Set LLVM_TOOL_COMPILER_RT_BUILD to build compiler-rt

Author: vedantk

utils/build-script-impl

@@ -483,12 +483,14 @@ function set_deployment_target_based_options() {
                     ;;
             esac
 
+	    echo "num deployment targets = ${#CROSS_COMPILE_TOOLS_DEPLOYMENT_TARGETS[@]}"
+
             llvm_cmake_options=(
                 -DCMAKE_OSX_DEPLOYMENT_TARGET:STRING="${cmake_osx_deployment_target}"
                 -DCMAKE_OSX_SYSROOT:PATH="$(xcrun --sdk ${xcrun_sdk_name} --show-sdk-path)"
                 -DLLVM_HOST_TRIPLE:STRING="${llvm_host_triple}"
                 -DLLVM_ENABLE_LIBCXX:BOOL=TRUE
-                -DLLVM_BUILD_EXTERNAL_COMPILER_RT:BOOL="$(true_false ${#CROSS_COMPILE_TOOLS_DEPLOYMENT_TARGETS[@]})"
+                -DLLVM_TOOL_COMPILER_RT_BUILD:BOOL="$(false_true ${#CROSS_COMPILE_TOOLS_DEPLOYMENT_TARGETS[@]})"
                 -DCOMPILER_RT_ENABLE_IOS:BOOL="$(false_true ${SKIP_IOS})"
                 -DCOMPILER_RT_ENABLE_WATCHOS:BOOL=FALSE
                 -DCOMPILER_RT_ENABLE_TVOS:BOOL=FALSE
@@ -810,7 +812,11 @@ function true_false() {
 }
 
 function false_true() {
-    true_false $(not "$1")
+    if [[ $(true_false "$1") = "TRUE" ]]; then
+        echo "FALSE"
+    else
+        echo "TRUE"
+    fi
 }
 
 function cmake_version() {