test: add test for C++ applications (#1254)

* test: add test for C++ applications

* cmake: move some compile options to C only

* cmake: move -Wshorten-64-to-32 to C-only

* sanitizer: add clang++

* test: move compile options to C only

* test: fix cmake lint

* ci: rename job

* atomic: attempt to fix __iso_volatile_load8() compile error

* atomic: change unsigned to volatile

.github/workflows/cmake_win.yml

@@ -1,4 +1,4 @@
-name: CMake and Windows
+name: Windows
 
 on:
   push:

.github/workflows/sanitizers.yml

@@ -18,8 +18,10 @@ jobs:
         sanitizer: [thread, address, undefined]
     env:
       CC: clang-18
+      CXX: clang++-18
       CMAKE_GENERATOR: Ninja
       CFLAGS: "-fsanitize=${{ matrix.sanitizer }} -fno-sanitize-recover=all -fno-sanitize=function"
+      CXXFLAGS: "-fsanitize=${{ matrix.sanitizer }} -fno-sanitize-recover=all -fno-sanitize=function"
       ASAN_OPTIONS: fast_unwind_on_malloc=0
 
     steps:

CMakeLists.txt

@@ -83,15 +83,15 @@ endif()
 
 if(CMAKE_C_COMPILER_ID MATCHES "Clang")
     add_compile_options(
-      -Wshorten-64-to-32
       -Wno-gnu-zero-variadic-macro-arguments
       -Wno-c2x-extensions
     )
+    add_compile_options("$<$<COMPILE_LANGUAGE:C>:-Wshorten-64-to-32>")
 endif()
 
 check_c_compiler_flag("-Watomic-implicit-seq-cst" COMPILER_SUPPORTS_WATOMIC)
 if(COMPILER_SUPPORTS_WATOMIC)
-  add_compile_options(-Watomic-implicit-seq-cst)
+  add_compile_options("$<$<COMPILE_LANGUAGE:C>:-Watomic-implicit-seq-cst>")
 endif()
 
 if(CMAKE_C_COMPILER_ID MATCHES "Clang")

test/CMakeLists.txt

@@ -30,11 +30,13 @@ include(sanitizer)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 set(CMAKE_BUILD_TYPE Debug)
+set(CMAKE_CXX_STANDARD 11)
 
 if(MSVC)
   add_compile_options("/W3")
 else()
-  add_compile_options(
+
+  set(c_flags
     -Wall
     -Wbad-function-cast
     -Wcast-align
@@ -49,10 +51,14 @@ else()
     -Wuninitialized
     -Wvla
   )
+
+  add_compile_options(
+    "$<$<COMPILE_LANGUAGE:C>:${c_flags}>"
+  )
 endif()
 
 if(CMAKE_C_COMPILER_ID MATCHES "Clang")
-  add_compile_options(-Wshorten-64-to-32)
+  add_compile_options("$<$<COMPILE_LANGUAGE:C>:-Wshorten-64-to-32>")
 endif()
 
 include_directories(
@@ -153,6 +159,8 @@ if(USE_OPENSSL)
   )
 endif()
 
+list(APPEND SRCS cplusplus.cpp)
+
 
 ##############################################################################
 #

test/cplusplus.cpp

@@ -0,0 +1,25 @@
+/**
+ * @file cplusplus.cpp Emulate C++ applications
+ *
+ * Copyright (C) 2025 Alfred E. Heggestad
+ */
+
+#include <iostream>
+#include <re_atomic.h>
+#include <re.h>
+#include "test.h"
+
+
+#define DEBUG_MODULE "cplusplus"
+#define DEBUG_LEVEL 5
+#include <re_dbg.h>
+
+
+int test_cplusplus(void)
+{
+	std::cout << "test\n";
+
+	DEBUG_NOTICE("%H\n", sys_kernel_get, nullptr);
+
+	return 0;
+}

test/test.c

@@ -279,6 +279,7 @@ static const struct test tests_integration[] = {
 	TEST(test_tmr_jiffies_usec),
 	TEST(test_turn_thread),
 	TEST(test_thread_cnd_timedwait),
+	TEST(test_cplusplus),
 };
 
 

test/test.h

@@ -388,6 +388,16 @@ int  test_integration(const char *name, bool verbose);
 int  test_sipevent_network(void);
 int  test_sip_drequestf_network(void);
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int  test_cplusplus(void);
+
+#ifdef __cplusplus
+}
+#endif
+
 /* High-level API */
 int  test_reg(const char *name, bool verbose);
 int  test_oom(const char *name, bool verbose);