Fix CMake/wxWidgets link issue

This corrects linking of the wxWidgets libraries when there's multiple
copies and the desired one is later in the search path.  This can affect
any non-Windows system that doesn't have it's wxWidgets in "standard"
libraries (like our wxWidgets builds on the Mac).

The wrong wxWidgets libraries can be picked up by the linker if other
"-L" arguments appear before the wxWidgets specific on.  This can happen
if you have something like Homebrew installed and CMake finds one of the
libraries (like libogg) installed.  It will put a "-L/usr/local/lib" in
the linker arguments before the "-L/usr/local/x86_64" wxWidgets flag,
and if there happens to be wxWidgets libs in /usr/local/lib, the linker
will pull the wxWidgets libs from /usr/local/lib...not what was wanted.

CMakeLists.txt

@@ -22,6 +22,9 @@ endif()
 # Ignore COMPILE_DEFINITIONS_<Config> properties
 cmake_policy( SET CMP0043 NEW )
 
+# Link libraries by full path even in implicit directories.
+cmake_policy( SET CMP0060 NEW )
+
 # ``INTERPROCEDURAL_OPTIMIZATION`` is enforced when enabled.
 cmake_policy( SET CMP0069 NEW )
 

cmake-proxies/cmake-modules/FindwxWidgets.cmake

@@ -944,6 +944,7 @@ else()
 endif()
 
 # Check that all libraries are present, as wx-config does not check it
+set(_wx_libraries "")
 set(_wx_lib_missing "")
 foreach(_wx_lib_ ${wxWidgets_LIBRARIES})
   if("${_wx_lib_}" MATCHES "^-l(.*)")
@@ -952,10 +953,16 @@ foreach(_wx_lib_ ${wxWidgets_LIBRARIES})
     find_library(_wx_lib_found NAMES ${_wx_lib_name} HINTS ${wxWidgets_LIBRARY_DIRS})
     if(_wx_lib_found STREQUAL _wx_lib_found-NOTFOUND)
       list(APPEND _wx_lib_missing ${_wx_lib_name})
+    else()
+      list(APPEND _wx_libraries ${_wx_lib_found})
     endif()
     unset(_wx_lib_found CACHE)
+  else()
+    list(APPEND _wx_libraries ${_wx_lib_})
   endif()
 endforeach()
+set(wxWidgets_LIBRARIES ${_wx_libraries})
+unset(_wx_libraries)
 
 if (_wx_lib_missing)
   string(REPLACE ";" " " _wx_lib_missing "${_wx_lib_missing}")