diff --git a/llvm/include/llvm/Config/llvm-config.h.cmake b/llvm/include/llvm/Config/llvm-config.h.cmake
--- a/llvm/include/llvm/Config/llvm-config.h.cmake
+++ b/llvm/include/llvm/Config/llvm-config.h.cmake
@@ -103,4 +103,7 @@
 /* Define if the xar_open() function is supported on this platform. */
 #cmakedefine LLVM_HAVE_LIBXAR ${LLVM_HAVE_LIBXAR}
 
+/* Define if building libLLVM shared library */
+#cmakedefine LLVM_BUILD_LLVM_DYLIB
+
 #endif
diff --git a/llvm/include/llvm/Support/Compiler.h b/llvm/include/llvm/Support/Compiler.h
--- a/llvm/include/llvm/Support/Compiler.h
+++ b/llvm/include/llvm/Support/Compiler.h
@@ -121,12 +121,16 @@
 /// On PE/COFF targets, library visibility is the default, so this isn't needed.
 ///
 /// LLVM_EXTERNAL_VISIBILITY - classes, functions, and variables marked with
-/// this attribute will be made public and visible outside of any shared library
-/// they are linked in to.
+/// this attribute will be made public and visible outside the libLLVM dynamic
+/// library.
 #if __has_attribute(visibility) && !defined(__MINGW32__) &&                    \
     !defined(__CYGWIN__) && !defined(_WIN32)
 #define LLVM_LIBRARY_VISIBILITY __attribute__ ((visibility("hidden")))
-#define LLVM_EXTERNAL_VISIBILITY __attribute__ ((visibility("default")))
+#if defined(LLVM_BUILD_LLVM_DYLIB)
+#define LLVM_EXTERNAL_VISIBILITY __attribute__((visibility("default")))
+#else
+#define LLVM_EXTERNAL_VISIBILITY
+#endif
 #else
 #define LLVM_LIBRARY_VISIBILITY
 #define LLVM_EXTERNAL_VISIBILITY