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Date: Fri, 20 Mar 2015 07:59:00 -0000
From: Eli Zaretskii <eliz@gnu.org>
Subject: Re: No source file named getopt.c.
In-reply-to: <CAGmPkf+mTt7xhZmWkR4oN-9h6jki1MUh8Rn0G06YhS4pQ8=H1A@mail.gmail.com>
To: Fei Ding <fdingiit@gmail.com>
Cc: gdb@sourceware.org
Reply-to: Eli Zaretskii <eliz@gnu.org>
Message-id: <83a8z8w13l.fsf@gnu.org>
References: <CAGmPkf+mTt7xhZmWkR4oN-9h6jki1MUh8Rn0G06YhS4pQ8=H1A@mail.gmail.com>
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> Date: Fri, 20 Mar 2015 14:09:00 +0800
> From: Fei Ding <fdingiit@gmail.com>
> 
> I want to set a break point on some code in getopt.c, but I just got:
> 
> ////////////////////////////////////////////
> (gdb) b getopt.c:100
> No source file named getopt.c.
> ////////////////////////////////////////////
> 
> then, I did this to add the source directory of that code, as:
> 
> ////////////////////////////////////////////
> (gdb) directory /home/dingaaa/test/gdb-7.6/libiberty/
> Source directories searched: /home/dingaaa/test/gdb-7.6/libiberty:$cdir:$cwd
> ////////////////////////////////////////////
> 
> but still, I get
> ////////////////////////////////////////////
> (gdb) b getopt.c:100
> No source file named getopt.c.
> ////////////////////////////////////////////
> 
> BTW: I've changed Makefiles, with `-g -O0`
> 
> What's the problem?

You can only do this when debugging a program that has getopt.c
compiled in.  Since you give no details on how you built that program,
it's hard to say something more intelligent.