[Qemu-trivial] [PATCH v1 4/5] linux-user/uname: Fix GCC 9 build warnings

[Alistair Francis]

Fix this warning when building with GCC9 on Fedora 30:
In function ‘strncpy’,
    inlined from ‘sys_uname’ at /home/alistair/qemu/linux-user/uname.c:94:3:
/usr/include/bits/string_fortified.h:106:10: error: ‘__builtin_strncpy’ output 
may be truncated copying 64 bytes from a string of length 64 
[-Werror=stringop-truncation]
  106 |   return __builtin___strncpy_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Alistair Francis <address@hidden>
---
 linux-user/uname.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/linux-user/uname.c b/linux-user/uname.c
index 313b79dbad..293b2238f2 100644
--- a/linux-user/uname.c
+++ b/linux-user/uname.c
@@ -90,6 +90,11 @@ int sys_uname(struct new_utsname *buf)
    * struct linux kernel uses).
    */
 
+#if defined(CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE) && QEMU_GNUC_PREREQ(9, 0)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstringop-truncation"
+#endif
+
   memset(buf, 0, sizeof(*buf));
   COPY_UTSNAME_FIELD(buf->sysname, uts_buf.sysname);
   COPY_UTSNAME_FIELD(buf->nodename, uts_buf.nodename);
@@ -101,6 +106,9 @@ int sys_uname(struct new_utsname *buf)
 #endif
   return (0);
 
+#if defined(CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE) && QEMU_GNUC_PREREQ(9, 0)
+#pragma GCC diagnostic pop
+#endif
 #undef COPY_UTSNAME_FIELD
 }
 
-- 
2.21.0