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4ee286e8e6
If a platform lacks the support to specify the dynamic library path,
there is no suitable value to give to the CC_LD_DYNPATH variable.
Allow them to be set to an empty string to signal that they do not
need to add the usual -Wl,-rpath, or -R or whatever option followed
by a directory name. This way,
$(call libpath_template,$(SOMELIBDIR))
would expand to just a single mention of that directory, i.e.
-L$(SOMELIBDIR)
when CC_LD_DYNPATH is set to an empty string (or a "-L", which
would have repeated the same "-L$(SOMELIBDIR)" twice without any
ill effect).
Signed-off-by: Junio C Hamano <gitster@pobox.com>
119 lines
3.6 KiB
Makefile
119 lines
3.6 KiB
Makefile
### 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 ($(findstring w,$(firstword -$(MAKEFLAGS))),w)
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PRINT_DIR = --no-print-directory
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else # "make -w"
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NO_SUBDIR = :
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endif
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ifneq ($(findstring s,$(firstword -$(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 ' ' 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_CP = @echo ' ' CP $< $@;
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QUIET_LNCP = @echo ' ' LN/CP $@;
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QUIET_XGETTEXT = @echo ' ' XGETTEXT $@;
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QUIET_MSGINIT = @echo ' ' MSGINIT $@;
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QUIET_MSGFMT = @echo ' ' MSGFMT $@;
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QUIET_MSGMERGE = @echo ' ' MSGMERGE $@;
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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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## Used in "Makefile": SPATCH
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QUIET_SPATCH = @echo ' ' SPATCH $< \>$@;
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QUIET_SPATCH_TEST = @echo ' ' SPATCH TEST $(@:.build/%=%);
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QUIET_SPATCH_CAT = @echo ' ' SPATCH CAT $(@:%.patch=%.d/)\*\*.patch \>$@;
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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 $(@D)))
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endef
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## Getting sick of writing -L$(SOMELIBDIR) $(CC_LD_DYNPATH)$(SOMELIBDIR)?
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## Write $(call libpath_template,$(SOMELIBDIR)) instead, perhaps?
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## With CC_LD_DYNPATH set to either an empty string or to "-L", the
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## the directory is not shown the second time.
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define libpath_template
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-L$(1) $(if $(filter-out -L,$(CC_LD_DYNPATH)),$(CC_LD_DYNPATH)$(1))
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endef
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