Date: Thu, 24 Feb 2011 10:50:07 +1100 (EST) From: Bruce Evans <brde@optusnet.com.au> To: Dimitry Andric <dim@FreeBSD.org> Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org, Bruce Evans <brde@optusnet.com.au> Subject: Re: svn commit: r218984 - head/lib/librt Message-ID: <20110224103713.I1871@besplex.bde.org> In-Reply-To: <4D658AD4.9020602@FreeBSD.org> References: <201102232117.p1NLHcuE011679@svn.freebsd.org> <20110224084812.F1571@besplex.bde.org> <20110224090558.E1571@besplex.bde.org> <4D658AD4.9020602@FreeBSD.org>
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On Wed, 23 Feb 2011, Dimitry Andric wrote:
> On 2011-02-23 23:13, Bruce Evans wrote:
>> Now found it easly using gcc -v. gcc -c -v foo.c produces "... /usr/bin/as
>> -o foo.o /var/tmp/whatever.s", but gcc -c -v foo.s produces "...
>> /usr/bin/as
>> -gdwarf2 -o foo.o foo.s". gcc's generation of -gdwarf2 is inconsistent
>> with itself. Do we use a nonstandard not-gdwarf2 option for the usual case
>> but forget to change this for asm files?
>
> I don't think so, but there is simply no need to pass '-g' in the gcc
> invocation that assembles and links the .s file, since the debug info is
> already embedded in the .s file itself.
Except I want to write "cc ${CFLAGS} -o foo *.s *.c [*.o]" and not have
variant ${CFLAGS} for *.s and *.c. It is a nice feature of cc that you
can use the same ${CFLAGS} for *.[cos...] in most contexts, and FreeBSD
.mk files depend on this.
> Apparently, if you use --gdwarf2 with GNU as 2.15, it messes up the
> already existing debug info. It looks like 2.17.50 has no such problem,
> though.
So we won't worry much about this. Does new binutils/as completely ignore
--gdwarf2 iff the asm file already has suitable debugging info? I would
have expected at least an error message if the debugging info says --gother
and you try to add or change to --gdwarf2. Normal debugging info doesn't
seem to have any id to distinguish its type.
Bruce
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