From 8fa25a55af4b17454d0bd93e1758f8c982b91bc1 Mon Sep 17 00:00:00 2001
From: Ralf Habacker <ralf.habacker@freenet.de>
Date: Tue, 14 Jan 2014 20:12:36 +0100
Subject: [PATCH] Give cmake users some hints/requirements when cross compiling
 for Windows on Linux.

---
 cmake/CMakeLists.txt       |  5 +++++
 cmake/modules/Macros.cmake | 26 ++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index c8a6834..fd6c525 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -597,6 +597,11 @@ endif(NOT DBUS_DISABLE_ASSERT)
 if (DBUS_DISABLE_CHECKS)
     message("NOTE: building without checks for arguments passed to public API makes it harder to debug apps using D-BUS, but will slightly decrease D-BUS library size and _very_ slightly improve performance.")
 endif(DBUS_DISABLE_CHECKS)
+
+foreach(_note ${FOOTNOTES})
+    message(${_note})
+endforeach()
+
 MESSAGE(" ")
 
 INCLUDE(modules/CPackInstallConfig.cmake)
diff --git a/cmake/modules/Macros.cmake b/cmake/modules/Macros.cmake
index 545f2e5..fd3f62c 100644
--- a/cmake/modules/Macros.cmake
+++ b/cmake/modules/Macros.cmake
@@ -1,3 +1,29 @@
+if(DBUS_BUILD_TESTS AND CMAKE_CROSSCOMPILING AND CMAKE_SYSTEM_NAME STREQUAL "Windows")
+    if(CMAKE_HOST_SYSTEM_NAME STREQUAL "Linux")
+        find_file(WINE_EXECUTABLE
+            NAMES wine
+            PATHS /usr/bin /usr/local/bin
+            NO_CMAKE_FIND_ROOT_PATH
+        )
+        find_file(HAVE_BINFMT_WINE_SUPPORT
+            NAMES DOSWin wine Wine windows Windows
+            PATHS /proc/sys/fs/binfmt_misc
+            NO_SYSTEM_PATH NO_CMAKE_FIND_ROOT_PATH
+        )
+        if(WINE_EXECUTABLE AND HAVE_BINFMT_WINE_SUPPORT)
+            list(APPEND FOOTNOTES "NOTE: The requirements to run cross compiled applications on your host system are achieved. You may run 'make check'.")
+        endif()
+        if(NOT WINE_EXECUTABLE)
+            list(APPEND FOOTNOTES "NOTE: You may install the Windows emulator 'wine' to be able to run cross compiled test applications.")
+        endif()
+        if(NOT HAVE_BINFMT_WINE_SUPPORT)
+            list(APPEND FOOTNOTES "NOTE: You may activate binfmt_misc support for wine to be able to run cross compiled test applications.")
+        endif()
+    else()
+        list(APPEND FOOTNOTES "NOTE: You will not be able to run cross compiled applications on your host system.")
+    endif()
+endif()
+
 MACRO(TIMESTAMP RESULT)
     if (CMAKE_HOST_SYSTEM_NAME STREQUAL "Windows")
         EXECUTE_PROCESS(COMMAND "cmd" " /C date /T" OUTPUT_VARIABLE DATE)
-- 
1.8.4