ovmf: fix gcc12 warning for device path handling

Backport [https://github.com/tianocore/edk2/commit/22130dcd98b4d4b76ac8d922adb4a2dbc86fa52c]

Fixes:

In function ?SetDevicePathEndNode?,
    inlined from ?FileDevicePath? at DevicePathUtilities.c:857:5:
DevicePathUtilities.c:321:3: error: writing 4 bytes into a region of size 1 [-Werror=stringop-overflow=]
  321 |   memcpy (Node, &mUefiDevicePathLibEndDevicePath, sizeof (mUefiDevicePathLibEndDevicePath));
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from UefiDevicePathLib.h:22,
                 from DevicePathUtilities.c:16:
../Include/Protocol/DevicePath.h: In function ?FileDevicePath?:
../Include/Protocol/DevicePath.h:51:9: note: destination object ?Type? of size 1
   51 |   UINT8 Type;       ///< 0x01 Hardware Device Path.
      |         ^~~~

Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 42 insertions, 0 deletions

diff --git a/meta/recipes-core/ovmf/ovmf/0001-Basetools-turn-off-gcc12-warning.patch b/meta/recipes-core/ovmf/ovmf/0001-Basetools-turn-off-gcc12-warning.patch
new file mode 100644
index 0000000000..73a432684c
--- /dev/null
+++ b/meta/recipes-core/ovmf/ovmf/0001-Basetools-turn-off-gcc12-warning.patch
@@ -0,0 +1,41 @@
+From 22130dcd98b4d4b76ac8d922adb4a2dbc86fa52c Mon Sep 17 00:00:00 2001
+From: Gerd Hoffmann <kraxel@redhat.com>
+Date: Thu, 24 Mar 2022 20:04:36 +0800
+Subject: [PATCH] Basetools: turn off gcc12 warning
+
+In function ?SetDevicePathEndNode?,
+    inlined from ?FileDevicePath? at DevicePathUtilities.c:857:5:
+DevicePathUtilities.c:321:3: error: writing 4 bytes into a region of size 1 [-Werror=stringop-overflow=]
+  321 |   memcpy (Node, &mUefiDevicePathLibEndDevicePath, sizeof (mUefiDevicePathLibEndDevicePath));
+      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+In file included from UefiDevicePathLib.h:22,
+                 from DevicePathUtilities.c:16:
+../Include/Protocol/DevicePath.h: In function ?FileDevicePath?:
+../Include/Protocol/DevicePath.h:51:9: note: destination object ?Type? of size 1
+   51 |   UINT8 Type;       ///< 0x01 Hardware Device Path.
+      |         ^~~~
+
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+Reviewed-by: Bob Feng <bob.c.feng@intel.com>
+
+Upstream-Status: Backport [https://github.com/tianocore/edk2/commit/22130dcd98b4d4b76ac8d922adb4a2dbc86fa52c]
+Signed-off-by: Steve Sakoman <steve@sakoman.com>
+
+---
+ BaseTools/Source/C/DevicePath/GNUmakefile | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/BaseTools/Source/C/DevicePath/GNUmakefile b/BaseTools/Source/C/DevicePath/GNUmakefile
+index 7ca08af9662d..b05d2bddfa68 100644
+--- a/BaseTools/Source/C/DevicePath/GNUmakefile
++++ b/BaseTools/Source/C/DevicePath/GNUmakefile
+@@ -13,6 +13,9 @@ OBJECTS = DevicePath.o UefiDevicePathLib.o DevicePathFromText.o  DevicePathUtili
+ 

+ include $(MAKEROOT)/Makefiles/app.makefile

+ 

++# gcc 12 trips over device path handling

++BUILD_CFLAGS += -Wno-error=stringop-overflow

++

+ LIBS = -lCommon

+ ifeq ($(CYGWIN), CYGWIN)

+   LIBS += -L/lib/e2fsprogs -luuid

diff --git a/meta/recipes-core/ovmf/ovmf_git.bb b/meta/recipes-core/ovmf/ovmf_git.bb
index ddadbac4b7..a487f77e3c 100644
--- a/meta/recipes-core/ovmf/ovmf_git.bb
+++ b/meta/recipes-core/ovmf/ovmf_git.bb
@@ -20,6 +20,7 @@ SRC_URI = "gitsm://github.com/tianocore/edk2.git;branch=master;protocol=https \
            file://0001-Fix-VLA-parameter-warning.patch \
            file://0001-Basetools-genffs-fix-gcc12-warning.patch \
            file://0001-Basetools-lzmaenc-fix-gcc12-warning.patch \
+           file://0001-Basetools-turn-off-gcc12-warning.patch \
            "
 
 PV = "edk2-stable202008"