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Unable to get debug info from member variables
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 Unable to get debug info from member variables - Aug. 19, '04, 10:59:35 AM
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bvn
Posts: 15
Joined: Mar. 18, '04,
Status: offline
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With the current version of gdb (the one shipped with SFU 3.5) I was unable to get debug info from member variables:
Breakpoint 2, _ZN7MTMatHe6mpLoadEPKc (this=<incomplete type>, cName=0x124f310 "F1") at /project35/Modelling/source/MT/MTServer/MT_MatHe.c:50
(gdb) print mvName
No symbol "mvName" in current context.
(gdb) print this->mvName
Attempt to extract a component of a value that is not a structure pointer.
(gdb) set language c++
Warning: the current language does not match this frame.
(gdb) print mvName
Internal error: `this' is not an aggregate
(gdb) print this->mvName
Internal error: `this' is not an aggregate
This seems to be happening with "const" parameters/member variables.
By passing the 'this' pointer to a local function the data can be retrieved. This is a workaroun that requires editing the code for each debug session. As we have lots of source code (around 500MB) an need to maintain it with only 4 people, it is almost impossible to modify all the code to include this workaround.
Is this behaviour known (as a bug)?
Some remarks of less importance:
As our C++ source file has a .c suffix the automatic language selection sees it as a C file.
Apparently name demangling of C++ functions is not properly done when listing stack. Selection of member functions for setting breakpoints works fine.
Also for a 'const int' function parameter we got an <incomplete type>
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RE: Unable to get debug info from member variables - Aug. 19, '04, 2:30:12 PM
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Rodney
Posts: 3714
Joined: Jul. 9, '02,
From: /Tools lab
Status: offline
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> Is this behaviour known (as a bug)?
Yes.
As I understand it (and someone else can correct me if needed) that the effort
went to getting gdb working on C code. So there are shortcomings with
using gdb and C++ code. For debugging you can also use truss to
follow system calls.
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RE: Unable to get debug info from member variables - Aug. 20, '04, 4:22:38 AM
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bvn
Posts: 15
Joined: Mar. 18, '04,
Status: offline
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Are there plans to improve the gdb to also work with C++ code ?
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RE: Unable to get debug info from member variables - Aug. 10, '06, 10:26:16 AM
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asfoster
Posts: 36
Joined: Oct. 18, '05,
From: Lincolnshire UK
Status: offline
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I know that this is some time later than the above postings - but I am having the same problem. Only my code is ALL C - no C++ to be seen.
I can see structs and their member data for code in the main code blocks in the app but anything in linked-in archive files (.a files) does not play ball.
This is a major blow. The majority of our code (in excess of 1 million lines) is in library file form (normally as shared-objects but gdb on Interix has real trouble getting to code in shared objects so I rebuild as .a to enable gdb to operate with them).
I have tried building the gdb 6.4 source but it bails out after about 5 minutes saying that it does not support the interix system.
Is there a fix to gdb on Interix that I can use?
Andy Foster
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RE: Unable to get debug info from member variables - Aug. 10, '06, 12:37:32 PM
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Rodney
Posts: 3714
Joined: Jul. 9, '02,
From: /Tools lab
Status: offline
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I don't know if there is a plan or isn't plan.
Some of the Microsoft development group reads the messages here at
least occationally, but I don't know anymore than that.
If you have an MS rep assigned to your company you might get him/her
to try and ask as well. Getting the reps involved sometimes get results.
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