[PATCH] ovmf: backport a fix for build with gcc-16

[PATCH] ovmf: backport a fix for build with gcc-16

[martin.jansa]

From: Martin Jansa <martin.jansa@gmail.com>

Fixes build on host with gcc-16:

StringFuncs.c: In function ‘SplitStringByWhitespace’:
StringFuncs.c:113:15: error: variable ‘Item’ set but not used [-Werror=unused-but-set-variable=]
  113 |   UINTN       Item;
      |               ^~~~

and

EfiRom.c: In function ‘main’:
EfiRom.c:78:17: error: assignment discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
   78 |       if ((Ptr0 = strstr ((CONST CHAR8 *) mOptions.FileList->FileName, DEFAULT_OUTPUT_EXTENSION)) != NULL) {
      |                 ^

Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
---
 ...Tools-StringFuncs-fix-gcc-16-warning.patch | 42 ++++++++++++++++++
 ...aseTools-EfiRom-fix-compiler-warning.patch | 44 +++++++++++++++++++
 meta/recipes-core/ovmf/ovmf_git.bb            |  2 +
 3 files changed, 88 insertions(+)
 create mode 100644 meta/recipes-core/ovmf/ovmf/0006-BaseTools-StringFuncs-fix-gcc-16-warning.patch
 create mode 100644 meta/recipes-core/ovmf/ovmf/0007-BaseTools-EfiRom-fix-compiler-warning.patch

