diff --git a/compiler-rt/cmake/config-ix.cmake b/compiler-rt/cmake/config-ix.cmake
index a1f8a200ef3be9..c0841c2383e078 100644
--- a/compiler-rt/cmake/config-ix.cmake
+++ b/compiler-rt/cmake/config-ix.cmake
@@ -137,19 +137,19 @@ check_cxx_compiler_flag(/wd4391 COMPILER_RT_HAS_WD4391_FLAG)
 check_cxx_compiler_flag(/wd4722 COMPILER_RT_HAS_WD4722_FLAG)
 check_cxx_compiler_flag(/wd4800 COMPILER_RT_HAS_WD4800_FLAG)
 
-check_cxx_compiler_flag(-Warray-bounds COMPILER_RT_HAS_ARRAY_BOUNDS_FLAG)
-check_cxx_compiler_flag(-Wuninitialized COMPILER_RT_HAS_UNINITIALIZED_FLAG)
-check_cxx_compiler_flag(-Wshadow COMPILER_RT_HAS_SHADOW_FLAG)
-check_cxx_compiler_flag(-Wempty-body COMPILER_RT_HAS_EMPTY_BODY_FLAG)
-check_cxx_compiler_flag(-Wsizeof-pointer-memaccess COMPILER_RT_HAS_SIZEOF_POINTER_MEMACCESS_FLAG)
-check_cxx_compiler_flag(-Wsizeof-array-argument COMPILER_RT_HAS_SIZEOF_ARRAY_ARGUMENT_FLAG)
-check_cxx_compiler_flag(-Wmemset-transposed-args COMPILER_RT_HAS_MEMSET_TRANSPOSED_ARGS_FLAG)
-check_cxx_compiler_flag(-Wbuiltin-memcpy-chk-size COMPILER_RT_HAS_BUILTIN_MEMCPY_CHK_SIZE_FLAG)
-check_cxx_compiler_flag(-Warray-bounds-pointer-arithmetic COMPILER_RT_HAS_ARRAY_BOUNDS_POINTER_ARITHMETIC_FLAG)
-check_cxx_compiler_flag(-Wreturn-stack-address COMPILER_RT_HAS_RETURN_STACK_ADDRESS_FLAG)
-check_cxx_compiler_flag(-Wsizeof-array-decay COMPILER_RT_HAS_SIZEOF_ARRAY_DECAY_FLAG)
-check_cxx_compiler_flag(-Wformat-insufficient-args COMPILER_RT_HAS_FORMAT_INSUFFICIENT_ARGS_FLAG)
-check_cxx_compiler_flag(-Wformat-security COMPILER_RT_HAS_BUILTIN_FORMAL_SECURITY_FLAG)
+check_cxx_compiler_flag(-Werror -Warray-bounds COMPILER_RT_HAS_ARRAY_BOUNDS_FLAG)
+check_cxx_compiler_flag(-Werror -Wuninitialized COMPILER_RT_HAS_UNINITIALIZED_FLAG)
+check_cxx_compiler_flag(-Werror -Wshadow COMPILER_RT_HAS_SHADOW_FLAG)
+check_cxx_compiler_flag(-Werror -Wempty-body COMPILER_RT_HAS_EMPTY_BODY_FLAG)
+check_cxx_compiler_flag(-Werror -Wsizeof-pointer-memaccess COMPILER_RT_HAS_SIZEOF_POINTER_MEMACCESS_FLAG)
+check_cxx_compiler_flag(-Werror -Wsizeof-array-argument COMPILER_RT_HAS_SIZEOF_ARRAY_ARGUMENT_FLAG)
+check_cxx_compiler_flag(-Werror -Wmemset-transposed-args COMPILER_RT_HAS_MEMSET_TRANSPOSED_ARGS_FLAG)
+check_cxx_compiler_flag(-Werror -Wbuiltin-memcpy-chk-size COMPILER_RT_HAS_BUILTIN_MEMCPY_CHK_SIZE_FLAG)
+check_cxx_compiler_flag(-Werror -Warray-bounds-pointer-arithmetic COMPILER_RT_HAS_ARRAY_BOUNDS_POINTER_ARITHMETIC_FLAG)
+check_cxx_compiler_flag(-Werror -Wreturn-stack-address COMPILER_RT_HAS_RETURN_STACK_ADDRESS_FLAG)
+check_cxx_compiler_flag(-Werror -Wsizeof-array-decay COMPILER_RT_HAS_SIZEOF_ARRAY_DECAY_FLAG)
+check_cxx_compiler_flag(-Werror -Wformat-insufficient-args COMPILER_RT_HAS_FORMAT_INSUFFICIENT_ARGS_FLAG)
+check_cxx_compiler_flag(-Werror -Wformat-security COMPILER_RT_HAS_BUILTIN_FORMAL_SECURITY_FLAG)
 
 # Symbols.
 check_symbol_exists(__func__ "" COMPILER_RT_HAS_FUNC_SYMBOL)