usb: device: class: gs_usb: allow including header from C++ code

.github/workflows/build.yml

@@ -38,3 +38,12 @@ jobs:
             EXTRA_TWISTER_FLAGS="--short-build-path -O/tmp/twister-out"
           fi
           west twister -T app -v --inline-logs --integration $EXTRA_TWISTER_FLAGS
+
+      - name: Run tests
+        working-directory: cannectivity
+        shell: bash
+        run: |
+          if [ "${{ runner.os }}" = "Windows" ]; then
+            EXTRA_TWISTER_FLAGS="--short-build-path -O/tmp/twister-out"
+          fi
+          west twister -T tests -v --inline-logs --integration $EXTRA_TWISTER_FLAGS

include/cannectivity/usb/class/gs_usb.h

@@ -28,6 +28,10 @@
 
 #include <zephyr/device.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * @name Geschwister Schneider USB/CAN protocol software/hardware version definitions
  * @{
@@ -631,4 +635,8 @@ struct gs_usb_ops {
 int gs_usb_register(const struct device *dev, const struct device **channels, size_t nchannels,
 		    const struct gs_usb_ops *ops, void *user_data);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* CANNECTIVITY_INCLUDE_USB_CLASS_GS_USB_H_ */

tests/subsys/usb/gs_usb/cxx/CMakeLists.txt

@@ -0,0 +1,10 @@
+# Copyright (c) 2024 Henrik Brix Andersen <[email protected]>
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+
+project(cxx LANGUAGES CXX)
+
+FILE(GLOB app_sources src/*.cpp)
+target_sources(app PRIVATE ${app_sources})

tests/subsys/usb/gs_usb/cxx/app.overlay

@@ -0,0 +1,11 @@
+/*
+ * Copyright (c) 2024 Henrik Brix Andersen <[email protected]>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&zephyr_udc0 {
+	gs_usb0: gs_usb0 {
+		compatible = "gs_usb";
+	};
+};

tests/subsys/usb/gs_usb/cxx/prj.conf

@@ -0,0 +1,7 @@
+CONFIG_CPP=y
+
+CONFIG_USB_DEVICE_STACK=y
+
+CONFIG_USB_DEVICE_GS_USB_IDENTIFICATION=y
+CONFIG_USB_DEVICE_GS_USB_TIMESTAMP=y
+CONFIG_USB_DEVICE_GS_USB_TERMINATION=y

tests/subsys/usb/gs_usb/cxx/src/main.cpp

@@ -0,0 +1,7 @@
+/*
+ * Copyright (c) 2024 Henrik Brix Andersen <[email protected]>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <cannectivity/usb/class/gs_usb.h>

tests/subsys/usb/gs_usb/cxx/testcase.yaml

@@ -0,0 +1,33 @@
+# Copyright (c) 2024 Henrik Brix Andersen <[email protected]>
+# SPDX-License-Identifier: Apache-2.0
+
+common:
+  tags: usb can
+  depends_on: usb_device
+  build_only: true
+  integration_platforms:
+    - frdm_k64f
+  platform_exclude:
+    - native_sim
+tests:
+  usb.gs_usb.cxx98:
+    extra_configs:
+      - CONFIG_STD_CPP98=y
+  usb.gs_usb.cxx11:
+    extra_configs:
+      - CONFIG_STD_CPP11=y
+  usb.gs_usb.cxx14:
+    extra_configs:
+      - CONFIG_STD_CPP14=y
+  usb.gs_usb.cxx17:
+    extra_configs:
+      - CONFIG_STD_CPP17=y
+  usb.gs_usb.cxx2a:
+    extra_configs:
+      - CONFIG_STD_CPP2A=y
+  usb.gs_usb.cxx20:
+    extra_configs:
+      - CONFIG_STD_CPP20=y
+  usb.gs_usb.cxx2b:
+    extra_configs:
+      - CONFIG_STD_CPP2B=y