Index: cmake/Modules/AddCompilerRT.cmake
===================================================================
--- cmake/Modules/AddCompilerRT.cmake
+++ cmake/Modules/AddCompilerRT.cmake
@@ -165,7 +165,10 @@
   endif()
 endfunction()
 
-set(COMPILER_RT_TEST_CFLAGS)
+# when cross compiling, COMPILER_RT_TEST_COMPILER_CFLAGS help
+# in compilation and linking of unittests.
+string(REPLACE " " ";" COMPILER_RT_UNITTEST_CFLAGS "${COMPILER_RT_TEST_COMPILER_CFLAGS}")
+set(COMPILER_RT_UNITTEST_LINKFLAGS ${COMPILER_RT_UNITTEST_CFLAGS})
 
 # Unittests support.
 set(COMPILER_RT_GTEST_PATH ${LLVM_MAIN_SRC_DIR}/utils/unittest/googletest)
@@ -177,14 +180,14 @@
   -I${COMPILER_RT_GTEST_PATH}
 )
 
-append_list_if(COMPILER_RT_DEBUG -DSANITIZER_DEBUG=1 COMPILER_RT_TEST_CFLAGS)
+append_list_if(COMPILER_RT_DEBUG -DSANITIZER_DEBUG=1 COMPILER_RT_UNITTEST_CFLAGS)
 
 if(MSVC)
   # clang doesn't support exceptions on Windows yet.
-  list(APPEND COMPILER_RT_TEST_CFLAGS -D_HAS_EXCEPTIONS=0)
+  list(APPEND COMPILER_RT_UNITTEST_CFLAGS -D_HAS_EXCEPTIONS=0)
 
   # We should teach clang to understand "#pragma intrinsic", see PR19898.
-  list(APPEND COMPILER_RT_TEST_CFLAGS -Wno-undefined-inline)
+  list(APPEND COMPILER_RT_UNITTEST_CFLAGS -Wno-undefined-inline)
 
   # Clang doesn't support SEH on Windows yet.
   list(APPEND COMPILER_RT_GTEST_CFLAGS -DGTEST_HAS_SEH=0)
Index: lib/asan/tests/CMakeLists.txt
===================================================================
--- lib/asan/tests/CMakeLists.txt
+++ lib/asan/tests/CMakeLists.txt
@@ -21,7 +21,7 @@
   asan_test_utils.h)
 
 set(ASAN_UNITTEST_COMMON_CFLAGS
-  ${COMPILER_RT_TEST_CFLAGS}
+  ${COMPILER_RT_UNITTEST_CFLAGS}
   ${COMPILER_RT_GTEST_CFLAGS}
   -I${COMPILER_RT_SOURCE_DIR}/include
   -I${COMPILER_RT_SOURCE_DIR}/lib
@@ -34,6 +34,11 @@
   -Wno-non-virtual-dtor)
 append_list_if(COMPILER_RT_HAS_WVARIADIC_MACROS_FLAG -Wno-variadic-macros ASAN_UNITTEST_COMMON_CFLAGS)
 
+# This will ensure the target linker is used
+# during cross compilation
+set(ASAN_UNITTEST_COMMON_LINKFLAGS
+  ${COMPILER_RT_UNITTEST_LINKFLAGS})
+
 # -gline-tables-only must be enough for ASan, so use it if possible.
 if(COMPILER_RT_TEST_COMPILER_ID MATCHES "Clang")
   list(APPEND ASAN_UNITTEST_COMMON_CFLAGS -gline-tables-only)
Index: lib/msan/tests/CMakeLists.txt
===================================================================
--- lib/msan/tests/CMakeLists.txt
+++ lib/msan/tests/CMakeLists.txt
@@ -20,7 +20,7 @@
 set(MSAN_UNITTEST_COMMON_CFLAGS
   -nostdinc++
   -isystem ${COMPILER_RT_LIBCXX_PATH}/include
-  ${COMPILER_RT_TEST_CFLAGS}
+  ${COMPILER_RT_UNITTEST_CFLAGS}
   ${COMPILER_RT_GTEST_CFLAGS}
   -I${COMPILER_RT_SOURCE_DIR}/include
   -I${COMPILER_RT_SOURCE_DIR}/lib
Index: lib/sanitizer_common/tests/CMakeLists.txt
===================================================================
--- lib/sanitizer_common/tests/CMakeLists.txt
+++ lib/sanitizer_common/tests/CMakeLists.txt
@@ -44,7 +44,7 @@
 endforeach()
 
 set(SANITIZER_TEST_CFLAGS_COMMON
-  ${COMPILER_RT_TEST_CFLAGS}
+  ${COMPILER_RT_UNITTEST_CFLAGS}
   ${COMPILER_RT_GTEST_CFLAGS}
   -I${COMPILER_RT_SOURCE_DIR}/include
   -I${COMPILER_RT_SOURCE_DIR}/lib
Index: lib/tsan/tests/CMakeLists.txt
===================================================================
--- lib/tsan/tests/CMakeLists.txt
+++ lib/tsan/tests/CMakeLists.txt
@@ -6,7 +6,7 @@
 
 set(TSAN_UNITTEST_CFLAGS
   ${TSAN_CFLAGS}
-  ${COMPILER_RT_TEST_CFLAGS}
+  ${COMPILER_RT_UNITTEST_CFLAGS}
   ${COMPILER_RT_GTEST_CFLAGS}
   -I${COMPILER_RT_SOURCE_DIR}/lib
   -I${COMPILER_RT_SOURCE_DIR}/lib/tsan/rtl