Find the GCC-XML front-end executable.
This module will define the following variables:
GCCXML - the GCC-XML front-end executable.
© 2000–2016 Kitware, Inc.
© 2000–2011 Insight Software Consortium
Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.7/module/FindGCCXML.html