[Bug lto/56706] New: failure building CP2K at -flto -O3

[Joost.VandeVondele at mat dot ethz.ch]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56706

             Bug #: 56706
           Summary: failure building CP2K at -flto -O3
    Classification: Unclassified
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: Joost.VandeVondele@mat.ethz.ch


The 4.8.1 branch fails to build CP2K in LTO mode. At linking, the following
error message appears:

/data/vjoost/clean/cp2k/cp2k/makefiles/../src/dbcsr_lib/dbcsr_blas_operations.F:64:
error: undefined reference to 'iseed.2556.979179.13933'
/data/vjoost/clean/cp2k/cp2k/makefiles/../src/dbcsr_lib/dbcsr_blas_operations.F:62:
error: undefined reference to 'iseed.2556.979179.13933'
/data/vjoost/clean/cp2k/cp2k/makefiles/../src/dbcsr_lib/dbcsr_blas_operations.F:58:
error: undefined reference to 'iseed.2556.979179.13933'
/data/vjoost/clean/cp2k/cp2k/makefiles/../src/dbcsr_lib/dbcsr_blas_operations.F:60:
error: undefined reference to 'iseed.2556.979179.13933'
collect2: error: ld returned 1 exit status

The error is absent if the optimization options used are -flto -O1 instead of
-flto -O2.

I have not been able to reduce this to a small testcase, so I'll post as simple
as possible build instructions in a next comment