diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1533d1de7..117bc9dc5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -125,6 +125,11 @@ if (SOLARIS)
   endif (NSL_LIBRARY)
 endif (SOLARIS)
 
+# Disable the Clang return-type-c-linkage warning globally. See #3225.
+if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-return-type-c-linkage")
+endif (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
+
 message ("-- Configuring cmake.h")
 configure_file (
   ${CMAKE_SOURCE_DIR}/cmake.h.in