Index: include/CMakeLists.txt
===================================================================
--- include/CMakeLists.txt
+++ include/CMakeLists.txt
@@ -1,4 +1,7 @@
 if (COMPILER_RT_BUILD_SANITIZERS)
+  set(GCOV_COMPAT_HEADERS
+    gcov.h)
+
   set(SANITIZER_HEADERS
     sanitizer/allocator_interface.h
     sanitizer/asan_interface.h
@@ -20,6 +23,7 @@
 endif(COMPILER_RT_BUILD_XRAY)
 
 set(COMPILER_RT_HEADERS
+  ${GCOV_COMPAT_HEADERS}
   ${SANITIZER_HEADERS}
 	${XRAY_HEADERS})
 
@@ -41,6 +45,10 @@
 add_dependencies(compiler-rt compiler-rt-headers)
 set_target_properties(compiler-rt-headers PROPERTIES FOLDER "Compiler-RT Misc")
 
+# Install gcov compat headers.
+install(FILES ${GCOV_COMPAT_HEADERS}
+  PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
+  DESTINATION ${COMPILER_RT_INSTALL_PATH}/include)
 # Install sanitizer headers.
 install(FILES ${SANITIZER_HEADERS}
   PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
Index: include/gcov.h
===================================================================
--- include/gcov.h
+++ include/gcov.h
@@ -0,0 +1,24 @@
+/*===---------------------------- gcov.h ----------------------------------===*\
+|*
+|*                     The LLVM Compiler Infrastructure
+|*
+|* This file is distributed under the University of Illinois Open Source
+|* License. See LICENSE.TXT for details.
+|*
+|*===----------------------------------------------------------------------===*|
+|*
+|* This file provides symbols for calls which are available to end-users when
+|* using gcov(3).
+|*
+\*===----------------------------------------------------------------------===*/
+
+#ifndef	COMPILER_RT_GCOV_H
+#define	COMPILER_RT_GCOV_H
+
+/*
+ * - Write profile information/counters out to their appropriate GCDA files.
+ * - Reset profile counters to zero.
+ */
+extern void __gcov_flush(void);
+
+#endif
Index: lib/profile/CMakeLists.txt
===================================================================
--- lib/profile/CMakeLists.txt
+++ lib/profile/CMakeLists.txt
@@ -55,6 +55,8 @@
   InstrProfilingRuntime.cc
   InstrProfilingUtil.c)
 
+include_directories(../../include)
+
 if(WIN32)
     list(APPEND PROFILE_SOURCES WindowsMMap.c)
 endif()
Index: lib/profile/GCDAProfiling.c
===================================================================
--- lib/profile/GCDAProfiling.c
+++ lib/profile/GCDAProfiling.c
@@ -29,6 +29,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <gcov.h>
+
 #if defined(_WIN32)
 #include "WindowsMMap.h"
 #else