cmake: Added Code generation test

test cases/cmake/3 code gen/main.cpp

@@ -0,0 +1,8 @@
+#include <iostream>
+#include "test.hpp"
+
+using namespace std;
+
+int main() {
+  cout << getStr() << endl;
+}

test cases/cmake/3 code gen/meson.build

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+project('cmake_code_gen', ['cpp'])
+
+# Subproject with the "code generator"
+sub_pro = subproject('cmCodeGen')
+sub_exe = sub_pro.get_variable('genA')
+
+# Generate the source
+generated = custom_target(
+  'cmake-generated',
+  input: [],
+  output: ['test.cpp'],
+  command: [sub_exe, '@OUTPUT@']
+)
+
+# Build the exe
+exe1 = executable('main1', ['main.cpp', generated])
+
+test('test1', exe1)

test cases/cmake/3 code gen/subprojects/cmCodeGen/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.7)
+
+set(CMAKE_CXX_STANDARD 14)
+
+add_executable(genA main.cpp)

test cases/cmake/3 code gen/subprojects/cmCodeGen/main.cpp

@@ -0,0 +1,21 @@
+#include <iostream>
+#include <fstream>
+
+using namespace std;
+
+int main(int argc, const char *argv[]) {
+  if(argc < 2) {
+    cerr << argv[0] << " requires an output file!" << endl;
+    return 1;
+  }
+  ofstream out(argv[1]);
+  out << R"(
+#include "test.hpp"
+
+std::string getStr() {
+  return "Hello World";
+}
+)";
+
+  return 0;
+}

test cases/cmake/3 code gen/test.hpp

@@ -0,0 +1,5 @@
+#pragma once
+
+#include <string>
+
+std::string getStr();