Request for status on fix for limitations with g77 -fdebug_kludge option

Request for status on fix for limitations with g77 -fdebug_kludge option

[Larry Cohen]

To Whom It May Concern;

 I have recently downloaded and installed gcc-2.95.2 and gdb-5.0 packages
 for the purposes of compiling and running FORTRAN-77 programs.  The gcc
 package documentation states that gdb is currently incapable of printing
 out the values of variables that are part of COMMON BLOCK storage and
 that rudimentary COMMON BLOCK variable information could be retrieved
 within gdb by invoking the -fdebug-kludge option during the g77 compile
 process.  Also, the documentation states that this limitation in
 printing out the explicit value of a COMMON BLOCK variable will be fixed
 in some future release of gcc and gdb.  Would you please send me any
 information about when these future gcc and gdb releases (that print out
 the value of a COMMON BLOCK variable) will occur.


Larry Cohen
Senior Analyst
Science Applications International Corporation
2018-A Lewis Turner Blvd.
Ft. Walton Beach, FL 32547
Tel.: (850) 863 - 3124
Fax: (850) 862 -0720
e-mail: cohenl@saic.com

Re: Request for status on fix for limitations with g77 -fdebug_kludge option

[Alexandre Oliva]

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On May 23, 2000, "Larry Cohen" <Larry.J.Cohen@saic.com> wrote:

>  Would you please send me any information about when these future
>  gcc and gdb releases (that print out the value of a COMMON BLOCK
>  variable) will occur.

When someone contributes this feature.

-- 
Alexandre Oliva    Enjoy Guaraná, see http://www.ic.unicamp.br/~oliva/
Cygnus Solutions, a Red Hat company        aoliva@{redhat, cygnus}.com
Free Software Developer and Evangelist    CS PhD student at IC-Unicamp
oliva@{lsd.ic.unicamp.br, gnu.org}   Write to mailing lists, not to me

Re: Request for status on fix for limitations with g77 -fdebug_kludge option

[Andrew Cagney]

Larry Cohen wrote:
> 
> To Whom It May Concern;
> 
>  I have recently downloaded and installed gcc-2.95.2 and gdb-5.0 packages
>  for the purposes of compiling and running FORTRAN-77 programs.  The gcc
>  package documentation states that gdb is currently incapable of printing
>  out the values of variables that are part of COMMON BLOCK storage and
>  that rudimentary COMMON BLOCK variable information could be retrieved
>  within gdb by invoking the -fdebug-kludge option during the g77 compile
>  process.  Also, the documentation states that this limitation in
>  printing out the explicit value of a COMMON BLOCK variable will be fixed
>  in some future release of gcc and gdb.  Would you please send me any
>  information about when these future gcc and gdb releases (that print out
>  the value of a COMMON BLOCK variable) will occur.

FYI,

At present there is no active Fortran GDB maintainer and effectivly zero
activity on GDB's support for fortran :-(
Definitly an oportunity in the making for anyone interested.

	Andrew

Re: Request for status on fix for limitations with g77 -fdebug_kludge option

[Toon Moene]

Andrew Cagney wrote:

>Larry Cohen wrote:

>> The gcc
>>  package documentation states that gdb is currently incapable of printing
>>  out the values of variables that are part of COMMON BLOCK storage and
>>  that rudimentary COMMON BLOCK variable information could be retrieved
>>  within gdb by invoking the -fdebug-kludge option during the g77 compile
>>  process.

> At present there is no active Fortran GDB maintainer and effectivly 
> zero activity on GDB's support for fortran :-(

While this is true, to the best of my knowledge the issue with printing
COMMON BLOCK items in gdb has been solved (it was a limitation of the
way g77 wrote debug information).

The solution is in the CVS mainline of GCC.  Pick any recent snapshot of
GCC if you can't use CVS and see if using just -g solves your problem.

--
Toon Moene, KNMI, PO Box 201, 3730 AE De Bilt, The Netherlands.
Tel. +31302206443, Fax +31302210407,  e-mail moene@knmi.nl
URL: http://www.knmi.nl/hirlam