VVVVVV/desktop_version/src/Version.h

#ifndef VERSION_H
#define VERSION_H

#ifdef VERSION_H_OUT_EXISTS
#include "Version.h.out"
#endif

#endif /* VERSION_H */
Don't recompile all files when the commit hash is changed The previous implementation of showing the commit hash on the title screen used a preprocessor definition added at CMake time to pass the hash and date. This was passed for every file compiled, so if the date or hash changed, then every file would be recompiled. This is especially annoying if you're working on the game and switching branches all the time - the game has at least 50 source files to recompile! To fix this, we'll switch to using a generated file, named Version.h.out, that only gets included by the necessary files (which there is only one of - Render.cpp). It will be autogenerated by CMake (by using CONFIGURE_FILE(), which takes a templated file and does a find-and-replace on it, not unlike C macros), and since there's only one file that includes it, only one file will need to be recompiled when it changes. And also to prevent Version.h.out being a required file, it will only be included if necessary (i.e. OFFICIAL_BUILD is off). Since the C preprocessor can't ignore non-existing include files and will always error on them, I wrapped the #include in an #ifdef VERSION_H_EXISTS, and CMake will add the VERSION_H_OUT_EXISTS define when generating Version.h.out. The wrapper is named Version.h, so any file that #includes the commit hash and date should #include Version.h instead of Version.h.out. As an added bonus, I've also made it so CMake will print "This is interim commit [HASH] (committed [DATE])" at configure time if the game is going to be compiled with an interim commit hash. Now, there is also the issue that the commit hash change will only be noticed in the first place if CMake needs to be re-ran for anything, but that's a less severe issue than requiring recompilation of 50(!) or so files. 2020-12-26 00:24:48 +01:00			`#ifndef VERSION_H`
			`#define VERSION_H`

			`#ifdef VERSION_H_OUT_EXISTS`
			`#include "Version.h.out"`
			`#endif`

			`#endif /* VERSION_H */`