Compile C with C++ files together

template_cpp/src/CMakeLists.txt

@@ -1,7 +1,7 @@
 # DO NAME THE SYMBOLIC VARIABLE `SOURCES`
 
 include_directories(include)
-set(SOURCES src/main.cpp)
+set(SOURCES src/main.cpp src/hello.c)
 
 # DO NOT EDIT THE FOLLOWING LINE
 find_package(Threads)

template_cpp/src/include/hello.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdio.h>
+
+void hello();
+
+#ifdef __cplusplus
+}
+#endif

template_cpp/src/src/hello.c

@@ -0,0 +1,11 @@
+#include "hello.h"
+
+void hello() {
+    printf("Source file that end in .c will be compiled automatically with gcc,\n"
+           "while files that end in .cpp will be compiled automatically with g++.\n"
+           "For those that prefer C, they can either use the provided C++\n"
+           "argument parser and write everything else in C, or delete the\n"
+           "provided main.cpp and start from scratch.\n"
+           "Make sure to have compatible ABI when calling C functions from cpp:\n"
+           "See `hello.h` on how to do this.\n");
+}

template_cpp/src/src/main.cpp

@@ -4,8 +4,10 @@
 
 #include "barrier.hpp"
 #include "parser.hpp"
+#include "hello.h"
 #include <signal.h>
 
+
 static void stop(int) {
   // reset signal handlers to default
   signal(SIGTERM, SIG_DFL);
@@ -32,6 +34,9 @@ int main(int argc, char **argv) {
   Parser parser(argc, argv, requireConfig);
   parser.parse();
 
+  hello();
+  std::cout << std::endl;
+
   std::cout << "My PID: " << getpid() << "\n";
   std::cout << "Use `kill -SIGINT " << getpid() << "` or `kill -SIGTERM "
             << getpid() << "` to stop processing packets\n\n";
@@ -81,5 +86,9 @@ int main(int argc, char **argv) {
 
   std::cout << "Broadcasting messages...\n\n";
 
+  while (true) {
+    std::this_thread::sleep_for(std::chrono::seconds(60));
+  }
+
   return 0;
 }