https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66073
H.J. Lu <hjl.tools at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2015-05-08 CC| |tkoenig at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> --- It is caused by r222864: gfortran -c -o cluster.fppized.o -O2 -ffast-math cluster.fppized.f90 cluster.fppized.f90:1199:0: in_pos = matmul(self%crystal%unitcell%direct_matrix,self%geometry(:,in_atom)) 1 internal compiler error: in gfc_walk_array_ref, at fortran/trans-array.c:8900 Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. specmake: *** [cluster.fppized.o] Error 1 specmake: *** Waiting for unfinished jobs....