Re: problem in glibc backtrace done inside nptl library

["Vinu Rajashekhar" <vinutheraj at gmail dot com>]

So its basically saying that the inlining should be left on,
so can you please tell me if there is some way possible through
which I can retrieve the symbol names in-program, maybe using
the debugging symbols or something  because I really need it.

On Tue, Jun 17, 2008 at 10:51 PM, Carlos O'Donell
<carlos@systemhalted.org> wrote:
> On Tue, Jun 17, 2008 at 12:27 PM, Vinu Rajashekhar <vinutheraj@gmail.com> wrote:
>> I used addr2line function and it is showing the functions,
>> but I used the -fno-inline and -fno-inline-functions in compiling the files
>> like pthread_mutex_init.c and other nptl files, is there something else
>> I need to add to make it not inline like in the linking stage ?
>>
>> I couldnt use the -O0 flag because there is some problem during glibc build
>> if I use that.
>
> From the glibc FAQ:
> ~~~
> 1.23.   Why do I get:
>        `#error "glibc cannot be compiled without optimization"',
>        when trying to compile GNU libc with GNU CC?
>
> {AJ,CO} There are a couple of reasons why the GNU C library will not work
> correctly if it is not complied with optimzation.
>
> In the early startup of the dynamic loader (_dl_start), before
> relocation of the PLT, you cannot make function calls. You must inline
> the functions you will use during early startup, or call compiler
> builtins (__builtin_*).
>
> Without optimizations enabled GNU CC will not inline functions. The
> early startup of the dynamic loader will make function calls via an
> unrelocated PLT and crash.
>
> Without auditing the dynamic linker code it would be difficult to remove
> this requirement.
>
> Another reason is that nested functions must be inlined in many cases to
> avoid executable stacks.
>
> In practice there is no reason to compile without optimizations, therefore
> we require that GNU libc be compiled with optimizations enabled.
> ~~~
>



-- 
Vinu Rajashekhar,
3rd Year Dual Degree Student,
Deptt of Computer Science & Engg,
IIT Kharagpur,
India.