[PATCH 1/7] piglit:backport a fix for building with gcc-16

[Hemanth.KumarMD@windriver.com]

From: Hemanth Kumar M D <Hemanth.KumarMD@windriver.com>

Avoid conflict with C++20 std::lerp from <cmath>, which
causes redefinition and ambiguous call errors with newer
toolchains.

Upstream-Status: Backport [https://gitlab.freedesktop.org/mesa/piglit/-/commit/ec0fc2fef0755b1595c3799ab25129174a4b2007]

Signed-off-by: Hemanth Kumar M D <Hemanth.KumarMD@windriver.com>
---
 ...h-rename-local-lerp-to-linear_interp.patch | 46 +++++++++++++++++++
 meta/recipes-graphics/piglit/piglit_git.bb    |  1 +
 2 files changed, 47 insertions(+)
 create mode 100644 meta/recipes-graphics/piglit/piglit/0001-fbo-blit-stretch-rename-local-lerp-to-linear_interp.patch

diff --git a/meta/recipes-graphics/piglit/piglit/0001-fbo-blit-stretch-rename-local-lerp-to-linear_interp.patch b/meta/recipes-graphics/piglit/piglit/0001-fbo-blit-stretch-rename-local-lerp-to-linear_interp.patch
new file mode 100644
index 0000000000..05f1dd687a
--- /dev/null
+++ b/meta/recipes-graphics/piglit/piglit/0001-fbo-blit-stretch-rename-local-lerp-to-linear_interp.patch
@@ -0,0 +1,46 @@
+From ec0fc2fef0755b1595c3799ab25129174a4b2007 Mon Sep 17 00:00:00 2001
+From: Vinson Lee <vlee@freedesktop.org>
+Date: Sat, 7 Feb 2026 18:39:39 -0800
+Subject: [PATCH] fbo-blit-stretch: rename local lerp to linear_interp
+
+Avoid conflict with C++20 std::lerp from <cmath>, which
+causes redefinition and ambiguous call errors with newer
+toolchains.
+
+Upstream-Status: Backport [https://gitlab.freedesktop.org/mesa/piglit/-/commit/ec0fc2fef0755b1595c3799ab25129174a4b2007]
+
+Signed-off-by: Vinson Lee <vlee@freedesktop.org>
+Signed-off-by: Hemanth Kumar M D <Hemanth.KumarMD@windriver.com>
+---
+ tests/fbo/fbo-blit-stretch.cpp | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/tests/fbo/fbo-blit-stretch.cpp b/tests/fbo/fbo-blit-stretch.cpp
+index a83288c0f..b0d362ecd 100644
+--- a/tests/fbo/fbo-blit-stretch.cpp
++++ b/tests/fbo/fbo-blit-stretch.cpp
+@@ -173,7 +173,7 @@ clamp(GLint &x, GLint xmin, GLint xmax)
+ }
+ 
+ static float
+-lerp(float x0, float x1, float w)
++linear_interp(float x0, float x1, float w)
+ {
+ 	return x0 + (x1 - x0) * w;
+ }
+@@ -181,9 +181,9 @@ lerp(float x0, float x1, float w)
+ static float
+ lerp2d(float xy00, float xy01, float xy10, float xy11, float wx, float wy)
+ {
+-	float y0 = lerp(xy00, xy01, wx);
+-	float y1 = lerp(xy10, xy11, wx);
+-	return lerp(y0, y1, wy);
++	float y0 = linear_interp(xy00, xy01, wx);
++	float y1 = linear_interp(xy10, xy11, wx);
++	return linear_interp(y0, y1, wy);
+ }
+ 
+ static float clearColor[4] = {
+-- 
+2.49.0
+
diff --git a/meta/recipes-graphics/piglit/piglit_git.bb b/meta/recipes-graphics/piglit/piglit_git.bb
index 7659635062..0dd9c58714 100644
--- a/meta/recipes-graphics/piglit/piglit_git.bb
+++ b/meta/recipes-graphics/piglit/piglit_git.bb
@@ -14,6 +14,7 @@ SRC_URI = "git://gitlab.freedesktop.org/mesa/piglit.git;protocol=https;branch=ma
            file://0001-tests-egl-spec-make-egl_ext_surface_compression-cond.patch \
            file://0001-tests-no_error.py-modify-_command-and-not-command.patch \
            file://0001-generated_tests-use-shape-in-place-of-newshape-on-nu.patch \
+           file://0001-fbo-blit-stretch-rename-local-lerp-to-linear_interp.patch \
            "
 UPSTREAM_CHECK_COMMITS = "1"
 
-- 
2.49.0