All: under mingw32+msys: fix an issue when using Cmake version >= 2.8.5 which uses by default a response file.

This response file is not expanded under mingw3 2 (mingw/gcc bug?), and the list of include paths, found in this file, is not taken in account.
Now, under mingw32+msys, when not cross-compiling, the response file is disabled.
Cvpcb, Pcbnew: fix a list of libs  which should be added only when cross-compiling:
Previously, they were always added, which creates an issue with mingw/msy/ gcc  2.8.
Now they are added only when cross-compiling (this issue was noticeable only with msys+mingw version  2.8)

CMakeLists.txt

@@ -115,6 +115,26 @@ if( CMAKE_COMPILER_IS_GNUCXX )
     if( MINGW )
         set( CMAKE_EXE_LINKER_FLAGS_RELEASE "-s" )
 
+        # _UNICODE definition seems needed under mingw/gcc 4.8
+        # (Kicad uses unicode, and on Windows, wxWidgets >= 2.9.4 is mandatory
+        # and uses unicode)
+        if( GCC_VERSION VERSION_EQUAL 4.8.0 OR GCC_VERSION VERSION_GREATER 4.8.0 )
+            add_definitions(-D_UNICODE)
+        endif()
+
+        # Since version 2.8.5, Cmake uses a response file (.rsp) to
+        # pass the list of include paths to gcc
+        # unfortunately, under mingw32+msys, at least with gcc 4.8 and previous,
+        # this file is not expanded and include paths defined in this file are not taken in account
+        # this is the case of wxWidgets includes
+        # Disable this response file for includes ( See Windows-GNU.cmake module )
+        if( WIN32 AND MSYS AND NOT CMAKE_CROSSCOMPILING )
+            # fixme: it is needed only with MSYS+MINGW32? or always under MINGW
+            if (${CMAKE_SIZEOF_VOID_P} MATCHES 4)
+                set(CMAKE_CXX_USE_RESPONSE_FILE_FOR_INCLUDES 0)
+            endif()
+        endif()
+
     else()
         # We build DLL/DSOs from static libraries, so create position independent code
         # for all cases, since we do not have DLL/DSO specific static libraries.

cvpcb/CMakeLists.txt

@@ -110,7 +110,7 @@ target_link_libraries( cvpcb
     )
 
 # Only for win32 cross compilation using MXE
-if(WIN32 AND MSYS)
+if( WIN32 AND MSYS AND CMAKE_CROSSCOMPILING )
 target_link_libraries(cvpcb
 	opengl32
 	glu32
@@ -119,7 +119,7 @@ target_link_libraries(cvpcb
 	freetype
 	bz2
 	)
-endif(WIN32 AND MSYS)
+endif()
 
 
 if( BUILD_GITHUB_PLUGIN )

pcbnew/CMakeLists.txt

@@ -235,7 +235,7 @@ set( PCBNEW_CLASS_SRCS
     zones_polygons_test_connections.cpp
     zones_test_and_combine_areas.cpp
     class_footprint_wizard.cpp
-    
+
     tools/selection_tool.cpp
     tools/selection_area.cpp
     tools/bright_box.cpp
@@ -551,7 +551,7 @@ target_link_libraries( pcbnew
     )
 
 # Only for win32 cross compilation using MXE
-if(WIN32 AND MSYS)
+if( WIN32 AND MSYS AND CMAKE_CROSSCOMPILING )
 target_link_libraries(pcbnew
 	opengl32
 	glu32
@@ -560,7 +560,7 @@ target_link_libraries(pcbnew
 	freetype
 	bz2
 	)
-endif(WIN32 AND MSYS)
+endif()
 
 if( MAKE_LINK_MAPS )
     # generate a link map with cross reference