feat: respect cmake PIC setting in LLVM build

Author: simonresch

CMakeLists.txt

@@ -12,7 +12,6 @@ endif()
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
-# set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 set(CMAKE_BUILD_TYPE Release)
 
 set(LLVM_PROJECT_TARGET external.llvm-project)
@@ -40,7 +39,7 @@ ExternalProject_Add(${LLVM_PROJECT_TARGET}
         -DCMAKE_POSITION_INDEPENDENT_CODE=${CMAKE_POSITION_INDEPENDENT_CODE}
         -DLLVM_ENABLE_PROJECTS=clang
         -DLLVM_ENABLE_RTTI=ON
-        -DLLVM_ENABLE_PIC=OFF
+        -DLLVM_ENABLE_PIC=${CMAKE_POSITION_INDEPENDENT_CODE}
         -DLLVM_TARGETS_TO_BUILD=${LLVM_TARGETS_TO_BUILD}
         -DLLVM_BUILD_TOOLS=OFF
         -DLLVM_BUILD_TESTS=OFF