[Bug fortran/76490] New: when use -O2 -fcheck-founds compiler appears to hang and consumes all memory

[urbanjost at comcast dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=76490

            Bug ID: 76490
           Summary: when use -O2 -fcheck-founds compiler appears to hang
                    and consumes all memory
           Product: gcc
           Version: 5.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: urbanjost at comcast dot net
  Target Milestone: ---

Routine that has compiled for years with gfortran 4.9.6 and older versions now
hangs compiler when -O2 -fbound-checks is used. Running on Cygwin with 5.4.0
version. Reduced to simple test case. Might be duplicate of other reports of
all memory being consumed but none seems to match exactly. Small test program
wrapped in a bash(1) shell attached.

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