[ 53%] Linking CXX executable test_function_dag
/bin/ld: ../../libHalide.so.10.0.0: undefined reference to `typeinfo for llvm::SectionMemoryManager'
collect2: error: ld returned 1 exit status
make[2]: *** [src/autoschedulers/adams2019/CMakeFiles/test_function_dag.dir/build.make:134: src/autoschedulers/adams2019/test_function_dag] Error 1
make[1]: *** [CMakeFiles/Makefile2:2328: src/autoschedulers/adams2019/CMakeFiles/test_function_dag.dir/all] Error 2
make: *** [Makefile:182: all] Error 2
I'm using pre-built LLVM binaries and below cmake command to configure
cmake -DCMAKE_BUILD_TYPE=Release -DLLVM_DIR=/home/harry/llvm/lib/cmake/llvm ../
Any advice and suggestions will be greatly appreciated.
I cloned Halide from release/10.x, and compiled against the LLVM 10.0.0 binaries obtained here. On Ubuntu 20.04 LTS, I had to also apt install libtinfo5 because these binaries are built against old system libraries.
I noticed that the official binaries are not built with RTTI enabled (ugh) and was able to repro and fix. There's a bug in dependencies/llvm/CMakeLists.txt. Find the line that reads:
$<$<COMPILE_LANG_AND_ID:CXX,GCC,Clang,AppleClang>:-fno-rtti>)
and change GCC to GNU. We don't test with non-RTTI LLVM, which is why this wasn't caught.