From 82b63189f48a56d16a5e9a5473b995d47924747d Mon Sep 17 00:00:00 2001
From: Stefano Sanfilippo <a.little.coder@gmail.com>
Date: Thu, 5 Mar 2015 14:24:27 +0100
Subject: [PATCH] Adding new features to features.cpp compiler checks.

---
 CMakeLists.txt     | 11 ++++++++++-
 cmake/features.cpp | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 26332d9..f38f1fe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,7 +25,8 @@ message("== Report build errors to https://github.com/esseks/monicelli/issues")
 
 ## 1. Compiler sanity check
 
-try_compile(
+try_run(
+    execution_results
     supported_compiler
     ${CMAKE_CURRENT_BINARY_DIR}
     ${CMAKE_CURRENT_SOURCE_DIR}/cmake/features.cpp
@@ -44,6 +45,14 @@ if (NOT supported_compiler)
     )
 endif()
 
+if (execution_results MATCHES FAILED_TO_RUN)
+    message(FATAL_ERROR
+        "Your compiler supports the set of C++11 features we need, "
+        "but something failed.\n"
+        "Run cmake with -Dcheckfeat=1 to see the exact cause."
+    )
+endif()
+
 ## 2. Find Flex and Bison
 
 find_package(BISON REQUIRED)
diff --git a/cmake/features.cpp b/cmake/features.cpp
index 051ba0e..b6187ca 100644
--- a/cmake/features.cpp
+++ b/cmake/features.cpp
@@ -28,6 +28,24 @@
 
 #include <vector>
 #include <string>
+#include <cassert>
+
+
+const int global_i = 0;
+
+struct TestingReferenceBinding {
+    TestingReferenceBinding(int const& ii) {
+        assert(&ii == &global_i);
+    }
+
+    void operator=(int const& ii) {
+        assert(&ii == &global_i);
+    }
+
+    void operator=(int&&) {
+        assert(false);
+    }
+};
 
 enum class Dummy {
     FOO, BAR, BAZ
@@ -37,6 +55,12 @@ class Banana {
     int yep() const noexcept {
         return 0;
     }
+
+    virtual void something() {}
+};
+
+class Phone: public Banana {
+    virtual void something() override {}
 };
 
 int main() {
@@ -49,4 +73,14 @@ int main() {
     Banana a;
     Banana b = std::move(a);
     long c = std::stol("100");
+
+    // Boost::Optional sanity check for old compilers
+    int const& iref = global_i;
+    assert(&iref == &global_i);
+
+    TestingReferenceBinding ttt = global_i;
+    ttt = global_i;
+
+    TestingReferenceBinding ttt2 = iref;
+    ttt2 = iref;
 }