diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1f7dd57..6170fde 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -630,22 +630,26 @@
 endfunction()
 
 # Exception flags =============================================================
-if (LIBCXX_ENABLE_EXCEPTIONS)
-  # Catches C++ exceptions only and tells the compiler to assume that extern C
-  # functions never throw a C++ exception.
-  add_compile_flags_if_supported(-EHsc)
-else()
-  add_definitions(-D_LIBCPP_NO_EXCEPTIONS)
-  add_compile_flags_if_supported(-EHs- -EHa-)
-  add_compile_flags_if_supported(-fno-exceptions)
-endif()
+function(cxx_add_exception_flags target)
+  if (LIBCXX_ENABLE_EXCEPTIONS)
+    # Catches C++ exceptions only and tells the compiler to assume that extern C
+    # functions never throw a C++ exception.
+    target_add_compile_flags_if_supported(${target} PUBLIC -EHsc)
+  else()
+    target_compile_definitions(${target} PUBLIC -D_LIBCPP_NO_EXCEPTIONS)
+    target_add_compile_flags_if_supported(${target} PUBLIC -EHs- -EHa-)
+    target_add_compile_flags_if_supported(${target} PUBLIC -fno-exceptions)
+  endif()
+endfunction()
 
 # RTTI flags ==================================================================
-if (NOT LIBCXX_ENABLE_RTTI)
-  add_definitions(-D_LIBCPP_NO_RTTI)
-  add_compile_flags_if_supported(-GR-)
-  add_compile_flags_if_supported(-fno-rtti)
-endif()
+function(cxx_add_rtti_flags target)
+  if (NOT LIBCXX_ENABLE_RTTI)
+    target_compile_definitions(${target} PUBLIC -D_LIBCPP_NO_RTTI)
+    target_add_compile_flags_if_supported(${target} PUBLIC -GR-)
+    target_add_compile_flags_if_supported(${target} PUBLIC -fno-rtti)
+  endif()
+endfunction()
 
 # Threading flags =============================================================
 if (LIBCXX_BUILD_EXTERNAL_THREAD_LIBRARY AND LIBCXX_ENABLE_SHARED)
@@ -672,11 +676,13 @@
 # FIXME The libc++ sources are fundamentally non-modular. They need special
 # versions of the headers in order to provide C++03 and legacy ABI definitions.
 # NOTE: The public headers can be used with modules in all other contexts.
-if (LLVM_ENABLE_MODULES)
-  # Ignore that the rest of the modules flags are now unused.
-  add_compile_flags_if_supported(-Wno-unused-command-line-argument)
-  add_compile_flags(-fno-modules)
-endif()
+function(cxx_add_module_flags target)
+  if (LLVM_ENABLE_MODULES)
+    # Ignore that the rest of the modules flags are now unused.
+    target_add_compile_flags_if_supported(${target} PRIVATE -Wno-unused-command-line-argument)
+    target_compile_options(${target} PRIVATE -fno-modules)
+  endif()
+endfunction()
 
 # Sanitizer flags =============================================================
 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 93d48f1..d0a5108 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -235,6 +235,9 @@
   cxx_add_warning_flags(cxx_shared)
   cxx_add_windows_flags(cxx_shared)
   cxx_add_config_site(cxx_shared)
+  cxx_add_exception_flags(cxx_shared)
+  cxx_add_rtti_flags(cxx_shared)
+  cxx_add_module_flags(cxx_shared)
 
   # Link against LLVM libunwind
   if (LIBCXXABI_USE_LLVM_UNWINDER)
@@ -339,6 +342,9 @@
   cxx_add_warning_flags(cxx_static)
   cxx_add_windows_flags(cxx_static)
   cxx_add_config_site(cxx_static)
+  cxx_add_exception_flags(cxx_static)
+  cxx_add_rtti_flags(cxx_static)
+  cxx_add_module_flags(cxx_static)
 
   if (LIBCXX_HERMETIC_STATIC_LIBRARY)
     # If the hermetic library doesn't define the operator new/delete functions