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To: gdb@sources.redhat.com
From:  Vladimir Prus <ghost@cs.msu.su>
Subject:  Re: Multiple breakpoint locations
Date: Tue, 13 Nov 2007 19:28:00 -0000
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Nick Roberts wrote:

> 
> The new code for breakpoints with multiple locations looks very good and
> addresses a common complaint about GDB.  I have a couple of points and
> apologise if they have already been discussed.
> 
> Folowing the example in the manual:
> 
>      Num     Type           Disp Enb  Address    What
>      1       breakpoint     keep y    <MULTIPLE>
>              stop only if i==1
>              breakpoint already hit 1 time
>      1.1                         y    0x080486a2 in void foo<int>() at
>      t.cc:8
>      1.2                         y    0x080486ca in void foo<double>() at
>      t.cc:8
> 
> 
> 1) I can enable/disable 1.1 and 1.2 but not delete them:
> 
>   (gdb) dis 1.1
> 
>      Num     Type           Disp Enb  Address    What
>      1       breakpoint     keep y    <MULTIPLE>
>              stop only if i==1
>              breakpoint already hit 1 time
>      1.1                         n    0x080486a2 in void foo<int>() at
>      t.cc:8
>      1.2                         y    0x080486ca in void foo<double>() at
>      t.cc:8
> 
>   (gdb) d 1.1
>   warning: bad breakpoint number at or near '1.1'

Well, you can't really delete a location -- if breakpoint expression
corresponds to 20 addresses, that's the way it is -- you cannot delete
some of those addresses from the program ;-)

> 2) I can enable/disable 1 and this appears to enable/disable all the
> locations.
>    Perhap this could be documented in the manual.

Well yes. Patches welcome ;-)

> 3) I created this breakpoint by specifying the line but if I do:
> 
>     b foo<int>()
> 
>    or any variant I can think of, I just get a pending breakpoint as GDB
>    doesn't recognise the location.  Can such locations be specified on the
>    command line by name?

Does

        b 'void foo<int>()'

work better?

- Volodya