Index: compiler-rt/cmake/Modules/AddCompilerRT.cmake
===================================================================
--- compiler-rt/cmake/Modules/AddCompilerRT.cmake
+++ compiler-rt/cmake/Modules/AddCompilerRT.cmake
@@ -77,6 +77,17 @@
       list(REMOVE_ITEM target_flags "-msse3")
     endif()
 
+    # Build the macOS sanitizers with Mac Catalyst support.
+    if (APPLE AND
+        "${COMPILER_RT_ENABLE_MACCATALYST}" AND
+        "${libname}" MATCHES ".*\.osx.*")
+      foreach(arch ${LIB_ARCHS_${libname}})
+        list(APPEND target_flags
+          -target ${arch}-apple-macos${DARWIN_osx_MIN_VER}
+          -darwin-target-variant ${arch}-apple-ios13.1-macabi)
+      endforeach()
+    endif()
+
     set_target_compile_flags(${libname}
       ${extra_cflags_${libname}} ${target_flags})
     set_property(TARGET ${libname} APPEND PROPERTY
@@ -225,6 +236,21 @@
         set(extra_link_flags_${libname} ${DARWIN_${os}_LINK_FLAGS} ${LIB_LINK_FLAGS})
       endif()
       list_intersect(LIB_ARCHS_${libname} DARWIN_${os}_ARCHS LIB_ARCHS)
+
+      # Build the macOS sanitizers with Mac Catalyst support.
+      if (APPLE AND
+          "${COMPILER_RT_ENABLE_MACCATALYST}" AND
+          "${os}" MATCHES "^(osx)$")
+        foreach(arch ${LIB_ARCHS_${libname}})
+          list(APPEND LIB_CFLAGS
+            -target ${arch}-apple-macos${DARWIN_osx_MIN_VER}
+            -darwin-target-variant ${arch}-apple-ios13.1-macabi)
+          list(APPEND extra_link_flags_${libname}
+            -target ${arch}-apple-macos${DARWIN_osx_MIN_VER}
+            -darwin-target-variant ${arch}-apple-ios13.1-macabi)
+        endforeach()
+      endif()
+
       if(LIB_ARCHS_${libname})
         list(APPEND libnames ${libname})
         set(extra_cflags_${libname} ${DARWIN_${os}_CFLAGS} ${NO_LTO_FLAGS} ${NO_PGO_FLAGS} ${LIB_CFLAGS})