Date: Sun, 23 Jul 2017 21:16:26 -0400 From: Shawn Webb <shawn.webb@hardenedbsd.org> To: Mark Millard <markmi@dsl-only.net> Cc: FreeBSD Current <freebsd-current@freebsd.org>, Dimitry Andric <dim@FreeBSD.org> Subject: Re: HEADS-UP: Merged llvm/clang 5.0.0 into -CURRENT (as of r321369) Message-ID: <20170724011613.radyrjpsaqwjfc6t@mutt-hbsd> In-Reply-To: <20170723233447.3qqb7sbonlhirwt5@mutt-hbsd> References: <CBE9BADF-CE6D-4317-9868-945A0FDB65BE@dsl-only.net> <20170723233447.3qqb7sbonlhirwt5@mutt-hbsd>
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On Sun, Jul 23, 2017 at 07:34:47PM -0400, Shawn Webb wrote:
> On Sun, Jul 23, 2017 at 04:13:18PM -0700, Mark Millard wrote:
> > Shawn Webb shawn.webb at hardenedbsd.org wrote on
> > Sat Jul 22 15:33:14 UTC 2017 :
> >=20
> > > I haven't nailed down whether it's SafeStack, CFI, or using lld as the
> > > default linker, but it looks like we in HardenedBSD are getting an
> > > undefined symbol during buildworld.
> >=20
> > In an amd64 -> TARGET_ARCH=3Dpowerpc64 cross build context=20
> > for FreeBSD -r321371 I got a similar report for the:
> >=20
> > /usr/obj/usr/src/tmp/usr/bin/ld: error: undefined symbol: lldb_private:=
:AppleObjCRuntime::GetFoundationVersion()
> > >>> referenced by /usr/src/contrib/llvm/tools/lldb/source/Plugins/Langu=
age/ObjC/Cocoa.cpp
> > >>> Cocoa.o:(lldb_private::formatters::NSNumberSummaryPro=
vider(lldb_private::ValueObject&, lldb_private::Stream&, lldb_private::Type=
SummaryOptions const&)) in archive /usr/obj/usr/src/lib/clang/liblldb/libll=
db.a
> >=20
> > part of your report (logfile). The context used
> > devel/powerpc64-binutils :
> >=20
> > # /usr/local/powerpc64-freebsd/bin/ld --version
> > GNU ld (GNU Binutils) 2.28
> > Copyright (C) 2017 Free Software Foundation, Inc.
> > This program is free software; you may redistribute it under the terms =
of
> > the GNU General Public License version 3 or (at your option) a later ve=
rsion.
> > This program has absolutely no warranty.
> >=20
> > (lld is not yet working option for powerpc64 as
> > far as I know.)
> >=20
> > For this part of your report I doubt that anything
> > that you listed is required for the problem to happen.
> >=20
> > In my context the error text was:
> >=20
> > --- lldb.full ---
> > /usr/obj/powerpc64vtsc_clang_altbinutils/powerpc.powerpc64/usr/src/lib/=
clang/liblldb/liblldb.a(Cocoa.o): In function `lldb_private::formatters::NS=
NumberSummaryProvider(lldb_private::ValueObject&, lldb_private::Stream&, ll=
db_private::TypeSummaryOptions const&)':
> > /usr/src/contrib/llvm/tools/lldb/source/Plugins/Language/ObjC/Cocoa.cpp=
:(.text._ZN12lldb_private10formatters23NSNumberSummaryProviderERNS_11ValueO=
bjectERNS_6StreamERKNS_18TypeSummaryOptionsE+0x398): undefined reference to=
`lldb_private::AppleObjCRuntime::GetFoundationVersion()'
>=20
> Hey Mark,
>=20
> I wasn't doing a cross-build, but rather a native build for amd64. I'm
> getting errors again. In fact, I'm getting the same error you just
> posted above. I have no clue why the error's happening. That you're
> also getting the error shows that the issue isn't specific to
> HardenedBSD at the very least.
I've figured out how to fully reproduce. The following assumes world
still is at clang/llvm 4.0. The following also assumes the source tree
is at /usr/src and is latest FreeBSD HEAD. And MAKEOBJDIRPREFIX is unset
or left as default. Native build on amd64.
1. Set ld.lld as the linker:
a. rm /usr/bin/ld
b. ln -s ld.lld /usr/bin/ld
c. Verify: `ld -version` should show:
LLD 4.0.0 (FreeBSD 297347) (compatible with GNU linkers)
2. Ensure the object tree is clean:
a. rm -rf /usr/obj/usr/src
3. Build world:
a. make -sj$(sysctl -n hw.ncpu) buildworld
4. Relax, grab a drink, eat some Skittles
5. Come back to buildworld failing to link lldb.full in
usr.bin/clang/lldb
Thanks,
--=20
Shawn Webb
Cofounder and Security Engineer
HardenedBSD
GPG Key ID: 0x6A84658F52456EEE
GPG Key Fingerprint: 2ABA B6BD EF6A F486 BE89 3D9E 6A84 658F 5245 6EEE
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