[Plplot-devel] fortran iargc() and getarg() on Cygwin

[Alan W. I. <ir...@be...>]

On 2005-11-21 08:35+0100 Arjen Markus wrote:

> ...Cygwin 
> ...trouble
> with the iargc() and getarg() routines, used to obtain the (fortran) command-line
> arguments....

That brings us to a new subject.

Could you demonstrate with the short example below under what conditions
iargc and getarg do not work for the Cygwin environment?

********** example to test iargc and getarg capability
       implicit none
       character*4 argument
       integer i
       write(*,*) 'number of arguments = ', iargc()
       do i = 1,5
         call getarg(i,argument)
         write(*,'(i5,x,a4)') i, argument
       enddo
       end
**********

On my system I obtain  the following results:

irwin@chickadee> g77 test_command_line_parse.f -o test_command_line_parse
irwin@chickadee> ./test_command_line_parse a b c
  number of arguments =  3
     1 a
     2 b
     3 c
     4
     5

Do you get a similar result?

If that simple demonstration succeeds for you, will you please turn it into
the form similar to the PLplot form that fails?  That is, make the above
fortran a separate routine in a one-routine shared library which is called
from a main routine?  That would allow you to make some easy experiments
(such as trying the -fPIC option or not that we discussed before) to see
what is the root of the shared library problem.

If you do find a way to get the shared library version to work (such as
using the -fPIC option), then I will take your solution to the libtool list
so they can use it for a permanent solution.  I found them to be most
helpful and responsive when earlier this year we could demonstrate a clear
MinGW libtool problem and solution.  On the other hand, if there is no way
you can find to make the shared library version work, then we should take
that simple demonstration of the problem to the Cygwin development list so
they can fix it.

Alan
__________________________
Alan W. Irwin
email: ir...@be...
phone: 250-727-2902

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the Yorick front-end to PLplot (yplot.sf.net); the
Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
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