[TUHS] Re: Version 256 of systemd boasts '42% less Unix philosophy' The Register

[Warner Losh <imp@bsdimp.com>]

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On Wed, Jun 19, 2024, 7:28 AM Larry McVoy <lm@mcvoy.com> wrote:

> On Tue, Jun 18, 2024 at 07:46:15PM -0500, Nevin Liber wrote:
> > But I'll bite.  There was the claim by Larry McVoy that "Writing
> Makefiles
> > isn't that hard".
> >
> > Please show these beautiful makefiles for a non-toy non-trivial product
>
> Works on *BSD, MacOS, Windows, Linux on a bunch of different architectures,
> Solaris, HPUX, AIX, IRIX, Tru64, etc.
>

The posted Makefile is no a strictly conforming POSIX Makefile, but uses
gmake extensions extensively... And eyes of the beholder may vary...

Warner

# Copyright 1999-2016 BitMover, Inc
>
> # Licensed under the Apache License, Version 2.0 (the "License");
> # you may not use this file except in compliance with the License.
> # You may obtain a copy of the License at
>
> #     http://www.apache.org/licenses/LICENSE-2.0
>
> # Unless required by applicable law or agreed to in writing, software
> # distributed under the License is distributed on an "AS IS" BASIS,
> # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
> # See the License for the specific language governing permissions and
> # limitations under the License.
>
> # Makefile for BitKeeper.
>
> # Bitmover makefiles try to provide the following targets:
> #
> # all           build everything under the current directory
> #
> # clean         remove all objects and programs
> #
> # clobber       run clean plus 'bk -r. clean'
> #
> # srcs          bk get all sources in current directory
> #
> # tags          build ctags for all srcs (only needed in this (top)
> makefile)
> #
> # tags.local    build ctags for srcs under current directory relative to
> top
> #
> #---
> # Special make variables commonly used this makefile:
> #   $@  target
> #   $^  all sources
> #   $<  first source
>
> INSTALLED_BK    ?= $(shell bash -c "cd / && command -v bk")
> INREPO  ?= $(shell bash -c "test -d ../.bk && echo true || echo false")
> HERE    := $(shell pwd)
> ROOT    := $(shell dirname $(HERE))
> REPO    := $(notdir $(ROOT))
> URL     := $(shell echo bk://work/$(ROOT) | sed s,/home/bk/,,)
> LOG     = $(shell echo LOG-`bk getuser`)
> OSTYPE  := $(shell bash -c 'echo $$OSTYPE')
>
> include conf.mk
>
> ## Which hosts are used for producing nightly builds
> NIGHTLY_HOSTS   := macos106 win7-vm debian40 debian40-64
>
> ifeq "$(OSTYPE)" "msys"
>         SYS=win32
>         EXE=.exe
>         XTRA=win32
>         ifeq (,$(INSTALLED_BK))
>                 # BINDIR should really be :C:/Program Files/BitKeeper
>                 # The shell can not handle space in pathname, so
>                 # we use the short name here
>                 BINDIR := "C:/PROGRA~1/BITKEE~1"
>         else
>                 BINDIR := $(shell bk pwd -s "`bk _registry get
> 'HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion'
> ProgramFilesDir`/BitKeeper")
>         endif
>         INSTALL=installdir
>         RESOURCE=bkres.o
>         UWT_C=$(patsubst %,win32/uwtlib/%.c, wapi_intf wcrt_intf)
>         BKGUI=bkg$(EXE)
>         BKG_O=bkg.o
> else
>         SYS=unix
>         EXE=
>         # You can set this to anywhere you like and do a
>         # build production" and you'll have an installed BitKeeper.
>         ifeq (,$(INSTALLED_BK))
>                 BINDIR := /usr/local/bitkeeper
>         else
