ovmf: Don't define bool type if building in C23 mode

Backport a patch [1] to fix the below build failure:
 /buildarea/tmp/work/corei7-64-wrs-linux/ovmf/edk2-stable202502/sources/ovmf-edk2-stable202502/SecurityPkg/DeviceSecurity/SpdmLib/Include/hal/LibspdmStdBoolAlt.h:13:17: error: two or more data types in declaration specifiers
 13 | typedef BOOLEAN bool;
 | ^~~~
  /buildarea/tmp/work/corei7-64-wrs-linux/ovmf/edk2-stable202502/sources/ovmf-edk2-stable202502/SecurityPkg/DeviceSecurity/SpdmLib/Include/hal/LibspdmStdBoolAlt.h:13:1: error: useless type name in empty declaration [-Werror]
  13 | typedef BOOLEAN bool;

[1] https://github.com/tianocore/edk2/commit/772fa11ac82579a8f6fa171e6b835f68af3f64be

(From OE-Core rev: 24600013b65c954bd704a6eb673197ac06b87f69)

Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 36 insertions, 0 deletions

diff --git a/meta/recipes-core/ovmf/ovmf/0001-SecurityPkg-Don-t-define-bool-type-if-building-in-C2.patch b/meta/recipes-core/ovmf/ovmf/0001-SecurityPkg-Don-t-define-bool-type-if-building-in-C2.patch
new file mode 100644
index 0000000000..a555070ca5
--- /dev/null
+++ b/meta/recipes-core/ovmf/ovmf/0001-SecurityPkg-Don-t-define-bool-type-if-building-in-C2.patch
@@ -0,0 +1,35 @@
+From 772fa11ac82579a8f6fa171e6b835f68af3f64be Mon Sep 17 00:00:00 2001
+From: Rebecca Cran <rebecca@bsdio.com>
+Date: Mon, 26 May 2025 08:01:39 -0600
+Subject: [PATCH] SecurityPkg: Don't define bool type if building in C23 mode
+
+In C23 bool is a built-in type, so it's not necessary to typedef
+bool in LibspdmStdBoolAlt.h.
+
+Signed-off-by: Rebecca Cran <rebecca@bsdio.com>
+
+Upstream-Status: Backport [https://github.com/tianocore/edk2/commit/772fa11ac82579a8f6fa171e6b835f68af3f64be]
+
+Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
+---
+ .../DeviceSecurity/SpdmLib/Include/hal/LibspdmStdBoolAlt.h     | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/SecurityPkg/DeviceSecurity/SpdmLib/Include/hal/LibspdmStdBoolAlt.h b/SecurityPkg/DeviceSecurity/SpdmLib/Include/hal/LibspdmStdBoolAlt.h
+index 08af7296d0..395ef22d43 100644
+--- a/SecurityPkg/DeviceSecurity/SpdmLib/Include/hal/LibspdmStdBoolAlt.h
++++ b/SecurityPkg/DeviceSecurity/SpdmLib/Include/hal/LibspdmStdBoolAlt.h
+@@ -10,7 +10,10 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
+ #ifndef LIBSPDM_STDBOOL_ALT_H

+ #define LIBSPDM_STDBOOL_ALT_H

+ 

++// In C23, bool is a built-in type

++#if __STDC_VERSION__ < 202311L

+ typedef BOOLEAN bool;

++#endif

+ 

+ #ifndef true

+ #define true  TRUE

+-- 
+2.34.1
+
diff --git a/meta/recipes-core/ovmf/ovmf_git.bb b/meta/recipes-core/ovmf/ovmf_git.bb
index 08879966c3..a8efcc2a46 100644
--- a/meta/recipes-core/ovmf/ovmf_git.bb
+++ b/meta/recipes-core/ovmf/ovmf_git.bb
@@ -30,6 +30,7 @@ SRC_URI = "gitsm://github.com/tianocore/edk2.git;branch=master;protocol=https \
            file://CVE-2024-38797-2.patch \
            file://CVE-2024-38797-3.patch \
            file://CVE-2024-38797-4.patch \
+           file://0001-SecurityPkg-Don-t-define-bool-type-if-building-in-C2.patch \
            "
 
 PV = "edk2-stable202502"