diff --git a/meta/recipes-core/ovmf/ovmf/0006-BaseTools-StringFuncs-fix-gcc-16-warning.patch b/meta/recipes-core/ovmf/ovmf/0006-BaseTools-StringFuncs-fix-gcc-16-warning.patch
new file mode 100644
index 0000000000..a465dede9c
--- /dev/null
+++ b/meta/recipes-core/ovmf/ovmf/0006-BaseTools-StringFuncs-fix-gcc-16-warning.patch
@@ -0,0 +1,42 @@
+From 015c26aea52a54e96319887ea542870b4804fb91 Mon Sep 17 00:00:00 2001
+From: Gerd Hoffmann <kraxel@redhat.com>
+Date: Thu, 29 Jan 2026 09:23:32 +0100
+Subject: [PATCH] BaseTools/StringFuncs: fix gcc 16 warning
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+StringFuncs.c: In function ‘SplitStringByWhitespace’:
+StringFuncs.c:113:15: error: variable ‘Item’ set but not used [-Werror=unused-but-set-variable=]
+  113 |   UINTN       Item;
+      |               ^~~~
+
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+
+Upstream-Status: Backport [edk2-stable202602 https://github.com/tianocore/edk2/commit/3597306191297b504683b83fe7750e49c6a2e836]
+Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
+---
+ BaseTools/Source/C/Common/StringFuncs.c | 3 +--
+ 1 file changed, 1 insertion(+), 2 deletions(-)
+
+diff --git a/BaseTools/Source/C/Common/StringFuncs.c b/BaseTools/Source/C/Common/StringFuncs.c
+index 53e44365e9..df02d9c808 100644
+--- a/BaseTools/Source/C/Common/StringFuncs.c
++++ b/BaseTools/Source/C/Common/StringFuncs.c
+@@ -110,7 +110,6 @@ SplitStringByWhitespace (
+   CHAR8       *EndOfSubString;
+   CHAR8       *EndOfString;
+   STRING_LIST *Output;
+-  UINTN       Item;
+ 
+   String = CloneString (String);
+   if (String == NULL) {
+@@ -120,7 +119,7 @@ SplitStringByWhitespace (
+ 
+   Output = NewStringList ();
+ 
+-  for (Pos = String, Item = 0; Pos < EndOfString; Item++) {
++  for (Pos = String; Pos < EndOfString;) {
+     while (isspace ((int)*Pos)) {
+       Pos++;
+     }
diff --git a/meta/recipes-core/ovmf/ovmf/0007-BaseTools-EfiRom-fix-compiler-warning.patch b/meta/recipes-core/ovmf/ovmf/0007-BaseTools-EfiRom-fix-compiler-warning.patch
new file mode 100644
index 0000000000..7aaafe6efb
--- /dev/null
+++ b/meta/recipes-core/ovmf/ovmf/0007-BaseTools-EfiRom-fix-compiler-warning.patch
@@ -0,0 +1,44 @@
+From 4d2bdadcd6d45f6708b1b4827b0dc9b6e4b8edd2 Mon Sep 17 00:00:00 2001
+From: Gerd Hoffmann <kraxel@redhat.com>
+Date: Mon, 8 Dec 2025 10:28:50 +0100
+Subject: [PATCH] BaseTools/EfiRom: fix compiler warning
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+New warning after updating gcc:
+
+EfiRom.c: In function ‘main’:
+EfiRom.c:78:17: error: assignment discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
+
+The assigned value is not used, so fix the warning by just removing it.
+
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+
+Upstream-Status: Backport [edk2-stable202602 https://github.com/tianocore/edk2/commit/9af06ef3cbb052b142f9660c2c01e7aeb401300c]
+Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
+---
+ BaseTools/Source/C/EfiRom/EfiRom.c | 3 +--
+ 1 file changed, 1 insertion(+), 2 deletions(-)
+
+diff --git a/BaseTools/Source/C/EfiRom/EfiRom.c b/BaseTools/Source/C/EfiRom/EfiRom.c
+index fa7bf0e62e..6e903b3504 100644
+--- a/BaseTools/Source/C/EfiRom/EfiRom.c
++++ b/BaseTools/Source/C/EfiRom/EfiRom.c
+@@ -44,7 +44,6 @@ Returns:
+   FILE_LIST *FList;
+   UINT32    TotalSize;
+   UINT32    Size;
+-  CHAR8     *Ptr0;
+ 
+   SetUtilityName(UTILITY_NAME);
+ 
+@@ -75,7 +74,7 @@ Returns:
+   //
+   if (mOptions.DumpOption == 1) {
+     if (mOptions.FileList != NULL) {
+-      if ((Ptr0 = strstr ((CONST CHAR8 *) mOptions.FileList->FileName, DEFAULT_OUTPUT_EXTENSION)) != NULL) {
++      if (strstr ((CONST CHAR8 *) mOptions.FileList->FileName, DEFAULT_OUTPUT_EXTENSION) != NULL) {
+         DumpImage (mOptions.FileList);
+         goto BailOut;
+       } else {
diff --git a/meta/recipes-core/ovmf/ovmf_git.bb b/meta/recipes-core/ovmf/ovmf_git.bb
index ec6c3b516c..8b13ed1936 100644
--- a/meta/recipes-core/ovmf/ovmf_git.bb
+++ b/meta/recipes-core/ovmf/ovmf_git.bb
@@ -26,6 +26,8 @@ SRC_URI = "gitsm://github.com/tianocore/edk2.git;branch=master;protocol=https;ta
            file://0003-debug-prefix-map.patch \
            file://0004-reproducible.patch \
            file://0005-UefiCpuPkg-CpuExceptionHandlerLib-fix-push-instructi.patch \
+           file://0006-BaseTools-StringFuncs-fix-gcc-16-warning.patch \
+           file://0007-BaseTools-EfiRom-fix-compiler-warning.patch \
            "
 
 PV = "edk2-stable202511"

Re: [OE-core] [PATCH] ovmf: backport a fix for build with gcc-16

[Mathieu Dubois-Briand]

On Sun Apr 12, 2026 at 11:36 AM CEST, Martin Jansa via lists.openembedded.org wrote:
> From: Martin Jansa <martin.jansa@gmail.com>
>
> Fixes build on host with gcc-16:
>
> StringFuncs.c: In function ‘SplitStringByWhitespace’:
> StringFuncs.c:113:15: error: variable ‘Item’ set but not used [-Werror=unused-but-set-variable=]
>   113 |   UINTN       Item;
>       |               ^~~~
>
> and
>
> EfiRom.c: In function ‘main’:
> EfiRom.c:78:17: error: assignment discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
>    78 |       if ((Ptr0 = strstr ((CONST CHAR8 *) mOptions.FileList->FileName, DEFAULT_OUTPUT_EXTENSION)) != NULL) {
>       |                 ^
>
> Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
> ---

Hi Martin,

Thanks for your patch, but we already got a similar series. Can you
review it and comment if you feel something is missing?

https://lists.openembedded.org/g/openembedded-core/message/234912

Thanks,
Mathieu

-- 
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com