My Clank android_full_debug build has been broken for the last few days with the following error in linking:

[2/30] SOLINK ./libchrome.cr.so
FAILED: libchrome.cr.so libchrome.cr.so.TOC lib.unstripped/libchrome.cr.so 
python "../../build/toolchain/gcc_solink_wrapper.py" --readelf="../../third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-readelf" --nm="../../third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-nm" --strip=../../third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-strip --sofile="./lib.unstripped/libchrome.cr.so" --tocfile="./libchrome.cr.so.TOC" --output="./libchrome.cr.so"  -- ../../third_party/llvm-build/Release+Asserts/bin/clang++ -shared -Wl,--fatal-warnings -fPIC -Wl,-z,noexecstack -Wl,-z,now -Wl,-z,relro -Wl,-z,defs -Wl,--as-needed --gcc-toolchain=../../third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64 -fuse-ld=gold -Wl,--icf=all -Wl,--no-undefined -Wl,--exclude-libs=libgcc.a -Wl,--exclude-libs=libc++_static.a -Wl,--exclude-libs=libvpx_assembly_arm.a --target=arm-linux-androideabi -Werror -Wl,--gdb-index -nostdlib -Wl,--warn-shared-textrel --sysroot=../../third_party/android_tools/ndk/platforms/android-16/arch-arm -Wl,--version-script=/home/bokan/chrome/src/build/android/android_only_explicit_jni_exports.lst -Wl,-section-ordering-file=../../clank/orderfiles/orderfile.arm.out -Wl,-wrap,calloc -Wl,-wrap,free -Wl,-wrap,malloc -Wl,-wrap,memalign -Wl,-wrap,posix_memalign -Wl,-wrap,pvalloc -Wl,-wrap,realloc -Wl,-wrap,valloc -L../../third_party/android_tools/ndk/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a -o "./lib.unstripped/libchrome.cr.so" -Wl,-soname="libchrome.cr.so" @"./libchrome.cr.so.rsp"
../../device/vr/android/gvr/gvr_delegate_provider.h:0: error: undefined reference to 'vtable for device::GvrDelegateProvider'
../../third_party/android_tools/ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld.gold: the vtable symbol may be undefined because the class is missing its key function (see go/missingkeymethod)
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

Here are my `gn args`:

target_os = "android"
target_cpu = "arm"
is_debug = true
symbol_level = 2 
android_full_debug = true
is_component_build = true
is_clang = true
use_goma = true
goma_dir = "/home/bokan/tools/goma"
enable_incremental_javac = true
disable_incremental_isolated_processes = true

A release build works ok.