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

[Vedant Kumar via llvm-dev]

> On Aug 1, 2017, at 7:07 AM, İsmail Dönmez via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> 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.

This might have done it:
r309362 Support libc++abi in addition to libstdc++

Can you spot SANITIZER_CXX_ABI_LIBRARY, SANITIZER_CXX_ABI_LIBNAME, SANITIZER_CXX_ABI_INTREE, and SANITIZER_CXX_ABI_SYSTEM in your CMakeCache.txt? If so do they have the right values?

vedant

> 
> Regards,
> ismail
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