Date: Tue, 20 Oct 2015 10:27:37 -0700 From: John Baldwin <jhb@freebsd.org> To: Andriy Gapon <avg@freebsd.org> Cc: freebsd-toolchain@freebsd.org Subject: Re: clang confuses kgdb on static symbols Message-ID: <2309223.qpHU2DNGVF@ralph.baldwin.cx> In-Reply-To: <562627C8.5060108@FreeBSD.org> References: <562627C8.5060108@FreeBSD.org>
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On Tuesday, October 20, 2015 02:38:48 PM Andriy Gapon wrote:
>
> I see exactly the same behavior both kgdb and kgdb710 (devel/gdb with KGDB option):
> (kgdb) p/x intr_cpus
> No symbol "intr_cpus" in current context.
> (kgdb) p/x 'intr_cpus.0'
> $1 = 0xf
>
> Not sure if clang should try to not produce that '.0' suffix (especially given
> that there are no other intr_cpus symbols) or if kgdb should somehow figure out
> the suffix.
What if you disable the hack in sys/conf/kern.mk to use dwarf-2?
If '-gdwarf-4' works then you can just set that in the DEBUG makeoptions as a
test, otherwise try hacking kern.mk to disable this bit:
#
# Add -gdwarf-2 when compiling -g. The default starting in clang v3.4
# and gcc 4.8 is to generate DWARF version 4. However, our tools don't
# cope well with DWARF 4, so force it to genereate DWARF2, which they
# understand. Do this unconditionally as it is harmless when not needed,
# but critical for these newer versions.
#
.if ${CFLAGS:M-g} != "" && ${CFLAGS:M-gdwarf*} == ""
CFLAGS+= -gdwarf-2
.endif
--
John Baldwin
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