[Bug fortran/18850] padding within a sequence type

[Bug fortran/18850] padding within a sequence type

[fxcoudert at gcc dot gnu dot org]

------- Comment #3 from fxcoudert at gcc dot gnu dot org  2007-08-06 13:15 -------
Maybe I'm completely off, but isn't the -fpack-derived option what is needed to
play with this padding? (it's hard for me to tell exactly, because I don't
really read assembly) If so, could we close the PR?


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fxcoudert at gcc dot gnu dot org changed:

           What    |Removed                     |Added
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                 CC|                            |fxcoudert at gcc dot gnu dot
                   |                            |org
             Status|NEW                         |WAITING


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18850

[Bug fortran/18850] padding within a sequence type

[fxcoudert at gcc dot gnu dot org]

------- Comment #4 from fxcoudert at gcc dot gnu dot org  2007-08-15 10:16 -------
Fixing as FIXED: I think the -fpack-derived option is used for this very
purpose.


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fxcoudert at gcc dot gnu dot org changed:

           What    |Removed                     |Added
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             Status|WAITING                     |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18850

[Bug fortran/18850] padding within a sequence type

[Thomas dot Koenig at online dot de]

------- Additional Comments From Thomas dot Koenig at online dot de  2004-12-06 08:37 -------
(In reply to comment #1)
> Alternatively, do other compilers omit padding in sequence types?

ifort does so, unless the '-pad' option is given:

http://www.intel.com/software/products/compilers/flin/docs/for_ug2/cmp_algn.htm

So does Compaq fortran, unless you specify /align:sequence :

http://h18009.www1.hp.com/fortran/docs/vf-html/pg/pgualopt.htm

xlf also does it, but marks it as an extension:

http://www-1.ibm.com/support/docview.wss?uid=swg27003923&aid=1 , page 454:

# The size of a sequence derived type is equal to the number of bytes
# of storage needed to hold all of the components of that derived type.


The point seems somewhat to be in contention as far as a standards
requirement is concerned:

http://j3-fortran.org/doc/meeting/150/99-190.txt

I've changed the bug type to "enhancement" with this.

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           What    |Removed                     |Added
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           Severity|normal                      |enhancement
             Status|WAITING                     |NEW
     Ever Confirmed|                            |1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18850

[Bug fortran/18850] padding within a sequence type

[tobi at gcc dot gnu dot org]

------- Additional Comments From tobi at gcc dot gnu dot org  2004-12-05 20:47 -------
Can you point to a part in the standard which supports this claim? Looking
through it I didn't see anything supporting this claim.

Alternatively, do other compilers omit padding in sequence types? In this case
we might want to support this out of compatibility reasonings.

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           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |WAITING


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18850