Include what you use (IWYU) Restriced/NotForLicensees/Source/ThirdParty/IWYU The software is used to clean up source code. You build all the code with this tool (which is an extension on top of clang) to build a database. we then have our own code using this database to fixup source code https://github.com/include-what-you-use/include-what-you-use/blob/master/LICENSE.TXT Licensees Git P4