qemu/hw-usb-dev-mtp-Fix-GCC-9-build-warning.patch

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From: Alistair Francis <Alistair.Francis@wdc.com>
Date: Sat, 4 May 2019 07:58:55 -0600
Subject: hw/usb/dev-mtp: Fix GCC 9 build warning
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Fix this warning with GCC 9 on Fedora 30:
hw/usb/dev-mtp.c:1715:36: error: taking address of packed member of ‘struct <anonymous>’ may result in an unaligned pointer value [-Werror=address-of-packed-member]
1715 | dataset->filename);
| ~~~~~~~^~~~~~~~~~
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
hw/usb/dev-mtp.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/hw/usb/dev-mtp.c b/hw/usb/dev-mtp.c
index 15a2243101f8c465e038e26c6551..d4d3a388f2034d735a6595fdaa36 100644
--- a/hw/usb/dev-mtp.c
+++ b/hw/usb/dev-mtp.c
@@ -1721,9 +1721,22 @@ static void usb_mtp_write_metadata(MTPState *s, uint64_t dlen)
assert(!s->write_pending);
assert(p != NULL);
+/*
+ * We are about to access a packed struct. We are confident that the pointer
+ * address won't be unaligned, so we ignore GCC warnings.
+ */
+#if defined(CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE) && QEMU_GNUC_PREREQ(9, 0)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Waddress-of-packed-member"
+#endif
+
filename = utf16_to_str(MIN(dataset->length, filename_chars),
dataset->filename);
+#if defined(CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE) && QEMU_GNUC_PREREQ(9, 0)
+#pragma GCC diagnostic pop
+#endif
+
if (strchr(filename, '/')) {
usb_mtp_queue_result(s, RES_PARAMETER_NOT_SUPPORTED, d->trans,
0, 0, 0, 0);