[PATCH,fortran]: fix bind(c) common block alignment

[Steve Kargl]

On Mon, Aug 06, 2007 at 11:17:01AM -0600, Christopher D. Rickett wrote:
> 
> currently, the patch only changes the alignment if the common block is 
> bind(c), which means the compiler should have already verified that the 
> common block fields interop with C.
> 
> as to why we weren't seeing it before, i do not know.  the 
> bind_c_coms.f90/bind_c_coms_driver.c illustrates on x86 linux that there 
> is a difference in the alignment.  the generated assembly shows it, but 
> the linker didn't complain.
> 
> if it is acceptable for all common blocks to choose a C compatible 
> alignment, then the patch is trivial to change to do this.  is that what 
> people prefer?
> 

One thing to keep in mind is derived types that appear in
common blocks.  These have SEQUENCE, and I suspect the 
current alignment guarantees that SEQUENCE gives expected
results. 

-- 
Steve