1. Dynamically Loaded Shared Libraries and dbx
Program and libraries have proper common resolution, but dbx doesn't.
Mixed C & FORTRAN main executable exports a common block.
FORTRAN shared library imports the common block.
Main executable dynamically loads shared library (load & loadbind),
then invokes a subroutine in the shared library (exported, of course).
The subroutine references the exported common in the process of
performing it's function.
This program works fine! Even in dbx. But dbx doesn't work fine.
While stepping through a subroutine in the library, I attempt to print
the value of a common variable exported from the main executable, and
dbx gives a value which I know not to be true, and which would break
the program if it were.
Here's a partial transcript (with the names changed for clarity) to
show you what I mean. The main characters are:
GLOBVAR, a common variable which is exported from the main executable
LOCVAR, a local variable (in the subroutine)
stopped in file1 at line 96 in file "file1.f"
96 LOCVAR = GLOBVAR
(dbx) p LOCVAR,GLOBVAR
stopped in file1 at line 97 in file "file1.f"
97 IPTNDI = 0
(dbx) p LOCVAR,GLOBVAR
(dbx) whatis LOCVAR
(dbx) whatis GLOBVAR
I believe that the debugger is looking at a local copy of the common,
rather than the exported copy that the actual code uses. What I'm
looking for is a way to tell dbx to look at the same common the
Since this is a large project, with more than 50 shared libraries,
hundreds of common blocks, thousands of source files, and half a dozen
developers, I'm looking for a general debugging solution which doesn't
require code changes.
I'll summarize to the net. Thanks.
The above statements are not the opinions or policies of SPSS Inc.
The above statements may not be the opinions of Brent Lambert.
The first disclaimer is a policy of SPSS Inc.
Subsequent disclaimers are probably the opinion of Brent Lambert.
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