[Pw_forum] newbie - installation problem

[Carlo Nervi]

Dear Lorenzo,
thank you very much for quick reply.
Indeed you perfectly get the problem.
I still have some difficulties, (how to correctly set the flags for SMP 
parallel compilation - no MPI, even though I have MPI installed) but I'm 
working on them.
Indeed I have a 8 CPU SMP linux (no cluster, a simple single dual socket 
xeon MB).

Thank you again,
   Carlo

Lorenzo Paulatto ha scritto:
> On Tue, 03 Mar 2009 15:44:12 +0100, Carlo Nervi <carlo.nervi at unito.it> wrote:
>> When I type make all, ifort compile all, but it exit with the following
>> message:
>> ipo: warning #11041: unresolved iotk_print_kinds_x_
>>          Referenced in /tmp/ipo_ifort86WxDo.o
> 
> Dear carlo,
> QE configure script uses the default system archiver (ar) when using ifort compiler instead of intel's own wrapper (xiar); unluckily interprocedural optimization (IPO) does not work with ar.
> 
> You have two possible solutions:
> 1. disable IPO (by setting the -noipo in F90FLAGS in file make.sys)
> 2. use xiar instead of ar (by setting the AR variable to xiar in file make.sys)
> 
> Personally I don't think IPO gives a substantial performance increase, hence I just disable it most of the time (furthermore it's disabled by default on most ifort versions).
> 
> cheers
> 
> 


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