diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index abdc2855ac0..c5e642c5e10 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2006-03-13  Jie Zhang  <jie.zhang@analog.com>
+
+	* config/bfin/uclinux.h: Define _GNU_SOURCE in CPLUSPLUS_CPP_SPEC.
+
 2006-03-13  Jeff Law  <law@redhat.com>
 
 	* tree-vrp.c (stmt_interesting_for_vrp): Some statements with
diff --git a/gcc/config/bfin/uclinux.h b/gcc/config/bfin/uclinux.h
index 4372af24257..7476df8255a 100644
--- a/gcc/config/bfin/uclinux.h
+++ b/gcc/config/bfin/uclinux.h
@@ -1,3 +1,7 @@
+/* The GNU C++ standard library requires that these macros be defined.  */
+#undef CPLUSPLUS_CPP_SPEC
+#define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
+
 #undef  STARTFILE_SPEC
 #define STARTFILE_SPEC \
   "crt1%O%s crti%O%s crtbegin%O%s crtlibid%O%s"