reorder elements or use -fno-align-commons

[Jack Howarth]

  What exactly are the implications of warnings like...

    Included at xadc.f:785:

      COMMON /IXADC1/  EXPXADCPTRS,                                            
                     1
Warning: COMMON 'ixadc1' at (1) requires 4 bytes of padding at start; reorder elements or use -fno-align-commons
xadc.fcm:75.21:

...from current gcc trunk. I see a number of these warnings when compiling xplor-nih
but they don't seem to be associated with any regressions. Do these warnings imply a
possible wrong-code generation because of the incorrect alignment or just a suboptimal
ability for gfortran to do code optimizations? Thanks in advance for any clarifications
on this warning.
          Jack