diff --git a/clang/cmake/caches/Fuchsia.cmake b/clang/cmake/caches/Fuchsia.cmake
--- a/clang/cmake/caches/Fuchsia.cmake
+++ b/clang/cmake/caches/Fuchsia.cmake
@@ -182,7 +182,8 @@
 foreach(variableName ${variableNames})
   if(variableName MATCHES "^STAGE2_")
     string(REPLACE "STAGE2_" "" new_name ${variableName})
-    list(APPEND EXTRA_ARGS "-D${new_name}=${${variableName}}")
+    string(REPLACE ";" "|" value "${${variableName}}")
+    list(APPEND EXTRA_ARGS "-D${new_name}=${value}")
   endif()
 endforeach()