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From: awdorrin <awdorrin@gmail.com>
Newsgroups: comp.lang.ada
Subject: Debugging Ada
Date: Wed, 21 Dec 2011 07:14:46 -0800 (PST)
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Date: 2011-12-21T07:14:46-08:00
List-Id: <comp.lang.ada>

I am having an odd problem with a multi-threaded application that is a
combination of C and Ada.

During elaboration, the Ada code is setting a constant string that it
retrieves from another package:

LAN_CFG_FILE : constant String := SysConfig.Cfg_Filename( LAN_CFG );

Then in the package's main procedure when I try to use the
LAN_CFG_FILE, sometimes the value is corrupted. I realize that
something is either blowing a buffer, or there is a threading issue
that is corrupting the stack, however here is my problem:

When I try to get the address of LAN_CFG_FILE in GDB, so I can set a
watch, I get the response:

"Attempt to take address of value not located in memory."

For example:
(gdb) p LAN_CFG_FILE
$7 = "/home/aldorr/config/lan.cfg"
(gdb) p LAN_CFG_FILE'Address
Attempt to take address of value not located in memory.
(gdb) p &LAN_CFG_FILE
Attempt to take address of value not located in memory.

I really am not sure why the print of the variable works, but I can't
determine where the variable is located...

This may not be an Ada issue, but more a GDB issue - but figured any
GDB forums would likely not have the Ada expertise that this forum
would.

-Al