[Bug fortran/30792] DATA implied-do substring allowed with -std=f95/f2003

["burnus at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #1 from burnus at gcc dot gnu dot org  2007-06-23 07:34 -------
R527 data-implied-do
        is ( data-i-do-object-list , data-i-do-variable = scalar-int-expr,
             scalar-int-expr [ , scalar-int-expr ] )
R528 data-i-do-object is array-element
                      or scalar-structure-component
                      or data-implied-do

which does not include substrings.

Related:
 character(len=20) :: a = 'xyz'
 data a(1:3)/'abc'/
-> Overlapping storage initializations (otherwise valid)
Should be detected with -std=f95.

 character(len=3) :: b
 integer :: i
 data (b(i:i),i=1,3)/3*'x'/
 data (b(i:i),i=2,2)/'y'/
 print *, b
-> Overlapping storage initializations (substrings are also not standard
conform)
-> Should this be detected or ignored?
(This is not detected by ifort either; both ifort and gfortran print 'xxx'; if
one reverses the data order, both print 'xyx'.)

Observation (should be ok either way):
 character(len=20) :: a
 data a(1:3)/'abc'/
 print '(":",a,":")', a
gfortran prints:
:abc                 :
g95, NAG f95, ifort print:
:abc:
(for "a = 'abc'" they have the same as gfortran. -> preinitialized by \0 vs. by
' '?)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30792