[scarthgap][PATCH] spirv-tools: backport a fix for building with gcc-16

[martin.jansa@gmail.com]

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

Fixes:
https://errors.yoctoproject.org/Errors/Details/905195/
when building on host with gcc-16

Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
 ...sue-with-gcc-16-replaeces-PR-6542-65.patch | 50 +++++++++++++++++++
 .../spir/spirv-tools_1.3.275.0.bb             |  4 +-
 2 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 meta/recipes-graphics/spir/spirv-tools/0001-opt-Fix-build-issue-with-gcc-16-replaeces-PR-6542-65.patch

diff --git a/meta/recipes-graphics/spir/spirv-tools/0001-opt-Fix-build-issue-with-gcc-16-replaeces-PR-6542-65.patch b/meta/recipes-graphics/spir/spirv-tools/0001-opt-Fix-build-issue-with-gcc-16-replaeces-PR-6542-65.patch
new file mode 100644
index 0000000000..ce58b6b8c0
--- /dev/null
+++ b/meta/recipes-graphics/spir/spirv-tools/0001-opt-Fix-build-issue-with-gcc-16-replaeces-PR-6542-65.patch
@@ -0,0 +1,50 @@
+From aab5c96b7eb237b8bcd15e28f8aff068842db4b7 Mon Sep 17 00:00:00 2001
+From: David Neto <dneto@google.com>
+Date: Tue, 3 Mar 2026 12:11:47 -0500
+Subject: [PATCH] opt: Fix build issue with gcc 16  (replaeces PR #6542)
+ (#6567)
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Compiling with gcc 16 throws this error:
+
+FAILED: [code=1]
+source/opt/CMakeFiles/SPIRV-Tools-opt.dir/decoration_manager.cpp.o
+    source/opt/decoration_manager.cpp: In member function
+‘spvtools::opt::analysis::DecorationManager::CloneDecorations(unsigned
+int, unsigned int)’:
+    source/opt/decoration_manager.cpp:546:27: error:
+‘MEM[(unsigned int &)&op + 24]’ may be used uninitialized
+[-Werror=maybe-uninitialized]
+
+546 | if (op.words[0] == from) { // add new pair of operands: (to,
+literal)
+    source/opt/decoration_manager.cpp:545:19: note: ‘op’ declared here
+      545 |           Operand op = inst->GetOperand(i);
+          |                   ^~
+    cc1plus: all warnings being treated as errors
+
+Make sure that the vector is not empty before using it.
+
+Co-authored-by: José Expósito <jose.exposito89@gmail.com>
+Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
+Upstream-Status: Backport [c28f5937bce369dde1d645299a8c9873da43dc72]
+---
+ source/opt/decoration_manager.cpp | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/source/opt/decoration_manager.cpp b/source/opt/decoration_manager.cpp
+index 3e95dbc35..bee7d9482 100644
+--- a/source/opt/decoration_manager.cpp
++++ b/source/opt/decoration_manager.cpp
+@@ -543,7 +543,8 @@ void DecorationManager::CloneDecorations(uint32_t from, uint32_t to) {
+         const uint32_t num_operands = inst->NumOperands();
+         for (uint32_t i = 1; i < num_operands; i += 2) {
+           Operand op = inst->GetOperand(i);
+-          if (op.words[0] == from) {  // add new pair of operands: (to, literal)
++          if (!op.words.empty() &&
++              op.words[0] == from) {  // add new pair of operands: (to, literal)
+             inst->AddOperand(
+                 Operand(spv_operand_type_t::SPV_OPERAND_TYPE_ID, {to}));
+             op = inst->GetOperand(i + 1);
diff --git a/meta/recipes-graphics/spir/spirv-tools_1.3.275.0.bb b/meta/recipes-graphics/spir/spirv-tools_1.3.275.0.bb
index 05c6de1b50..027fa4f9c9 100644
--- a/meta/recipes-graphics/spir/spirv-tools_1.3.275.0.bb
+++ b/meta/recipes-graphics/spir/spirv-tools_1.3.275.0.bb
@@ -8,7 +8,9 @@ LICENSE  = "Apache-2.0"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=3b83ef96387f14655fc854ddc3c6bd57"
 
 SRCREV = "f0cc85efdbbe3a46eae90e0f915dc1509836d0fc"
-SRC_URI = "git://github.com/KhronosGroup/SPIRV-Tools.git;branch=main;protocol=https"
+SRC_URI = "git://github.com/KhronosGroup/SPIRV-Tools.git;branch=main;protocol=https \
+    file://0001-opt-Fix-build-issue-with-gcc-16-replaeces-PR-6542-65.patch \
+"
 PE = "1"
 # These recipes need to be updated in lockstep with each other:
 # glslang, vulkan-headers, vulkan-loader, vulkan-tools, spirv-headers, spirv-tools