Remove all mentions of GCC < 4.7 and MSVC < 2015 compatibility.

No longer I'm willing to go through that pain.

CMakeLists.txt

@@ -163,15 +163,6 @@ if(BUILD_TESTS)
     enable_testing()
 endif()
 
-# Check compiler compatibility
-if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.7.0")
-    message(FATAL_ERROR "Compatibility branch of Magnum is needed for use with GCC < 4.7. See the documentation for more information.")
-elseif(MSVC)
-    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "19.0")
-        message(FATAL_ERROR "Compatibility branch of Magnum is needed for use with MSVC < 2015. See the documentation for more information.")
-    endif()
-endif()
-
 # If targeting NaCl, set explicit OpenGL ES 2.0 support. For Android and
 # Emscripten the decision between ES 2.0 / WebGL 1.0 and ES 3.0 / WebGL 2.0
 # must be done by the user.

README.md

@@ -89,11 +89,9 @@ comprehensive guide for building, packaging and crosscompiling.
 Minimal dependencies
 --------------------
 
--   C++ compiler with good C++11 support. Compilers which are tested to have
-    everything needed are **GCC** >= 4.7, **Clang** >= 3.1 and **MSVC** 2015.
-    On Windows you can also use **MinGW-w64**. GCC 4.6, 4.5, 4.4 and MSVC 2013
-    support involves some ugly workarounds and thus is available only in
-    `compatibility` branch.
+*   C++ compiler with good C++11 support. Compilers which are tested to have
+    everything needed are **GCC** >= 4.7, **Clang** >= 3.1 and **MSVC** >=
+    2015. On Windows you can also use **MinGW-w64**.
 *   **CMake** >= 2.8.12
 *   **Corrade** - Plugin management and utility library. You can get it at
     https://github.com/mosra/corrade.

doc/building.dox

@@ -33,10 +33,8 @@ namespace Magnum {
 Minimal set of tools and libraries required for building is:
 
 -   C++ compiler with good C++11 support. Compilers which are tested to have
-    everything needed are **GCC** >= 4.7, **Clang** >= 3.1 and **MSVC** 2015.
-    On Windows you can also use **MinGW-w64**. GCC 4.6, 4.5, 4.4 and MSVC 2013
-    support involves some ugly workarounds and thus is available only in
-    `compatibility` branch.
+    everything needed are **GCC** >= 4.7, **Clang** >= 3.1 and **MSVC** >=
+    2015. On Windows you can also use **MinGW-w64**.
 -   **CMake** >= 2.8.12
 -   **Corrade** - Plugin management and utility library. See
     @ref building-corrade "Corrade download and installation guide" for more
@@ -52,12 +50,6 @@ compressed archive or use the command line:
 
     git clone git://github.com/mosra/magnum.git
 
-If you need to use the `compatibility` branch, check it out as following from
-the cloned repository or download the particular archive from
-https://github.com/mosra/magnum/tree/compatibility.
-
-    git checkout compatibility
-
 @section building-compilation Compilation, installation
 
 Relevant information about CMake usage was described in
@@ -103,8 +95,7 @@ value to that directory (e.g. `-DCMAKE_INSTALL_PREFIX=C:/Sys`).
 
 @subsubsection building-windows-msvc Using Visual Studio
 
-On Windows CMake by default creates Visual Studio project files. You need to
-use `compatibility` branch to compile with MSVC 2013, as said above.
+On Windows CMake by default creates Visual Studio project files.
 
 The most straightforward way to build and install the library is again via the
 command-line. The bonus point is that you don't even need to wait for Visual

doc/getting-started.dox

@@ -59,14 +59,6 @@ dependencies means just cloning them into your project tree:
     git clone git://github.com/mosra/corrade.git
     git clone git://github.com/mosra/magnum.git
 
-The `master` branch supports GCC 4.7+, Clang and MSVC 2015 compilers, for older
-versions you need to use `compatibility` branches, please see
-@ref building-corrade "Corrade" and @ref building "Magnum"  installation guides
-for detailed information. If you are using `compatibility` branch of Magnum and
-Corrade, replace `modules/FindCorrade.cmake` from the bootstrap project with
-[the one from compatibility branch](https://github.com/mosra/corrade/blob/compatibility/modules/FindCorrade.cmake)
-so the compatibility mode gets properly detected and used.
-
 Then open the `CMakeLists.txt` file in the root of bootstrap project and add
 these two new subdirectories using `add_subdirectory()` so the file looks like
 this: