https://codereview.appspot.com/565620043/diff/549530043/GNUmakefile.in File GNUmakefile.in (right):
https://codereview.appspot.com/565620043/diff/549530043/GNUmakefile.in#newcode319 GNUmakefile.in:319: ## TODO: This condition speeds up make when formatting targets are not I would not really work with a timestamp file but rather use git status to detect modified files, so that only those would be affected. That, however, is more a useful approach for a script rather than a Makefile. https://codereview.appspot.com/565620043/diff/549530043/configure.ac File configure.ac (right): https://codereview.appspot.com/565620043/diff/549530043/configure.ac#newcode367 configure.ac:367: STEPMAKE_PROGS(CLANG_FORMAT, clang-format-9 clang-format, OPTIONAL, 9, 9) Interesting. This gives a warning when it isn't installed? I think that we don't usually flag dependencies of components not involved in either building or running LilyPond. For example, we provide Emacs and vi style files without checking for availability of either editor. https://codereview.appspot.com/565620043/
