CMake: Fix LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING in reentrancy situation

Author: penguin-wwy

llvm/cmake/modules/HandleLLVMOptions.cmake

@@ -198,17 +198,21 @@ endif()
 
 string(TOUPPER "${LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING}" uppercase_LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING)
 
-if( uppercase_LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING STREQUAL "COVERAGE" )
-  set( LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING 1 )
-elseif( uppercase_LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING STREQUAL "COVERAGE_AND_ORIGIN" )
-  set( LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING 1 )
-  set( LLVM_ENABLE_DEBUGLOC_ORIGIN_TRACKING 1 )
-elseif( uppercase_LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING STREQUAL "DISABLED" OR NOT DEFINED LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING )
-  # The DISABLED setting is default.
-  set( LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING 0 )
-else()
-  message(FATAL_ERROR "Unknown value for LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING: \"${LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING}\"!")
-endif()
+if( NOT ${LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING} EQUAL 0
+      AND NOT ${LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING} EQUAL 1 )
+  string(TOUPPER "${LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING}" uppercase_LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING)
+  if( uppercase_LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING STREQUAL "COVERAGE" )
+    set( LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING 1 )
+  elseif( uppercase_LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING STREQUAL "COVERAGE_AND_ORIGIN" )
+    set( LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING 1 )
+    set( LLVM_ENABLE_DEBUGLOC_ORIGIN_TRACKING 1 )
+  elseif( uppercase_LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING STREQUAL "DISABLED" OR NOT DEFINED LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING )
+    # The DISABLED setting is default.
+    set( LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING 0 )
+  else()
+    message(FATAL_ERROR "Unknown value for LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING: \"${LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING}\"!")
+  endif()
+endif ()
 # LLVM_ENABLE_DEBUGLOC_COVERAGE_TRACKING (non-cached) is expected to be
 # 1 or 0 here, assuming referenced in #cmakedefine01.