[llvm-dev] ubsan no longer compiles when libc++ is the default

[İsmail Dönmez via llvm-dev]

Hi,

Trying to compile llvm with the following configuration on Linux x86-64:

cmake -G Ninja -DBUILD_SHARED_LIBS=ON \
                          -DCMAKE_SHARED_LINKER_FLAGS="-fuse-ld=gold"
\
 -DCMAKE_EXE_LINKER_FLAGS="-fuse-ld=gold"\
                          -DCMAKE_BUILD_TYPE=RelWithDebInfo ' \
                          -DCMAKE_C_FLAGS="-O2 -g"  \
                          -DCMAKE_CXX_FLAGS="-O2 -g" \
                          -DENABLE_LINKER_BUILD_ID=ON \
                          -DLLVM_ENABLE_ASSERTIONS=ON \
                          -DLLVM_ENABLE_PIC=ON \
                          -DLLVM_BINUTILS_INCDIR=/usr/include \
                          -DLLVM_TARGETS_TO_BUILD=host \
                          -DLLVM_TARGET_ARCH=host \
                          -DLLVM_LIBDIR_SUFFIX=64 \
                          -DCLANG_DEFAULT_CXX_STDLIB=libc++ \
                          -DLLVM_ENABLE_LIBCXX=ON ..

results in the following build error:

../projects/compiler-rt/lib/ubsan/ubsan_type_hash_itanium.cc:233:
error: undefined reference to 'typeinfo for std::type_info'
../projects/compiler-rt/lib/ubsan/ubsan_type_hash_itanium.cc:233:
error: undefined reference to 'typeinfo for
__cxxabiv1::__class_type_info'
 ../projects/compiler-rt/lib/ubsan/ubsan_type_hash_itanium.cc:233:
error: undefined reference to '__dynamic_cast'
[...]

Looks like ubsan no longer links to libc++abi ? (I see -lgcc_s -lc
-ldl -lrt -lpthread on the linker line.)

This configuration has worked with r308719 so I am guessing this is a
regression.

Regards,
ismail