From 96c59ff7ed2d6bd0d3b54b655889f7c909fbe3b6 Mon Sep 17 00:00:00 2001
From: Dmitry Marakasov <amdmi3@amdmi3.ru>
Date: Thu, 25 Dec 2014 22:16:41 +0300
Subject: [PATCH] Add checks for useful c++1y features

---
 CMakeLists.txt                          | 13 +++++++++++++
 SDL2pp/Config.hh.in                     |  2 ++
 cmake/CheckCompile.cmake                | 11 +++++++++++
 cmake/attribute_deprecated_test.cc      |  7 +++++++
 cmake/std_experimental_optional_test.cc |  8 ++++++++
 5 files changed, 41 insertions(+)
 create mode 100644 cmake/CheckCompile.cmake
 create mode 100644 cmake/attribute_deprecated_test.cc
 create mode 100644 cmake/std_experimental_optional_test.cc

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 97e6735..a1877ca 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,6 +52,19 @@ IF(SDL2PP_WITH_WERROR)
 	SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${WERROR_FLAG}")
 ENDIF(SDL2PP_WITH_WERROR)
 
+# platform checks
+INCLUDE(CheckCompile)
+CHECK_COMPILE(
+	SDL2PP_WITH_EXPERIMENTAL_OPTIONAL
+	${PROJECT_SOURCE_DIR}/cmake/std_experimental_optional_test.cc
+	"Checking for experimental/optional header"
+)
+CHECK_COMPILE(
+	SDL2PP_WITH_DEPRECATED
+	${PROJECT_SOURCE_DIR}/cmake/attribute_deprecated_test.cc
+	"Checking for [[deprecated]] attribute"
+)
+
 # config.h
 CONFIGURE_FILE(
 	SDL2pp/Config.hh.in
diff --git a/SDL2pp/Config.hh.in b/SDL2pp/Config.hh.in
index ac60ca8..e12670b 100644
--- a/SDL2pp/Config.hh.in
+++ b/SDL2pp/Config.hh.in
@@ -30,5 +30,7 @@
 
 #cmakedefine SDL2PP_WITH_IMAGE
 #cmakedefine SDL2PP_WITH_2_0_4
+#cmakedefine SDL2PP_WITH_EXPERIMENTAL_OPTIONAL
+#cmakedefine SDL2PP_WITH_DEPRECATED
 
 #endif
diff --git a/cmake/CheckCompile.cmake b/cmake/CheckCompile.cmake
new file mode 100644
index 0000000..33e72cb
--- /dev/null
+++ b/cmake/CheckCompile.cmake
@@ -0,0 +1,11 @@
+MACRO(CHECK_COMPILE RESULT_VAR SOURCE_FILE DESCRIPTION)
+	SET(SAVED_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+	SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${WERROR_FLAG}")
+	TRY_COMPILE(${RESULT_VAR} ${CMAKE_BINARY_DIR} ${SOURCE_FILE})
+	IF(${RESULT_VAR})
+		MESSAGE(STATUS "${DESCRIPTION}: yes")
+	ELSE(${RESULT_VAR})
+		MESSAGE(STATUS "${DESCRIPTION}: no")
+	ENDIF(${RESULT_VAR})
+	SET(CMAKE_CXX_FLAGS "${SAVED_CXX_FLAGS}")
+ENDMACRO(CHECK_COMPILE)
diff --git a/cmake/attribute_deprecated_test.cc b/cmake/attribute_deprecated_test.cc
new file mode 100644
index 0000000..fe6b4af
--- /dev/null
+++ b/cmake/attribute_deprecated_test.cc
@@ -0,0 +1,7 @@
+[[deprecated]]
+void f() {
+}
+
+int main() {
+	return 0;
+}
diff --git a/cmake/std_experimental_optional_test.cc b/cmake/std_experimental_optional_test.cc
new file mode 100644
index 0000000..8d77d5d
--- /dev/null
+++ b/cmake/std_experimental_optional_test.cc
@@ -0,0 +1,8 @@
+#include <experimental/optional>
+#include <string>
+
+int main() {
+	std::experimental::optional<std::string> o;
+
+	return !o;
+}