tom_Roche@pobox.com>



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