nanomsg: Add patch for CMake 4+ compatibility

Fix:

| CMake Error at CMakeLists.txt:27 (cmake_minimum_required):
|   Compatibility with CMake < 3.5 has been removed from CMake.
|
|   Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
|   to tell CMake that the project requires at least <min> but has been updated
|   to work with policies introduced by <max> or earlier.
|
|   Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.
|
|
| -- Configuring incomplete, errors occurred!

Signed-off-by: Alper Ak <alperyasinak1@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

2 files changed, 60 insertions, 1 deletions

diff --git a/meta-networking/recipes-connectivity/nanomsg/nanomsg/0001-allow-build-with-cmake-4.patch b/meta-networking/recipes-connectivity/nanomsg/nanomsg/0001-allow-build-with-cmake-4.patch
new file mode 100644
index 0000000000..f61966134d
--- /dev/null
+++ b/meta-networking/recipes-connectivity/nanomsg/nanomsg/0001-allow-build-with-cmake-4.patch
@@ -0,0 +1,57 @@
+From 2e293eb9d3753ef87a5e05bc6ac270add0ad8fa8 Mon Sep 17 00:00:00 2001
+From: Alper Ak <alperyasinak1@gmail.com>
+Date: Wed, 9 Jul 2025 13:25:54 +0300
+Subject: [PATCH] cmake: Set minimum required version to 3.5 for CMake 4+
+ compatibility
+
+Fix:
+
+| CMake Error at CMakeLists.txt:27 (cmake_minimum_required):
+|   Compatibility with CMake < 3.5 has been removed from CMake.
+|
+|   Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
+|   to tell CMake that the project requires at least <min> but has been updated
+|   to work with policies introduced by <max> or earlier.
+|
+|   Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.
+|
+|
+| -- Configuring incomplete, errors occurred!
+
+Upstream-Status: Submitted [https://github.com/nanomsg/nanomsg/pull/1123]
+
+Signed-off-by: Alper Ak <alperyasinak1@gmail.com>
+---
+ CMakeLists.txt      | 2 +-
+ demo/CMakeLists.txt | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index a9ae6a24..2e93724d 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -24,7 +24,7 @@
+ #   IN THE SOFTWARE.
+ #
+ 
+-cmake_minimum_required (VERSION 2.8.12)
++cmake_minimum_required (VERSION 3.5)
+ 
+ project (nanomsg C)
+ include (CheckFunctionExists)
+diff --git a/demo/CMakeLists.txt b/demo/CMakeLists.txt
+index 4807f160..5ea96c4a 100644
+--- a/demo/CMakeLists.txt
++++ b/demo/CMakeLists.txt
+@@ -6,7 +6,7 @@
+ #
+ # Thanks for the idea goes to @maddouri.
+ #
+-cmake_minimum_required (VERSION 2.8.7)
++cmake_minimum_required (VERSION 3.5)
+ 
+ project(nanomsg-demo)
+ 
+-- 
+2.43.0
+
diff --git a/meta-networking/recipes-connectivity/nanomsg/nanomsg_1.2.1.bb b/meta-networking/recipes-connectivity/nanomsg/nanomsg_1.2.1.bb
index 8dce6c5c4a..3aaf056adf 100644
--- a/meta-networking/recipes-connectivity/nanomsg/nanomsg_1.2.1.bb
+++ b/meta-networking/recipes-connectivity/nanomsg/nanomsg_1.2.1.bb
@@ -9,7 +9,9 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=587b3fd7fd291e418ff4d2b8f3904755"
 
 SECTION = "libs/networking"
 
-SRC_URI = "git://github.com/nanomsg/nanomsg.git;protocol=https;branch=master"
+SRC_URI = "git://github.com/nanomsg/nanomsg.git;protocol=https;branch=master \
+        file://0001-allow-build-with-cmake-4.patch"
+
 SRCREV = "fc3f684a80151a3319446fc96083a9ff384ee4fe"