From d85fe40f5978642d82ebda9b9f4d57a6beb47d3f Mon Sep 17 00:00:00 2001
From: Hans-Christian Ebke <ebke@cs.rwth-aachen.de>
Date: Mon, 9 Nov 2015 18:04:43 +0100
Subject: [PATCH] Added build support for C++11.

FindCXX11.cmake copied from OpenFlipper.
---
 CMakeLists.txt               | 10 +++++
 cmake/FindCXX11.cmake        | 71 ++++++++++++++++++++++++++++++++++++
 src/Unittests/CMakeLists.txt | 10 +++++
 3 files changed, 91 insertions(+)
 create mode 100644 cmake/FindCXX11.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b8eb0f39..b1d57c19 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,6 +33,16 @@ include (ACGOutput)
 # Definitions
 # ========================================================================
 
+set(INHIBIT_CXX11_SUPPORT OFF CACHE BOOL "Do not use C++11 even if it is available. (This is mainly useful for unit testing.)")
+
+if (NOT INHIBIT_CXX11_SUPPORT)
+find_package (CXX11)
+
+if (CXX11_FOUND)
+  add_definitions(${CXX11_FLAGS} -DCPP11_ENABLED)
+endif (CXX11_FOUND)
+endif (NOT INHIBIT_CXX11_SUPPORT)
+
 if (WIN32)
   add_definitions(
       -D_USE_MATH_DEFINES -DNOMINMAX
diff --git a/cmake/FindCXX11.cmake b/cmake/FindCXX11.cmake
new file mode 100644
index 00000000..a1fe935c
--- /dev/null
+++ b/cmake/FindCXX11.cmake
@@ -0,0 +1,71 @@
+IF (NOT CXX11_FLAGS OR NOT CXX11_FOUND)
+include(CheckCXXSourceCompiles)
+include(FindPackageHandleStandardArgs)
+
+set(CXX11_FLAG_CANDIDATES
+    #Gnu and Intel Linux
+    "-std=c++11"
+    #Microsoft Visual Studio, and everything that automatically accepts C++11
+    " "
+    #Intel windows
+    "/Qstd=c++0x"
+    )
+
+set(CXX11_TEST_SOURCE
+"
+#include <algorithm>
+#include <utility>
+#include <memory>
+
+class Matrix {
+public:
+    // Initializer lists
+    Matrix(int a, int b, int c, int d)
+        : data {a, b, c, d}
+    {
+        // Lambda functions
+        std::transform(data, data+4, data,
+                [](int x) { return x+1; });
+    }
+
+    // rvalue references
+    Matrix(Matrix &&rhs) {
+    }
+
+private:
+    int data[4];
+};
+
+int main()
+{
+    int n[] {4,7,6,1,2};
+    // auto
+    for (auto i : n) {
+        Matrix mat (3,5,1,2);
+
+        // std::move, unique_ptr
+        std::unique_ptr<Matrix> m2(
+        	new Matrix(std::move(mat)));
+    }
+    return 0;
+}
+")
+
+foreach(FLAG ${CXX11_FLAG_CANDIDATES})
+    set(SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
+    set(CMAKE_REQUIRED_FLAGS "${FLAG}")
+    unset(CXX11_FLAG_DETECTED CACHE)
+
+    check_cxx_source_compiles("${CXX11_TEST_SOURCE}" CXX11_FLAG_DETECTED)
+    set(CMAKE_REQUIRED_FLAGS "${SAFE_CMAKE_REQUIRED_FLAGS}")
+    if(CXX11_FLAG_DETECTED)
+        set(CXX11_FLAGS_INTERNAL "${FLAG}")
+        break()
+    endif(CXX11_FLAG_DETECTED)
+endforeach(FLAG ${CXX11_FLAG_CANDIDATES})
+
+set(CXX11_FLAGS "${CXX11_FLAGS_INTERNAL}")
+
+find_package_handle_standard_args(CXX11 DEFAULT_MSG CXX11_FLAGS)
+mark_as_advanced(CXX11_FLAGS)
+ENDIF()
\ No newline at end of file
diff --git a/src/Unittests/CMakeLists.txt b/src/Unittests/CMakeLists.txt
index 270f4242..a629979d 100644
--- a/src/Unittests/CMakeLists.txt
+++ b/src/Unittests/CMakeLists.txt
@@ -22,6 +22,16 @@ if ( OPENMESH_BUILD_UNIT_TESTS )
     # set additional link directories
     link_directories(${GTEST_LIBRARY_DIR} )
 
+    set(INHIBIT_CXX11_SUPPORT OFF CACHE BOOL "Do not use C++11 even if it is available. (This is mainly useful for unit testing.)")
+
+    if (NOT INHIBIT_CXX11_SUPPORT)
+    find_package (CXX11)
+
+    if (CXX11_FOUND)
+      add_definitions(${CXX11_FLAGS} -DCPP11_ENABLED)
+    endif (CXX11_FOUND)
+    endif (NOT INHIBIT_CXX11_SUPPORT)
+
     if ( CMAKE_GENERATOR MATCHES "^Visual Studio 11.*" ) 
       add_definitions( /D _VARIADIC_MAX=10 )
     endif()