From e1c69c277ea6005cc358434679b83fa1cb752756 Mon Sep 17 00:00:00 2001

From: =?UTF-8?q?Dan=20Vr=C3=A1til?= <dvratil@redhat.com>

Date: Tue, 23 Sep 2014 18:00:34 +0200

Subject: [PATCH 09/30] Test whether compiler supports all required C++11

 features at configure time

To prevent ugly compilation errors when someone tries to compile Akonadi

with a compiler that does not support all C++11 features we use, we run

a try_compile check in CMakeLists.txt.

---

 CMakeLists.txt | 18 ++++++++++++++++++

 1 file changed, 18 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt

index e081d23..2d790c9 100644

--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -216,6 +216,24 @@ if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_C_COMPILER MATCHES "icc" OR (CMAKE_CXX_COMP

   set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -Wno-long-long -std=iso9899:1990 -Wundef -Wcast-align -Werror-implicit-function-declaration -Wchar-subscripts -Wall -Wextra -Wpointer-arith -Wwrite-strings -Wformat-security -Wmissing-format-attribute -fno-common")

   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x -Wnon-virtual-dtor -Wundef -Wcast-align -Wchar-subscripts -Wall -Wextra -Wpointer-arith -Wformat-security -fno-common")

+  file(WRITE ${CMAKE_BINARY_DIR}/cxx11_check.cpp

+       "enum Enum { Value = 1 };

+        struct Class {

+            Class(int val) { (void)val; };

+            // Delegating constructor

+            Class(): Class(42) {};

+            // New-style enumerator

+            Class(Enum e = Enum::Value) { (void)e; };

+        };

+        int main() {}

+       ")

+  try_compile(CXX11_SUPPORTED

+              ${CMAKE_BINARY_DIR}/cxx11_check

+              ${CMAKE_BINARY_DIR}/cxx11_check.cpp)

+  if (NOT CXX11_SUPPORTED)

+      message(FATAL_ERROR "Compiler does not support all required C++11 features")

+  endif()

+

   # debugfull target

   set(CMAKE_CXX_FLAGS_DEBUGFULL "-g3 -fno-inline" CACHE STRING "Flags used by the C++ compiler during debugfull builds." FORCE)

   set(CMAKE_C_FLAGS_DEBUGFULL   "-g3 -fno-inline" CACHE STRING "Flags used by the C compiler during debugfull builds." FORCE)

-- 

2.1.0