From 6c0b7857f9c3c3c727c70570b47848d1709ec284 Mon Sep 17 00:00:00 2001
From: Mario Liebisch <mario.liebisch@gmail.com>
Date: Thu, 22 Sep 2016 15:26:07 +0200
Subject: [PATCH] Added some simple messaging when trying to build under Cygwin

---
 CMakeLists.txt     | 5 +++++
 cmake/Config.cmake | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index aeed46a3b..fe33ac297 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,6 +13,9 @@ endmacro()
 # determine whether to create a debug or release build
 sfml_set_option(CMAKE_BUILD_TYPE Release STRING "Choose the type of build (Debug or Release)")
 
+# Suppress Cygwin legacy warning
+set(CMAKE_LEGACY_CYGWIN_WIN32 0)
+
 # set Android specific options
 
 # define the minimum API level to be used
@@ -31,6 +34,8 @@ if(NOT ANDROID_ABI)
     set(ANDROID_ABI armeabi-v7a)
 endif()
 
+#end of Android specific options
+
 # project name
 project(SFML)
 
diff --git a/cmake/Config.cmake b/cmake/Config.cmake
index 02e45ed06..cff54d002 100644
--- a/cmake/Config.cmake
+++ b/cmake/Config.cmake
@@ -64,6 +64,10 @@ elseif(${CMAKE_SYSTEM_NAME} STREQUAL "Android")
 
     # use the OpenGL ES implementation on Android
     set(OPENGL_ES 1)
+# comparing CMAKE_SYSTEM_NAME with "CYGWIN" generates a false warning depending on the CMake version
+# let's avoid it so the actual error is more visible
+elseif(${CYGWIN})
+    message(FATAL_ERROR "Unfortunately SFML doesn't support Cygwin's 'hybrid' status between both Windows and Linux derivatives.\nIf you insist on using the GCC, please use a standalone build of MinGW without the Cygwin environment instead.")
 else()
     message(FATAL_ERROR "Unsupported operating system or environment")
     return()