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 : > > > > > 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. > > > > In an amd64 -> TARGET_ARCH=powerpc64 cross build context > > for FreeBSD -r321371 I got a similar report for the: > > > > /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/Language/ObjC/Cocoa.cpp > > >>> > > >>> Cocoa.o:(lldb_private::formatters::NSNumberSummaryProvider(lldb_private::ValueObject&, > > >>> lldb_private::Stream&, lldb_private::TypeSummaryOptions const&)) in > > >>> archive /usr/obj/usr/src/lib/clang/liblldb/liblldb.a > > > > part of your report (logfile). The context used > > devel/powerpc64-binutils : > > > > # /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 > > version. > > This program has absolutely no warranty. > > > > (lld is not yet working option for powerpc64 as > > far as I know.) > > > > For this part of your report I doubt that anything > > that you listed is required for the problem to happen. > > > > In my context the error text was: > > > > --- lldb.full --- > > /usr/obj/powerpc64vtsc_clang_altbinutils/powerpc.powerpc64/usr/src/lib/clang/liblldb/liblldb.a(Cocoa.o): > > In function > > `lldb_private::formatters::NSNumberSummaryProvider(lldb_private::ValueObject&, > > lldb_private::Stream&, lldb_private::TypeSummaryOptions const&)': > > /usr/src/contrib/llvm/tools/lldb/source/Plugins/Language/ObjC/Cocoa.cpp:(.text._ZN12lldb_private10formatters23NSNumberSummaryProviderERNS_11ValueObjectERNS_6StreamERKNS_18TypeSummaryOptionsE+0x398): > > undefined reference to > > `lldb_private::AppleObjCRuntime::GetFoundationVersion()' > > Hey Mark, > > 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, -- 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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