[Xapian-discuss] Debug build

[Olly Betts]

On Wed, Mar 17, 2010 at 11:06:17AM +0100, double wrote:
> Thank you very much for your answer. In order to track down
> the issue I forced a core dump on `atexit()`.
>
> Xapian is 1.1.4, the database is flint. Here the dmalloc-report:
>
> -->  13904  times:
> 0xb778cad4 <_ZNSs4_Rep9_S_createEjjRKSaIcE+100>:        0xc7047089
>[...]

As I said, I'm not familiar with dmalloc.  You'll need to explain what this
output means...

> List<struct Result> fts_functionname( ... )
> {
>[...]

If there's really a leak here, just posting snippets of code isn't much help.
In order to fix this, I really need to be able to reproduce it.  So please
supply a complete self-contained example, with any necessary instructions on
how to build and run it.

It's probably best to open a ticket on http://trac.xapian.org/ for it.

>> If you use GCC, configure compiles with "-g -O2" by default, so you have
>> debug symbols by default.  
>
> Maybe the debug symbols are cut off during linking? GDB is
> not able to determine the code-lines.

The GNU toolchain preserves debug symbols when linking by default, and I can
certainly see line numbers in gdb with a default-built xapian-core.

I have found C++ debugging works better in newer GCC and GDB versions, and
-O0 is needed to allow all variable values to be read.

Cheers,
    Olly