[newlib-cygwin] Cygwin: fix bumptious GCC 7 warnings

[Corinna Vinschen <corinna at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=6497fdfaf41d47e835fdefc78ecb0a934875d7cf

commit 6497fdfaf41d47e835fdefc78ecb0a934875d7cf
Author: Corinna Vinschen <corinna@vinschen.de>
Date:   Tue Jun 26 17:20:48 2018 +0200

    Cygwin: fix bumptious GCC 7 warnings
    
    Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

Diff:
---
 winsup/cygserver/sysv_sem.cc |  2 +-
 winsup/utils/dumper.cc       | 10 ++++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/winsup/cygserver/sysv_sem.cc b/winsup/cygserver/sysv_sem.cc
index 349322c..76efab4 100644
--- a/winsup/cygserver/sysv_sem.cc
+++ b/winsup/cygserver/sysv_sem.cc
@@ -249,7 +249,7 @@ seminit(void)
 	for (i = 0; i < seminfo.semmni; i++)
 	{
 		char *buf = (char *) sys_malloc(16, M_SEM, M_WAITOK);
-		snprintf(buf, 16, "semid[%d]", i);
+		snprintf(buf, 16, "semid[%d]", (short) i);
 		mtx_init(&sema_mtx[i], buf, NULL, MTX_DEF);
 	}
 	for (i = 0; i < seminfo.semmnu; i++) {
diff --git a/winsup/utils/dumper.cc b/winsup/utils/dumper.cc
index b2e03e8..14b9933 100644
--- a/winsup/utils/dumper.cc
+++ b/winsup/utils/dumper.cc
@@ -415,7 +415,10 @@ dumper::dump_thread (asection * to, process_thread * thread)
   bfd_putl32 (NOTE_NAME_SIZE, header.elf_note_header.namesz);
   bfd_putl32 (sizeof (thread_pstatus), header.elf_note_header.descsz);
   bfd_putl32 (NT_WIN32PSTATUS, header.elf_note_header.type);
-  strncpy ((char *) &header.elf_note_header.name, "win32thread", NOTE_NAME_SIZE);
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstringop-overflow"
+  strncpy (header.elf_note_header.name, "win32thread", NOTE_NAME_SIZE);
+#pragma GCC diagnostic pop
 
   thread_pstatus.data_type = NOTE_INFO_THREAD;
   thread_pstatus.data.thread_info.tid = thread->tid;
@@ -478,7 +481,10 @@ dumper::dump_module (asection * to, process_module * module)
   bfd_putl32 (NOTE_NAME_SIZE, header.elf_note_header.namesz);
   bfd_putl32 (note_length, header.elf_note_header.descsz);
   bfd_putl32 (NT_WIN32PSTATUS, header.elf_note_header.type);
-  strncpy ((char *) &header.elf_note_header.name, "win32module", NOTE_NAME_SIZE);
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstringop-overflow"
+  strncpy (header.elf_note_header.name, "win32module", NOTE_NAME_SIZE);
+#pragma GCC diagnostic pop
 
   module_pstatus_ptr->data_type = NOTE_INFO_MODULE;
   module_pstatus_ptr->data.module_info.base_address = module->base_address;