diff --git a/csu/libc-start.c b/csu/libc-start.c
index 4005caf84a..2d4d2ed1f9 100644
--- a/csu/libc-start.c
+++ b/csu/libc-start.c
@@ -21,6 +21,7 @@
 #include <unistd.h>
 #include <ldsodefs.h>
 #include <exit-thread.h>
+#include <libc-diag.h>
 #include <libc-internal.h>
 #include <elf/libc-early-init.h>
 #include <stdbool.h>
@@ -298,7 +299,16 @@ LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
   struct pthread_unwind_buf unwind_buf;
 
   int not_first_call;
+  DIAG_PUSH_NEEDS_COMMENT;
+#if __GNUC_PREREQ (7, 0)
+  /* This call results in a -Wstringop-overflow warning because struct
+     pthread_unwind_buf is smaller than jmp_buf.  setjmp and longjmp
+     do not use anything beyond the common prefix (they never access
+     the saved signal mask), so that is a false positive.  */
+  DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overflow=");
+#endif
   not_first_call = setjmp ((struct __jmp_buf_tag *) unwind_buf.cancel_jmp_buf);
+  DIAG_POP_NEEDS_COMMENT;
   if (__glibc_likely (! not_first_call))
     {
       struct pthread *self = THREAD_SELF;
diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c
index 2cba3da38c..447f005ece 100644
--- a/nptl/pthread_create.c
+++ b/nptl/pthread_create.c
@@ -26,6 +26,7 @@
 #include <hp-timing.h>
 #include <ldsodefs.h>
 #include <atomic.h>
+#include <libc-diag.h>
 #include <libc-internal.h>
 #include <resolv.h>
 #include <kernel-features.h>
@@ -400,7 +401,16 @@ START_THREAD_DEFN
   struct pthread_unwind_buf unwind_buf;
 
   int not_first_call;
+  DIAG_PUSH_NEEDS_COMMENT;
+#if __GNUC_PREREQ (7, 0)
+  /* This call results in a -Wstringop-overflow warning because struct
+     pthread_unwind_buf is smaller than jmp_buf.  setjmp and longjmp
+     do not use anything beyond the common prefix (they never access
+     the saved signal mask), so that is a false positive.  */
+  DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overflow=");
+#endif
   not_first_call = setjmp ((struct __jmp_buf_tag *) unwind_buf.cancel_jmp_buf);
+  DIAG_POP_NEEDS_COMMENT;
 
   /* No previous handlers.  NB: This must be done after setjmp since the
      private space in the unwind jump buffer may overlap space used by
diff --git a/nptl/unwind.c b/nptl/unwind.c
index 35ed2a7b10..8f157e49f4 100644
--- a/nptl/unwind.c
+++ b/nptl/unwind.c
@@ -23,6 +23,7 @@
 #include <string.h>
 #include <unistd.h>
 #include "pthreadP.h"
+#include <libc-diag.h>
 #include <jmpbuf-unwind.h>
 
 #ifdef _STACK_GROWS_DOWN
@@ -90,8 +91,17 @@ unwind_stop (int version, _Unwind_Action actions,
 	}
     }
 
+  DIAG_PUSH_NEEDS_COMMENT;
+#if __GNUC_PREREQ (7, 0)
+  /* This call results in a -Wstringop-overflow warning because struct
+     pthread_unwind_buf is smaller than jmp_buf.  setjmp and longjmp
+     do not use anything beyond the common prefix (they never access
+     the saved signal mask), so that is a false positive.  */
+  DIAG_IGNORE_NEEDS_COMMENT (11, "-Wstringop-overflow=");
+#endif
   if (do_longjump)
     __libc_unwind_longjmp ((struct __jmp_buf_tag *) buf->cancel_jmp_buf, 1);
+  DIAG_POP_NEEDS_COMMENT;
 
   return _URC_NO_REASON;
 }