Index: cmake/config-ix.cmake
===================================================================
--- cmake/config-ix.cmake
+++ cmake/config-ix.cmake
@@ -141,6 +141,9 @@
 check_symbol_exists(exp math.h HAVE_EXP)
 check_symbol_exists(exp2 math.h HAVE_EXP2)
 check_symbol_exists(exp10 math.h HAVE_EXP10)
+check_symbol_exists(round math.h HAVE_ROUND)
+check_symbol_exists(roundf math.h HAVE_ROUNDF)
+check_symbol_exists(roundl math.h HAVE_ROUNDL)
 check_symbol_exists(futimens sys/stat.h HAVE_FUTIMENS)
 check_symbol_exists(futimes sys/time.h HAVE_FUTIMES)
 if( HAVE_SETJMP_H )
Index: include/llvm/Config/config.h.cmake
===================================================================
--- include/llvm/Config/config.h.cmake
+++ include/llvm/Config/config.h.cmake
@@ -98,6 +98,15 @@
 /* Define to 1 if you have the `floorf' function. */
 #cmakedefine HAVE_FLOORF ${HAVE_FLOORF}
 
+/* Define to 1 if you have the `round' function. */
+#cmakedefine HAVE_ROUND ${HAVE_ROUND}
+
+/* Define to 1 if you have the `roundf' function. */
+#cmakedefine HAVE_ROUNDF ${HAVE_ROUNDF}
+
+/* Define to 1 if you have the `roundl' function. */
+#cmakedefine HAVE_ROUNDL ${HAVE_ROUNDL}
+
 /* Define to 1 if you have the `log' function. */
 #cmakedefine HAVE_LOG ${HAVE_LOG}
 
Index: include/llvm/Config/config.h.in
===================================================================
--- include/llvm/Config/config.h.in
+++ include/llvm/Config/config.h.in
@@ -98,6 +98,15 @@
 /* Define to 1 if you have the `floorf' function. */
 #undef HAVE_FLOORF
 
+/* Define to 1 if you have the `round' function. */
+#undef HAVE_ROUND
+
+/* Define to 1 if you have the `roundf' function. */
+#undef HAVE_ROUNDF
+
+/* Define to 1 if you have the `roundl' function. */
+#undef HAVE_ROUNDL
+
 /* Define to 1 if you have the `fmodf' function. */
 #undef HAVE_FMODF