Attached program generates a segfault when compiled with bounds-check enabled. There is nothing strange in the code that I can see (though of course I might be proven wrong).
[EMAIL PROTECTED] sfilippo]$ gfortran -v Using built-in specs. Target: i686-pc-linux-gnu Configured with: ../gcc-4.2-20060318/configure --prefix=/usr/local/gfortran Thread model: posix gcc version 4.2.0 20060318 (experimental) [EMAIL PROTECTED] sfilippo]$ gfortran -o assoc assoc.f90 [EMAIL PROTECTED] sfilippo]$ ./assoc F T F F T T [EMAIL PROTECTED] sfilippo]$ gfortran -o assoc assoc.f90 -fbounds-check [EMAIL PROTECTED] sfilippo]$ ./assoc F T Segmentation fault (core dumped) -- Summary: -fbounds-check generates segfault Product: gcc Version: 4.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: fortran AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: sfilippone at uniroma2 dot it GCC host triplet: i686-pc-linux-gnu GCC target triplet: i686-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26801