From 5305a12aa9723127b4e8fab3f3c52a0645b4af2b Mon Sep 17 00:00:00 2001
From: Marian Buschsieweke <marian.buschsieweke@posteo.net>
Date: Sun, 2 Nov 2025 23:20:12 +0100
Subject: [PATCH] pkg: Add `-DCMAKE_POLICY_VERSION_MINIMUM=3.5` to cmake flags

This disable policy enforcement of newer cmake 4.1.2 on older cmake
projects. The flags can be removed once the upstream projects are
compatible with newer versions of cmake.

Co-authored-by: crasbe <crasbe@gmail.com>
---
 pkg/ccn-lite/Makefile      | 3 +++
 pkg/cryptoauthlib/Makefile | 3 +++
 pkg/jerryscript/Makefile   | 3 +++
 pkg/openthread/Makefile    | 3 +++
 4 files changed, 12 insertions(+)

diff --git a/pkg/ccn-lite/Makefile b/pkg/ccn-lite/Makefile
index 9cde4f5d07..57629b4543 100644
--- a/pkg/ccn-lite/Makefile
+++ b/pkg/ccn-lite/Makefile
@@ -27,9 +27,12 @@ $(BINDIR)/ccn-lite.a: $(PKG_BUILD_DIR)/lib/libccnl-riot.a
 $(PKG_BUILD_DIR)/lib/libccnl-riot.a: $(PKG_BUILD_DIR)/Makefile
 	$(MAKE) -C $(PKG_BUILD_DIR)
 
+# TODO: Drop `-DCMAKE_POLICY_VERSION_MINIMUM=3.5` once upstream is compatible
+#       with newer cmake (e.g. compilation still succeeds with cmake 4.x)
 $(PKG_BUILD_DIR)/Makefile: $(PKG_PREPARED) $(TOOLCHAIN_FILE) | ..cmake_version_supported
 	cmake -B$(PKG_BUILD_DIR) -H$(PKG_SOURCE_DIR)/src \
 	      -DCMAKE_TOOLCHAIN_FILE=$(TOOLCHAIN_FILE) \
+	      -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
 	      -DCCNL_RIOT=1 -DRIOT_CFLAGS="$(RIOT_CFLAGS)" -DBUILD_TESTING=OFF
 
 $(TOOLCHAIN_FILE): FORCE
diff --git a/pkg/cryptoauthlib/Makefile b/pkg/cryptoauthlib/Makefile
index 555e4ce1bf..73979d1d1a 100644
--- a/pkg/cryptoauthlib/Makefile
+++ b/pkg/cryptoauthlib/Makefile
@@ -36,8 +36,11 @@ cryptoauth: $(PKG_BUILD_DIR)/Makefile
 	$(MAKE) -C $(PKG_BUILD_DIR)
 	cp $(PKG_BUILD_DIR)/libcryptoauth.a $(BINDIR)/$(PKG_NAME).a
 
+# TODO: Drop `-DCMAKE_POLICY_VERSION_MINIMUM=3.5` once upstream is compatible
+#       with newer cmake (e.g. compilation still succeeds with cmake 4.x)
 $(PKG_BUILD_DIR)/Makefile: $(TOOLCHAIN_FILE)
 	cmake -DCMAKE_TOOLCHAIN_FILE=$(TOOLCHAIN_FILE) \
+		  -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
 		  -Wno-dev \
 		  -DATCA_NO_HEAP:BOOL=TRUE \
 		  -B$(PKG_BUILD_DIR) \
diff --git a/pkg/jerryscript/Makefile b/pkg/jerryscript/Makefile
index eef099eb96..0050ad2473 100644
--- a/pkg/jerryscript/Makefile
+++ b/pkg/jerryscript/Makefile
@@ -46,12 +46,15 @@ $(BINDIR)/jerryscript.a: $(PKG_BUILD_DIR)/Makefile
 	@cp $(PKG_BUILD_DIR)/lib/libjerry-ext.a $(BINDIR)/jerryscript-ext.a
 	@cp $(PKG_BUILD_DIR)/lib/libjerry-port-default.a $(BINDIR)/jerryscript-port-default.a
 
+# TODO: Drop `-DCMAKE_POLICY_VERSION_MINIMUM=3.5` once upstream is compatible
+#       with newer cmake (e.g. compilation still succeeds with cmake 4.x)
 $(PKG_BUILD_DIR)/Makefile:
 	cmake -B$(PKG_BUILD_DIR) -H$(PKG_SOURCE_DIR) \
 	 -DCMAKE_SYSTEM_NAME=RIOT \
 	 -DCMAKE_SYSTEM_PROCESSOR="$(MCPU)" \
 	 -DCMAKE_C_COMPILER=$(CC) \
 	 -DCMAKE_C_COMPILER_WORKS=TRUE \
+	 -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
 	 -DENABLE_LTO=OFF \
 	 -DENABLE_AMALGAM=OFF \
 	 -DHAVE_TIME_H=0 \
diff --git a/pkg/openthread/Makefile b/pkg/openthread/Makefile
index 1bdd7dcbf3..3ca66d08bb 100644
--- a/pkg/openthread/Makefile
+++ b/pkg/openthread/Makefile
@@ -64,6 +64,8 @@ $(BINDIR)/openthread-$(TD).a: $(OT_CORE_LIB_DIR)/libopenthread-$(TD).a
 $(OT_CORE_LIB_DIR)/libopenthread-$(TD).a: $(PKG_BUILD_DIR)/Makefile
 	$(QQ)"$(MAKE)" -C $(PKG_BUILD_DIR) $(OT_MODULES)
 
+# TODO: Drop `-DCMAKE_POLICY_VERSION_MINIMUM=3.5` once upstream is compatible
+#       with newer cmake (e.g. compilation still succeeds with cmake 4.x)
 $(PKG_BUILD_DIR)/Makefile:
 	cmake -Wno-dev -B$(PKG_BUILD_DIR) -H$(PKG_SOURCE_DIR) \
 	 -DCMAKE_TRY_COMPILE_TARGET_TYPE=STATIC_LIBRARY \
@@ -75,6 +77,7 @@ $(PKG_BUILD_DIR)/Makefile:
 	 -DCMAKE_CXX_FLAGS="$(OT_C_FLAGS) $(OT_CXXFLAGS) -fno-exceptions -fno-rtti" \
 	 -DCMAKE_NM="$(NM)" \
 	 -DCMAKE_STRIP="$(STRIP)" \
+	 -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
 	 -DOT_PLATFORM=NO \
 	 -DOT_CONFIG="$(RIOTBASE)/pkg/openthread/include/platform_config.h" \
 	 -DOT_APP_CLI=$(OT_APP_CLI) \