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: unassig...@gcc.gnu.org
ReportedBy: joost.vandevond...@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
