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Compiling with -ipo produces "unresolved" warning messages at link time on Cray systems

November 18, 2013 by Mike Stewart, NERSC USG (0 Comments)

Status:  Reported to the darshan developers.

This bug affects only our Cray systems Edison and Hopper.

When a code is linked with the Intel -ipo (enable interprocedural optimization) flag on Hopper or Edison, many warning messages like this will be printed:

ipo: warning #11021: unresolved __real___xstat64
        Referenced in libdarshan-posix.a(darshan-posix.o)

An executable will be produced and these warnings can safely be disregarded.

Since -ipo is also part of the optimizations included with the Intel -fast optimization arguments,  you will see these error messages with -fast unless you include the NERSC recommended -no-ipo flag along with the -fast flag.

You can avoid these messages by disabling darshan To do so, we recommend putting the following in your .bashrc.ext (bash shell users) or .cshrc.ext (c shell users) files:

module unload darshan

For more information on darshan, see our introduction here.

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