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Makefile refactoring with a bit of suffixes rule stripping to optimize the runtime overhead. * ab/make-optim-noop: Makefiles: add and use wildcard "mkdir -p" template Makefile: add "$(QUIET)" boilerplate to shared.mak Makefile: move $(comma), $(empty) and $(space) to shared.mak Makefile: move ".SUFFIXES" rule to shared.mak Makefile: define $(LIB_H) in terms of $(FIND_SOURCE_FILES) Makefile: disable GNU make built-in wildcard rules Makefiles: add "shared.mak", move ".DELETE_ON_ERROR" to it scalar Makefile: use "The default target of..." patternmaint
Junio C Hamano
3 years ago
10 changed files with 165 additions and 160 deletions
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### Remove GNU make implicit rules |
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## This speeds things up since we don't need to look for and stat() a |
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## "foo.c,v" every time a rule referring to "foo.c" is in play. See |
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## "make -p -f/dev/null | grep ^%::'". |
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%:: %,v |
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%:: RCS/%,v |
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%:: RCS/% |
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%:: s.% |
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%:: SCCS/s.% |
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## Likewise delete default $(SUFFIXES). See: |
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## |
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## info make --index-search=.SUFFIXES |
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.SUFFIXES: |
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### Flags affecting all rules |
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# A GNU make extension since gmake 3.72 (released in late 1994) to |
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# remove the target of rules if commands in those rules fail. The |
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# default is to only do that if make itself receives a signal. Affects |
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# all targets, see: |
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# |
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# info make --index-search=.DELETE_ON_ERROR |
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.DELETE_ON_ERROR: |
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### Global variables |
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## comma, empty, space: handy variables as these tokens are either |
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## special or can be hard to spot among other Makefile syntax. |
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comma := , |
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empty := |
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space := $(empty) $(empty) |
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### Quieting |
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## common |
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QUIET_SUBDIR0 = +$(MAKE) -C # space to separate -C and subdir |
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QUIET_SUBDIR1 = |
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ifneq ($(findstring w,$(MAKEFLAGS)),w) |
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PRINT_DIR = --no-print-directory |
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else # "make -w" |
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NO_SUBDIR = : |
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endif |
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ifneq ($(findstring s,$(MAKEFLAGS)),s) |
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ifndef V |
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## common |
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QUIET_SUBDIR0 = +@subdir= |
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QUIET_SUBDIR1 = ;$(NO_SUBDIR) echo ' ' SUBDIR $$subdir; \ |
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$(MAKE) $(PRINT_DIR) -C $$subdir |
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QUIET = @ |
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QUIET_GEN = @echo ' ' GEN $@; |
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QUIET_MKDIR_P_PARENT = @echo $(wspfx_SQ) MKDIR -p $(@D); |
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## Used in "Makefile" |
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QUIET_CC = @echo ' ' CC $@; |
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QUIET_AR = @echo ' ' AR $@; |
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QUIET_LINK = @echo ' ' LINK $@; |
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QUIET_BUILT_IN = @echo ' ' BUILTIN $@; |
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QUIET_LNCP = @echo ' ' LN/CP $@; |
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QUIET_XGETTEXT = @echo ' ' XGETTEXT $@; |
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QUIET_MSGFMT = @echo ' ' MSGFMT $@; |
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QUIET_GCOV = @echo ' ' GCOV $@; |
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QUIET_SP = @echo ' ' SP $<; |
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QUIET_HDR = @echo ' ' HDR $(<:hcc=h); |
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QUIET_RC = @echo ' ' RC $@; |
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QUIET_SPATCH = @echo ' ' SPATCH $<; |
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## Used in "Documentation/Makefile" |
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QUIET_ASCIIDOC = @echo ' ' ASCIIDOC $@; |
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QUIET_XMLTO = @echo ' ' XMLTO $@; |
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QUIET_DB2TEXI = @echo ' ' DB2TEXI $@; |
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QUIET_MAKEINFO = @echo ' ' MAKEINFO $@; |
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QUIET_DBLATEX = @echo ' ' DBLATEX $@; |
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QUIET_XSLTPROC = @echo ' ' XSLTPROC $@; |
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QUIET_GEN = @echo ' ' GEN $@; |
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QUIET_STDERR = 2> /dev/null |
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QUIET_LINT_GITLINK = @echo ' ' LINT GITLINK $<; |
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QUIET_LINT_MANSEC = @echo ' ' LINT MAN SEC $<; |
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QUIET_LINT_MANEND = @echo ' ' LINT MAN END $<; |
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export V |
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endif |
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endif |
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### Templates |
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## mkdir_p_parent: lazily "mkdir -p" the path needed for a $@ |
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## file. Uses $(wildcard) to avoid the "mkdir -p" if it's not |
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## needed. |
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## |
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## Is racy, but in a good way; we might redundantly (and safely) |
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## "mkdir -p" when running in parallel, but won't need to exhaustively create |
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## individual rules for "a" -> "prefix" -> "dir" -> "file" if given a |
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## "a/prefix/dir/file". This can instead be inserted at the start of |
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## the "a/prefix/dir/file" rule. |
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define mkdir_p_parent_template |
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$(if $(wildcard $(@D)),,$(QUIET_MKDIR_P_PARENT)$(shell mkdir -p $(@D))) |
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endef |
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