From dea76c8e2e8d6dc07c071d395a99d9c6f1b744e2 Mon Sep 17 00:00:00 2001
From: Alex Fabijanic <alex@pocoproject.org>
Date: Tue, 24 Oct 2017 13:52:12 -0500
Subject: [PATCH] add CXX1x compiler capability detection to cmake

---
 CMakeLists.txt    | 28 ++++++++++++++++++++++
 cmake/CXX1x.cmake | 61 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 89 insertions(+)
 create mode 100644 cmake/CXX1x.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a5855af22..85f44d31e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,6 +24,7 @@ string(REGEX REPLACE "[0-9]+\\.[0-9]+\\.([0-9]+).*" "\\1" CPACK_PACKAGE_VERSION_
 set(COMPLETE_VERSION ${CPACK_PACKAGE_VERSION_MAJOR}.${CPACK_PACKAGE_VERSION_MINOR}.${CPACK_PACKAGE_VERSION_PATCH})
 set(RELEASE_NAME "Unstable-trunk")
 set(PROJECT_VERSION ${COMPLETE_VERSION})
+set(CMAKE_C_STANDARD 99)
 
 # Put the libaries and binaries that get built into directories at the
 # top of the build tree rather than in hard-to-find leaf
@@ -43,6 +44,33 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
 # Setup C/C++ compiler options
 #################################################################################
 
+option(DISABLE_CPP11 "Disable C++11 if available" OFF)
+option(DISABLE_CPP14 "Disable C++14 if available" OFF)
+
+if (DISABLE_CPP11 OR DISABLE_CPP14)
+    add_definitions(-DPOCO_DISABLE_CPP11)
+
+    if (DISABLE_CPP14)
+        add_definitions(-DPOCO_DISABLE_CPP14)
+    endif()
+else()
+    # C++11/14 compiler flags
+    include(CXX1x)
+    check_for_cxx11_compiler(CXX11_COMPILER)
+
+    # If a C++11 compiler is available, then set the appropriate flags
+    if(CXX11_COMPILER)
+        enable_cxx11()
+        check_for_cxx14_compiler(CXX14_COMPILER)
+
+        # If a C++14 compiler is available, then set the appropriate flags
+        if(CXX14_COMPILER)
+            enable_cxx14()
+        endif()
+    endif()
+endif()
+
+
 if(NOT MSVC_IDE)
   if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE RelWithDebInfo CACHE STRING
diff --git a/cmake/CXX1x.cmake b/cmake/CXX1x.cmake
new file mode 100644
index 000000000..8977565e8
--- /dev/null
+++ b/cmake/CXX1x.cmake
@@ -0,0 +1,61 @@
+# Copyright (c) 2013 Nathan Osman
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+# Determines whether or not the compiler supports C++11
+macro(check_for_cxx11_compiler _VAR)
+    message(STATUS "Checking for C++11 compiler")
+    set(${_VAR})
+    if((MSVC AND (MSVC10 OR MSVC11 OR MSVC12 OR MSVC14)) OR
+    (CMAKE_COMPILER_IS_GNUCXX AND NOT ${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS 4.6) OR
+    (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND NOT ${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS 3.1) OR
+    (CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang"))
+        set(${_VAR} 1)
+        message(STATUS "Checking for C++11 compiler - available")
+    else()
+        message(STATUS "Checking for C++11 compiler - unavailable")
+    endif()
+endmacro()
+
+# Sets the appropriate flag to enable C++11 support
+macro(enable_cxx11)
+    set (CMAKE_CXX_STANDARD 11)
+    set (CMAKE_CXX_STANDARD_REQUIRED ON)
+endmacro()
+
+# Determines whether or not the compiler supports C++11
+macro(check_for_cxx14_compiler _VAR)
+    message(STATUS "Checking for C++14 compiler")
+    set(${_VAR})
+    if((MSVC AND (MSVC14)) OR
+    (CMAKE_COMPILER_IS_GNUCXX AND NOT ${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS 4.7) OR
+    (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND NOT ${CMAKE_CXX_COMPILER_VERSION} VERSION_LESS 3.4) OR
+    (CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang"))
+        set(${_VAR} 1)
+        message(STATUS "Checking for C++14 compiler - available")
+    else()
+        message(STATUS "Checking for C++14 compiler - unavailable")
+    endif()
+endmacro()
+
+# Sets the appropriate flag to enable C++14 support
+macro(enable_cxx14)
+    set (CMAKE_CXX_STANDARD 14)
+    set (CMAKE_CXX_STANDARD_REQUIRED ON)
+endmacro()
\ No newline at end of file