From https://ci.chromium.org/buildbot/chromium.clang/ToTAndroidCFI/1014:

[54315/56943] SOLINK ./lib_components_unittests__library.so
FAILED: lib_components_unittests__library.so lib_components_unittests__library.so.TOC lib.unstripped/lib_components_unittests__library.so 
python "../../build/toolchain/gcc_solink_wrapper.py" --readelf="../../third_party/android_ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-readelf" --nm="../../third_party/android_ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-nm" --strip=../../third_party/eu-strip/bin/eu-strip --sofile="./lib.unstripped/lib_components_unittests__library.so" --tocfile="./lib_components_unittests__library.so.TOC" --output="./lib_components_unittests__library.so"  -- ../../third_party/llvm-build/Release+Asserts/bin/clang++ -shared -fPIC -Wl,-z,noexecstack -Wl,-z,now -Wl,-z,relro --gcc-toolchain=../../third_party/android_ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64 -fuse-ld=lld -flto=thin -Wl,--thinlto-jobs=8 -Wl,--thinlto-cache-dir=thinlto-cache -Wl,--thinlto-cache-policy,cache_size=10\% -Wl,--lto-O0 -fwhole-program-vtables -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,--warn-shared-textrel -Wl,-O1 -Wl,--gc-sections -Wl,--fatal-warnings -nostdlib -Wl,--warn-shared-textrel --sysroot=../../third_party/android_ndk/platforms/android-16/arch-arm -fsanitize=cfi-vcall -fsanitize=cfi-derived-cast -fsanitize=cfi-unrelated-cast -fno-sanitize-trap=cfi -Wl,--version-script=/b/c/b/ToTAndroidCFI/src/build/android/android_only_jni_exports.lst -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 -Wl,--dynamic-linker,/system/bin/linker -L../../third_party/android_ndk/sources/cxx-stl/llvm-libc++/libs/armeabi-v7a -o "./lib.unstripped/lib_components_unittests__library.so" -Wl,-soname="lib_components_unittests__library.so" @"./lib_components_unittests__library.so.rsp"
/b/c/b/ToTAndroidCFI/src/out/Release/../../third_party/llvm-build/Release+Asserts/bin/ld.lld: error: linking module flags 'Dwarf Version': IDs have conflicting values
/b/c/b/ToTAndroidCFI/src/out/Release/../../third_party/llvm-build/Release+Asserts/bin/ld.lld: error: linking module flags 'Dwarf Version': IDs have conflicting values
/b/c/b/ToTAndroidCFI/src/out/Release/../../third_party/llvm-build/Release+Asserts/bin/ld.lld: error: linking module flags 'Dwarf Version': IDs have conflicting values
/b/c/b/ToTAndroidCFI/src/out/Release/../../third_party/llvm-build/Release+Asserts/bin/ld.lld: error: linking module flags 'Dwarf Version': IDs have conflicting values
/b/c/b/ToTAndroidCFI/src/out/Release/../../third_party/llvm-build/Release+Asserts/bin/ld.lld: error: linking module flags 'Dwarf Version': IDs have conflicting values
/b/c/b/ToTAndroidCFI/src/out/Release/../../third_party/llvm-build/Release+Asserts/bin/ld.lld: error: linking module flags 'Dwarf Version': IDs have conflicting values
/b/c/b/ToTAndroidCFI/src/out/Release/../../third_party/llvm-build/Release+Asserts/bin/ld.lld: error: linking module flags 'Dwarf Version': IDs have conflicting values
/b/c/b/ToTAndroidCFI/src/out/Release/../../third_party/llvm-build/Release+Asserts/bin/ld.lld: error: linking module flags 'Dwarf Version': IDs have conflicting values
/b/c/b/ToTAndroidCFI/src/out/Release/../../third_party/llvm-build/Release+Asserts/bin/ld.lld: error: linking module flags 'Dwarf Version': IDs have conflicting values
clang-7.0: error: linker command failed with exit code 1 (use -v to see invocation)


I couldn't find any green builds from this bot, so I assume it's not a clang blocker.