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Makefile: use git ls-files
to list header files, if possible
Ind85b0dff72
(Makefile: use `find` to determine static header dependencies, 2014-08-25), we switched from a static list of header files to a dynamically-generated one, asking `find` to enumerate them. Back in those days, we did not use `$(LIB_H)` by default, and many a `make` implementation seems smart enough not to run that `find` command in that case, so it was deemed okay to run `find` for special targets requiring this macro. However, as ofebb7baf02f
(Makefile: add a hdr-check target, 2018-09-19), $(LIB_H) is part of a global rule and therefore must be expanded. Meaning: this `find` command has to be run upon every `make` invocation. In the presence of many a worktree, this can tax the developers' patience quite a bit. Even in the absence of worktrees or other untracked files and directories, the cost of I/O to generate that list of header files is simply a lot larger than a simple `git ls-files` call. Therefore, just like in335339758c
(Makefile: ask "ls-files" to list source files if available, 2011-10-18), we now prefer to use `git ls-files` to enumerate the header files to enumerating them via `find`, falling back to the latter if the former failed (which would be the case e.g. in a worktree that was extracted from a source .tar file rather than from a clone of Git's sources). This has one notable consequence: we no longer include `command-list.h` in `LIB_H`, as it is a generated file, not a tracked one, but that is easily worked around. Of the three sites that use `LIB_H`, two (`LOCALIZED_C` and `CHK_HDRS`) already handle generated headers separately. In the third, the computed-dependency fallback, we can just add in a reference to $(GENERATED_H). Likewise, we no longer include not-yet-tracked header files in `LIB_H`. Given the speed improvements, these consequences seem a comparably small price to pay. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Acked-by: Ramsay Jones <ramsay@ramsayjones.plus.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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5
Makefile
5
Makefile
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@ -841,7 +841,8 @@ VCSSVN_LIB = vcs-svn/lib.a
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GENERATED_H += command-list.h
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LIB_H = $(shell $(FIND) . \
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LIB_H := $(shell git ls-files '*.h' ':!t/' ':!Documentation/' 2>/dev/null || \
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$(FIND) . \
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-name .git -prune -o \
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-name t -prune -o \
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-name Documentation -prune -o \
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@ -2363,7 +2364,7 @@ else
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# should _not_ be included here, since they are necessary even when
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# building an object for the first time.
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$(OBJECTS): $(LIB_H)
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$(OBJECTS): $(LIB_H) $(GENERATED_H)
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endif
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exec-cmd.sp exec-cmd.s exec-cmd.o: GIT-PREFIX
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