Avoid compilers detect misaligned access

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1565766
Signed-off-by: Victor Toso <victortoso@redhat.com>

0001-qxl_dev-Align-QXLRam-to-4-bytes.patch

@@ -0,0 +1,75 @@
+From beda5ec7a6848be20c0cac2a9a8ef2a41e8069c1 Mon Sep 17 00:00:00 2001
+From: Frediano Ziglio <fziglio@redhat.com>
+Date: Thu, 28 Jun 2018 21:30:21 +0100
+Subject: [PATCH] qxl_dev: Align QXLRam to 4 bytes
+
+This avoids compilers detect misaligned access which can lead to
+warnings.
+In QEMU the structure is allocated at the beginning of a 4Kb page,
+in Xspice is allocated with a calloc, so the structure will end up 4
+bytes aligned as well with these users. We are not aware of other users
+of QXLRam, but if there was, it's likely the struct would be at least
+naturally aligned, so this change should not impact anyone.
+Aligning to 4 bytes maintains the size of the structure unchanged
+avoiding possible ABI changes.
+clang currently generates an invalid function call if a misaligned
+4 byte atomic operation is detected.
+
+This fixes https://bugzilla.redhat.com/show_bug.cgi?id=1565766
+
+Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
+Acked-by: Christophe Fergeau <cfergeau@redhat.com>
+---
+ spice/end-packed.h   | 1 +
+ spice/qxl_dev.h      | 2 +-
+ spice/start-packed.h | 2 ++
+ 3 files changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/spice/end-packed.h b/spice/end-packed.h
+index 1acea18..0efd588 100644
+--- a/spice/end-packed.h
++++ b/spice/end-packed.h
+@@ -32,6 +32,7 @@
+ /* See start-packed.h for details */
+ 
+ #undef SPICE_ATTR_PACKED
++#undef SPICE_ATTR_ALIGNED
+ 
+ #if defined(__MINGW32__) || !defined(__GNUC__)
+ #pragma pack(pop)
+diff --git a/spice/qxl_dev.h b/spice/qxl_dev.h
+index 9e753c4..a9cc4f4 100644
+--- a/spice/qxl_dev.h
++++ b/spice/qxl_dev.h
+@@ -253,7 +253,7 @@ SPICE_RING_DECLARE(QXLReleaseRing, uint64_t, QXL_RELEASE_RING_SIZE);
+ #define QXL_INTERRUPT_CLIENT_MONITORS_CONFIG  (1 << 5)
+ 
+ /* qxl-1 compat: append only */
+-typedef struct SPICE_ATTR_PACKED QXLRam {
++typedef struct SPICE_ATTR_ALIGNED(4) SPICE_ATTR_PACKED QXLRam {
+     uint32_t magic;
+     uint32_t int_pending;
+     uint32_t int_mask;
+diff --git a/spice/start-packed.h b/spice/start-packed.h
+index ab3fa98..de0c595 100644
+--- a/spice/start-packed.h
++++ b/spice/start-packed.h
+@@ -48,6 +48,7 @@
+ #ifdef __GNUC__
+ 
+ #define SPICE_ATTR_PACKED __attribute__ ((__packed__))
++#define SPICE_ATTR_ALIGNED(n) __attribute__ ((__aligned__ (n)))
+ 
+ #ifdef __MINGW32__
+ #pragma pack(push,1)
+@@ -58,6 +59,7 @@
+ #pragma pack(push)
+ #pragma pack(1)
+ #define SPICE_ATTR_PACKED
++#define SPICE_ATTR_ALIGNED(n) __declspec (align (n))
+ #pragma warning(disable:4200)
+ #pragma warning(disable:4103)
+ 
+-- 
+2.17.1
+

spice-protocol.spec

@@ -1,12 +1,13 @@
 Name:           spice-protocol
 Version:        0.12.14
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Spice protocol header files
 Group:          Development/Libraries
 # Main headers are BSD, controller / foreign menu are LGPL
 License:        BSD and LGPLv2+
 URL:            http://www.spice-space.org/
 Source0:        http://www.spice-space.org/download/releases/%{name}-%{version}.tar.bz2
+Patch0001:      0001-qxl_dev-Align-QXLRam-to-4-bytes.patch
 BuildArch:      noarch
 
 %description
@@ -17,6 +18,8 @@ and the para-virtual graphics card QXL.
 %prep
 %setup -q
 
+%patch0001 -p1
+
 %build
 %configure
 make %{?_smp_mflags}
@@ -32,6 +35,10 @@ make DESTDIR=%{buildroot} install
 
 
 %changelog
+* Fri Jul 13 2018 Victor Toso <victortoso@redhat.com> - 0.12.14-2
+- Align QXLRam to 4 bytes to avoid compilers detect misaligned access
+  Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1565766
+
 * Thu Jun 07 2018 Christophe Fergeau <cfergeau@redhat.com> - 0.12.14-1
 - Update to 0.12.14 release