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Re: GCC 4.6.1 emits discriminators in DWARF2 mode

From: Eric Botcazou <ebotcazou at adacore dot com>
To: Anitha Boyapati <anitha dot boyapati at gmail dot com>
Cc: gcc at gcc dot gnu dot org
Date: Thu, 20 Oct 2011 23:07:00 +0200
Subject: Re: GCC 4.6.1 emits discriminators in DWARF2 mode
References: <CAMHf9jKSOMqoDu4Sx0Sequo4XB9R8NJNcJMciXTUE7ibF=qpfw@mail.gmail.com>

> Firstly, aren't discriminators introduced in DWARF 4? Little more
> digging shows that the following fix is missing in 4.6.1 release. It
> breaks the current dwarf2 parsers/readers. I think it is worth filing
> a bug.
>
> http://gcc.gnu.org/viewcvs/trunk/gcc/dwarf2out.c?r1=171846&r2=171852&diff_f
>ormat=h

Yes, this is a real nuisance for some DWARF consumers.  You need to ask a RM 
about backporting the fix.

> Secondly, in gcc4.5.1, the directive (.loc) is not emitted and still
> we are able to map line numbers to address. Please help me understand
> how introducing .loc directive affects debug_line format in gcc 4.6.1.

.loc directives are processed by the assembler, which then builds .debug_line.

-- 
Eric Botcazou

References:
- GCC 4.6.1 emits discriminators in DWARF2 mode
  - From: Anitha Boyapati

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