From 98d6180c7b5f6d2d95e8b7fd4bc68b754e632f37 Mon Sep 17 00:00:00 2001
From: Dan Collins <dan@collinsnz.com>
Date: Mon, 2 Jun 2025 22:42:41 +1200
Subject: [PATCH] hal_rpi_pico: require GNU extensions for pico SDK

The pico SDK uses typeof() and the current approach, in
CMakeLists.txt, wasn't enough. This commit adds a
dependency on GNU extensions to ensure the builds pass.

Signed-off-by: Dan Collins <dan@collinsnz.com>
---
 modules/hal_rpi_pico/CMakeLists.txt | 1 -
 modules/hal_rpi_pico/Kconfig        | 2 ++
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules/hal_rpi_pico/CMakeLists.txt b/modules/hal_rpi_pico/CMakeLists.txt
index 42f0bdfd3ef0..31ead3d58e54 100644
--- a/modules/hal_rpi_pico/CMakeLists.txt
+++ b/modules/hal_rpi_pico/CMakeLists.txt
@@ -4,7 +4,6 @@ include(ExternalProject)
 
 if(CONFIG_HAS_RPI_PICO)
   zephyr_library()
-  set_property(TARGET ${ZEPHYR_CURRENT_LIBRARY} PROPERTY C_STANDARD 11)
 
   set(rp2_common_dir ${ZEPHYR_HAL_RPI_PICO_MODULE_DIR}/src/rp2_common)
   set(rp2xxx_dir ${ZEPHYR_HAL_RPI_PICO_MODULE_DIR}/src/${CONFIG_SOC_SERIES})
diff --git a/modules/hal_rpi_pico/Kconfig b/modules/hal_rpi_pico/Kconfig
index 3c37c84f4c01..dd64ed33cbab 100644
--- a/modules/hal_rpi_pico/Kconfig
+++ b/modules/hal_rpi_pico/Kconfig
@@ -3,6 +3,8 @@
 
 config HAS_RPI_PICO
 	bool
+	# pico-sdk makes use of typeof - and for that we need GNU extensions!
+	select GNU_C_EXTENSIONS
 
 config PICOSDK_USE_UART
 	bool