diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1a0b2012e..64f9664bd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -419,8 +419,12 @@ else()
 endif()
 
 if(SIZE_T EQUAL UNSIGNED_LONG)
-  check_c_source_compiles("int main(int argc, char **argv) { unsigned long a = argc;  return __builtin_ctzl(a); }"
-    HAVE_BUILTIN_CTZL)
+  if ( XCODE )
+    set( HAVE_BUILTIN_CTZL ON )
+  else()
+    check_c_source_compiles("int main(int argc, char **argv) { unsigned long a = argc;  return __builtin_ctzl(a); }"
+      HAVE_BUILTIN_CTZL)
+  endif()
 endif()
 if(MSVC)
   check_include_files("intrin.h" HAVE_INTRIN_H)
@@ -468,14 +472,19 @@ if(FORCE_INLINE)
     list(INSERT INLINE_OPTIONS 0 "__inline__ __attribute__((always_inline))")
   endif()
 endif()
-foreach(inline ${INLINE_OPTIONS})
-  check_c_source_compiles("${inline} static int foo(void) { return 0; } int main(void) { return foo(); }"
-    INLINE_WORKS)
-  if(INLINE_WORKS)
-    set(INLINE ${inline})
-    break()
-  endif()
-endforeach()
+if ( NOT XCODE )
+  foreach(inline ${INLINE_OPTIONS})
+    check_c_source_compiles("${inline} static int foo(void) { return 0; } int main(void) { return foo(); }"
+      INLINE_WORKS)
+    if(INLINE_WORKS)
+      set(INLINE ${inline})
+      break()
+    endif()
+  endforeach()
+else()
+  set( INLINE_WORKS ON )
+  set( INLINE "inline" )
+endif()
 if(NOT INLINE_WORKS)
   message(FATAL_ERROR "Could not determine how to inline functions.")
 endif()