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Re: how to use libgcc2.c

From: Jim Wilson <wilson at tuliptree dot org>
To: qinfeng dot zhang at philips dot com
Cc: gcc-help at gcc dot gnu dot org, gcc at gcc dot gnu dot org
Date: Fri, 06 Jun 2003 10:35:04 -0700
Subject: Re: how to use libgcc2.c
References: <OF9808165C.CA7F4D29-ON48256D3D.00285B77-48256D3D.00281395@diamond.philips.com>

qinfeng.zhang@philips.com wrote:

In gcc source code, there is a file "libgcc2.c" in srcdir/gcc. It seems that this file is used to
implement operation through software method. But I don't know using it, and I can't debug into this
file.

libgcc contains compiler support routines. It is used automatically by the compiler if the source code performs an arithmetic operation that requires calling a function to perform it. For instance, a long long divide on many targets will generate a call to a libgcc function.

User source code should not call any routines in libgcc.

There shouldn't be any need to debug routines in libgcc, but it should be possible if you have a copy of the gcc sources available. Some old versions of gcc compiled libgcc with -g1 which makes debugging difficult. You can change the gcc Makefile to use -g instead if necessary.

Jim

References:
- how to use libgcc2.c
  - From: qinfeng . zhang

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