Require cmake 3.1.0 and C++11.

We plan to use C++11 features in the future. Moreover, recent gtkmm
has a hard requirement on C++11.

.travis.yml

@@ -3,10 +3,10 @@ os:
   - linux
   - osx
 install:
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo add-apt-repository -y ppa:smspillaz/cmake-2.8.12; sudo add-apt-repository -y ppa:ondrej/php5; sudo apt-get update -qq; sudo apt-get install -q -y cmake cmake-data libpng12-dev zlib1g-dev libjson0-dev libfontconfig1-dev libgtkmm-2.4-dev libpangomm-1.4-dev libgl1-mesa-dev libglu-dev libglew-dev; fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo add-apt-repository -y ppa:smspillaz/cmake-master; sudo add-apt-repository -y ppa:ondrej/php5; sudo apt-get update -qq; sudo apt-get install -q -y cmake cmake-data libpng12-dev zlib1g-dev libjson0-dev libfontconfig1-dev libgtkmm-2.4-dev libpangomm-1.4-dev libgl1-mesa-dev libglu-dev libglew-dev; fi
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install cmake libpng; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update; brew upgrade cmake libpng; fi
 script:
   - mkdir cbuild
   - cd cbuild
-  - cmake -DCMAKE_BUILD_TYPE=Debug ..
+  - cmake -DCMAKE_OSX_DEPLOYMENT_TARGET=10.7  -DCMAKE_BUILD_TYPE=Debug ..
   - make

CMakeLists.txt

@@ -1,9 +1,11 @@
 # cmake configuration
 
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.1.0 FATAL_ERROR)
-cmake_policy(VERSION 2.8.12)
+cmake_policy(VERSION 3.1.0)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH}
     "${CMAKE_SOURCE_DIR}/cmake/")
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED YES)
 
 include(CheckIncludeFile)
 
@@ -24,7 +26,7 @@ if(WIN32)
     set(DISABLE_TTF2C CACHE BOOL "Disable font regeneration with ttf2c, for use on CI")
 endif()
 
-if(NOT WIN32)
+if(NOT WIN32 AND NOT APPLE)
     set(GUI gtk2 CACHE STRING "GUI toolkit to use (one of: gtk2 gtk3)")
 endif()
 
@@ -41,15 +43,19 @@ if(WIN32)
         -DWIN32_LEAN_AND_MEAN=1)
 endif()
 
-if((CMAKE_CXX_PLATFORM_ID STREQUAL "Linux") AND CMAKE_COMPILER_IS_GNUCC)
-    set(CMAKE_EXE_LINKER_FLAGS "-Wl,--as-needed ${CMAKE_EXE_LINKER_FLAGS}")
-endif()
-
 if(MINGW)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -static-libgcc")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static-libgcc -static-libstdc++")
 endif()
 
+if(APPLE)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
+endif()
+
+if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+    set(CMAKE_EXE_LINKER_FLAGS "-Wl,--as-needed ${CMAKE_EXE_LINKER_FLAGS}")
+endif()
+
 # dependencies
 
 CHECK_INCLUDE_FILE("stdint.h" HAVE_STDINT_H)

src/CMakeLists.txt

@@ -131,7 +131,6 @@ if(WIN32)
         comctl32)
 elseif(APPLE)
     add_definitions(
-        -mmacosx-version-min=10.6
         -fobjc-arc)
 
     set(platform_SOURCES
@@ -327,8 +326,6 @@ if(SPACEWARE_FOUND)
 endif()
 
 if(APPLE)
-    set_target_properties(solvespace PROPERTIES INSTALL_RPATH ON)
-
     set(fixups)
     foreach(lib ${platform_BUNDLED_LIBS})
         execute_process(COMMAND otool -XD ${lib}

src/cocoa/cocoamain.mm

@@ -489,7 +489,8 @@ bool FullScreenIsActive(void) {
 }
 
 void ShowGraphicsEditControl(int x, int y, char *str) {
-    [GWView startEditing:[NSString stringWithUTF8String:str] at:(NSPoint){x, y}];
+    [GWView startEditing:[NSString stringWithUTF8String:str]
+            at:(NSPoint){(CGFloat)x, (CGFloat)y}];
 }
 
 void HideGraphicsEditControl(void) {
@@ -1011,7 +1012,8 @@ void SetMousePointerToHand(bool is_hand) {
 }
 
 void ShowTextEditControl(int x, int y, char *str) {
-    return [TWView startEditing:[NSString stringWithUTF8String:str] at:(NSPoint){x, y}];
+    return [TWView startEditing:[NSString stringWithUTF8String:str]
+                   at:(NSPoint){(CGFloat)x, (CGFloat)y}];
 }
 
 void HideTextEditControl(void) {