Set CMAKE_POLICY_VERSION_MINIMUM=3.5 for ESP-IDF and Zephyr

Signed-off-by: David Laseca Perez <davidlaseca@eprosima.com>

Author: David-LP99

config/freertos/esp32/build.sh

@@ -8,6 +8,11 @@ source $FW_TARGETDIR/venv/bin/activate
 export IDF_TOOLS_PATH=$FW_TARGETDIR/toolchain/espressif
 export IDF_PATH=$FW_TARGETDIR/toolchain/esp-idf
 
+# ESP-IDF v4.1 vendors third-party trees (mbedtls) whose cmake_minimum_required
+# predates 3.5, which CMake 4 rejects outright. Restore the old floor until the
+# pinned ESP-IDF is bumped.
+export CMAKE_POLICY_VERSION_MINIMUM=3.5
+
 eval $(python3 $FW_TARGETDIR/toolchain/esp-idf/tools/idf_tools.py export --prefer-system)
 
 . $IDF_PATH/export.sh

config/freertos/esp32/configure.sh

@@ -57,6 +57,11 @@ UROS_APP_FOLDER="$FW_TARGETDIR/freertos_apps/apps/$UROS_APP"
 export IDF_TOOLS_PATH=$FW_TARGETDIR/toolchain/espressif
 export IDF_PATH=$FW_TARGETDIR/toolchain/esp-idf
 
+# ESP-IDF v4.1 vendors third-party trees (mbedtls) whose cmake_minimum_required
+# predates 3.5, which CMake 4 rejects outright. Restore the old floor until the
+# pinned ESP-IDF is bumped.
+export CMAKE_POLICY_VERSION_MINIMUM=3.5
+
 eval $(python3 $FW_TARGETDIR/toolchain/esp-idf/tools/idf_tools.py export --prefer-system)
 
 . $IDF_PATH/export.sh

config/zephyr/generic/build.sh

@@ -9,6 +9,11 @@ pushd $FW_TARGETDIR >/dev/null
     export ZEPHYR_SDK_INSTALL_DIR=$FW_TARGETDIR/zephyr-sdk
     export PATH=~/.local/bin:"$PATH"
 
+    # Zephyr v2.6.0 vendors third-party modules (civetweb) whose
+    # cmake_minimum_required predates 3.5, which CMake 4 rejects outright.
+    # Restore the old floor until the pinned Zephyr is bumped.
+    export CMAKE_POLICY_VERSION_MINIMUM=3.5
+
 
     # Retrieve user app
     unset UROS_APP