diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -938,7 +938,7 @@
     append("-fsanitize=fuzzer-no-link" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
   endif()
   if (LLVM_USE_SANITIZER MATCHES ".*Undefined.*")
-    set(IGNORELIST_FILE "${CMAKE_SOURCE_DIR}/utils/sanitizers/ubsan_ignorelist.txt")
+    set(IGNORELIST_FILE "${PROJECT_SOURCE_DIR}/utils/sanitizers/ubsan_ignorelist.txt")
     if (EXISTS "${IGNORELIST_FILE}")
       # Use this option name version since -fsanitize-ignorelist is only
       # accepted with clang 13.0 or newer.
diff --git a/llvm/include/llvm/TargetParser/CMakeLists.txt b/llvm/include/llvm/TargetParser/CMakeLists.txt
--- a/llvm/include/llvm/TargetParser/CMakeLists.txt
+++ b/llvm/include/llvm/TargetParser/CMakeLists.txt
@@ -1,4 +1,3 @@
-set(LLVM_TARGET_DEFINITIONS ${CMAKE_SOURCE_DIR}/lib/Target/RISCV/RISCV.td)
-tablegen(LLVM RISCVTargetParserDef.inc -gen-riscv-target-def -I ${CMAKE_SOURCE_DIR}/lib/Target/RISCV/)
+set(LLVM_TARGET_DEFINITIONS ${PROJECT_SOURCE_DIR}/lib/Target/RISCV/RISCV.td)
+tablegen(LLVM RISCVTargetParserDef.inc -gen-riscv-target-def -I ${PROJECT_SOURCE_DIR}/lib/Target/RISCV/)
 add_public_tablegen_target(RISCVTargetParserTableGen)
-
diff --git a/llvm/unittests/Target/PowerPC/CMakeLists.txt b/llvm/unittests/Target/PowerPC/CMakeLists.txt
--- a/llvm/unittests/Target/PowerPC/CMakeLists.txt
+++ b/llvm/unittests/Target/PowerPC/CMakeLists.txt
@@ -1,6 +1,6 @@
 include_directories(
-  ${CMAKE_SOURCE_DIR}/lib/Target/PowerPC
-  ${CMAKE_BINARY_DIR}/lib/Target/PowerPC
+  ${PROJECT_SOURCE_DIR}/lib/Target/PowerPC
+  ${PROJECT_BINARY_DIR}/lib/Target/PowerPC
   )
 
 set(LLVM_LINK_COMPONENTS
diff --git a/llvm/unittests/Target/WebAssembly/CMakeLists.txt b/llvm/unittests/Target/WebAssembly/CMakeLists.txt
--- a/llvm/unittests/Target/WebAssembly/CMakeLists.txt
+++ b/llvm/unittests/Target/WebAssembly/CMakeLists.txt
@@ -1,6 +1,6 @@
 include_directories(
-  ${CMAKE_SOURCE_DIR}/lib/Target/WebAssembly
-  ${CMAKE_BINARY_DIR}/lib/Target/WebAssembly
+  ${PROJECT_SOURCE_DIR}/lib/Target/WebAssembly
+  ${PROJECT_BINARY_DIR}/lib/Target/WebAssembly
   )
 
 set(LLVM_LINK_COMPONENTS
diff --git a/llvm/unittests/Target/X86/CMakeLists.txt b/llvm/unittests/Target/X86/CMakeLists.txt
--- a/llvm/unittests/Target/X86/CMakeLists.txt
+++ b/llvm/unittests/Target/X86/CMakeLists.txt
@@ -1,6 +1,6 @@
 include_directories(
-  ${CMAKE_SOURCE_DIR}/lib/Target/X86
-  ${CMAKE_BINARY_DIR}/lib/Target/X86
+  ${PROJECT_SOURCE_DIR}/lib/Target/X86
+  ${PROJECT_BINARY_DIR}/lib/Target/X86
   )
 
 set(LLVM_LINK_COMPONENTS