[cmake] Expose the dependencies of ExecutionEngine as PUBLIC

Expose the dependencies of LLVMExecutionEngine library as PUBLIC rather than PRIVATE when building a shared library. This is necessary because the library is not contained but exposes API of other LLVM libraries via its headers. This causes other libraries to fail to link if the linker verifies for correctness of -l flags (i.e. fails on indirect dependencies). This e.g. happens when building LLDB against shared LLVM: lib64/liblldbExpression.a(IRExecutionUnit.cpp.o):(.data.rel.ro._ZTIN4llvm18MCJITMemoryManagerE[_ZTIN4llvm18MCJITMemoryManagerE]+0x10): undefined reference to `typeinfo for llvm::RuntimeDyld::MemoryManager' lib64/liblldbExpression.a(IRExecutionUnit.cpp.o):(.data.rel.ro._ZTVN4llvm18MCJITMemoryManagerE[_ZTVN4llvm18MCJITMemoryManagerE]+0x60): undefined reference to `llvm::RuntimeDyld::MemoryManager::anchor()' lib64/liblldbExpression.a(IRExecutionUnit.cpp.o):(.data.rel.ro._ZTVN12lldb_private15IRExecutionUnit13MemoryManagerE[_ZTVN12lldb_private15IRExecutionUnit13MemoryManagerE]+0x48): undefined reference to `llvm::RTDyldMemoryManager::deregisterEHFrames()' lib64/liblldbExpression.a(IRExecutionUnit.cpp.o):(.data.rel.ro._ZTVN12lldb_private15IRExecutionUnit13MemoryManagerE[_ZTVN12lldb_private15IRExecutionUnit13MemoryManagerE]+0x60): undefined reference to `llvm::RuntimeDyld::MemoryManager::anchor()' lib64/liblldbExpression.a(IRExecutionUnit.cpp.o):(.data.rel.ro._ZTVN12lldb_private15IRExecutionUnit13MemoryManagerE[_ZTVN12lldb_private15IRExecutionUnit13MemoryManagerE]+0xd0): undefined reference to `llvm::JITSymbolResolver::anchor()' collect2: error: ld returned 1 exit status Declaring the dependencies as PUBLIC guarantees that any package using the ExecutionEngine library will also get explicit -l flags for the dependent libraries guaranteeing that the symbols exposed in headers could be resolved. Patch originally written by NAKAMURA Takumi. Differential Revision: https://reviews.llvm.org/D36211 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310712 91177308-0d34-0410-b5e6-96231b3b80d8

Author: mgorny

lib/ExecutionEngine/CMakeLists.txt

@@ -14,6 +14,10 @@ add_llvm_library(LLVMExecutionEngine
  intrinsics_gen
  )
 
+if(BUILD_SHARED_LIBS)
+ target_link_libraries(LLVMExecutionEngine PUBLIC LLVMRuntimeDyld)
+endif()
+
 add_subdirectory(Interpreter)
 add_subdirectory(MCJIT)
 add_subdirectory(Orc)