[Bug fortran/35037] VOLATILE attribute not being honored with common block variable

[burnus at gcc dot gnu dot org]

------- Comment #4 from burnus at gcc dot gnu dot org  2008-02-04 20:58 -------
> But I'm useless at reading assembly (the tree dump doesn't have these
> attributes written out)

Try something like the following with -O3 -fdump-tree-optimized:

      subroutine wait4it ()
        logical event
        volatile event
!        common /dd/ event
        event = .false.
        do
          if (event) print *, 'gfhzjf'
        end do
      end subroutine

I did not test your patch, but without the common line, the dump contains
"gfhzjf" until you remove the volatile. This saves you from reading assembler.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35037