https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68649
Bug ID: 68649
Summary: note: code may be misoptimized unless
-fno-strict-aliasing is used
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: Joost.VandeVondele at mat dot ethz.ch
Target Milestone: ---
Today's trunk produces a lot of warnings / notes all referring to functions
from libgfortran, when compiling CP2K with LTO. I'm looking at generating a
reduced testcase, but the first obvious tries didn't work.
/data/vjoost/gnu/cp2k/cp2k/makefiles/../src/dbcsr_lib/dbcsr_block_access_c.F:709:0:
note: ‘_gfortran_reshape_c4’ was previously declared here
data_block%p(:,:) = RESHAPE (block, (/row_size, col_size/))
/data/vjoost/gnu/cp2k/cp2k/makefiles/../src/dbcsr_lib/dbcsr_block_access_c.F:709:0:
note: code may be misoptimized unless -fno-strict-aliasing is used
/data/vjoost/gnu/cp2k/cp2k/makefiles/../src/helium_methods.F:1071:0: warning:
type of ‘_gfortran_unpack1’ does not match original declaration
[-Wlto-type-mismatch]
helium%pos(:,:,:) = UNPACK(message(offset+1:offset+msglen), MASK=m,
FIELD=f )
/data/vjoost/gnu/cp2k/cp2k/makefiles/../src/helium_methods.F:1699:0: warning:
type of ‘_gfortran_unpack1’ does not match original declaration
[-Wlto-type-mismatch]
helium%rho_rstr(:,:,:,:) = UNPACK(message(1:msglen), MASK=m, FIELD=f)
/data/vjoost/gnu/cp2k/cp2k/makefiles/../src/helium_methods.F:1547:0: note:
‘_gfortran_unpack1’ was previously declared here
ig(:,:) = UNPACK(message(offset+33:offset+38), MASK=m, FIELD=f )
/data/vjoost/gnu/cp2k/cp2k/makefiles/../src/helium_methods.F:1547:0: note: code
may be misoptimized unless -fno-strict-aliasing is used
/data/vjoost/gnu/cp2k/cp2k/makefiles/../src/dbcsr_lib/dbcsr_block_access_s.F:709:0:
warning: type of ‘_gfortran_reshape_r4’ does not match original declaration
[-Wlto-type-mismatch]
data_block%p(:,:) = RESHAPE (block, (/row_size, col_size/))
/data/vjoost/gnu/cp2k/cp2k/makefiles/../src/dbcsr_lib/dbcsr_block_access_s.F:709:0:
warning: type of ‘_gfortran_reshape_r4’ does not match original declaration
[-Wlto-type-mismatch]