>                 BINDIR := $(shell "$(INSTALLED_BK)" bin)
>         endif
>         INSTALL=install
>         RESOURCE=
> endif
>
> # By default, we don't print verbose output. If you want to see
> # the full compiler command line, use 'make V=1'
> # The trick is to do "$(Q)$(CC)" instead of just "$(CC)" so that if
> # Q is not set, it's just "$(CC)" and if Q is set to @ it becomes
> # a quiet "@$(CC)".
> # For the verbose messages, gmake provides
> # $(if $(Q),<then>,<else>)
> # so we just conditionalize on Q. Empty is false.
> ifndef V
>         Q=@
>         export Q
> endif
>
> BK=./bk$(EXE)
> G       =-g
> TRIAL   =0
> IMGDIR  =$(HERE)/tmp/bitkeeper
>
> # Handle warning arguments in GCC
> #
> # -Wall enables a bunch of warnings by default
> # -Wno-parentheses shuts up "suggest parentheses around assignment ...".
> #  Unfortunately it also turns off dangling else warnings.
> # -Wno-char-subscripts shuts up "subscript has type char", which comes
> #  up all the time with broken <ctype.h> implementations.
> #  (renabled in GCC3 since it supresses warnings in system files by
> default)
> # -Wno-format-y2k supresses complains about '%y' in strftime formats
> # -Wstrict-prototypes    Don't allow non-ansi function declarations
> WARNINGS=-Wall -Wno-parentheses -Wno-char-subscripts -Wno-format-y2k \
>         -Wstrict-prototypes
>
> # Warnings enabled with GCC newer than 3.0
> #
> # -Wredundant-decls       Declaring same function twice
> # -Wmissing-declarations  Functions without a prototype
> WARNINGS_GCC3=-Wchar-subscripts -Wredundant-decls -Wmissing-declarations
>
> # Warnings enabled with GCC newer than 4.0
> #
> # -Wextra  enable a bunch of random things (called -Wextra in newer gccs)
> # -Wno-pointer-sign  Suppress warnings about changing the signs of pointers
> # -Wno-sign-compare  Suppress warnings about comparing signed and unsigned
> vars
> # -Wno-unsed-parameter Support warnings about function parameters that are
> #  no used
> # -Wno-missing-field-initializers
> # -Wdeclaration-after-statement Warn if someone does a C++ thing of
> declaring
> #  a variable in the middle of a block
> WARNINGS_GCC4=-Wextra -Wno-pointer-sign -Wno-sign-compare \
>         -Wno-unused-parameter -Wno-missing-field-initializers \
>         -Wdeclaration-after-statement -Wpointer-arith
>
> # Warnings enabled with GCC newer than 5.0
> #
> # -Wno-unusedr-esult Do not warn if a caller ignores return value
> WARNINGS_GCC5=-Wno-unused-result
>
> WARNINGS_GCC6= -Wno-misleading-indentation
>
> # XXX could not get -Wimplicit-fallthrough=3 to work
> WARNINGS_GCC7= -Wno-implicit-fallthrough
>
> # Other options to consider enabling in the future:
> #
> # -Wnested-externs Prototypes declared in a function
> # -Wwrite-string warn in string constant is passed to a char *
> # -Wmissing-prototypes
> # -Wunused-parameter
> # -Wold-style-definition Would be nice, but zlib falls all over here
>
> GCC_MAJOR_REV=$(shell $(CC) -dumpversion | sed 's/\..*//')
> GCC_MINOR_REV=$(shell $(CC) -dumpversion | sed 's/.*\.//')
> ifeq ($(GCC_MAJOR_REV),3)
>         WARNINGS += $(WARNINGS_GCC3)
> endif
> ifeq ($(GCC_MAJOR_REV),4)
>         WARNINGS += $(WARNINGS_GCC3) $(WARNINGS_GCC4)
>         ifeq ($(shell expr $(GCC_MINOR_REV) \> 5), 1)
>                 WARNINGS += -Wno-unused-result
>         endif
> endif
> ifeq ($(GCC_MAJOR_REV),5)
>         WARNINGS += $(WARNINGS_GCC3) $(WARNINGS_GCC4) $(WARNINGS_GCC5)
> endif
> ifeq ($(GCC_MAJOR_REV),6)
>         WARNINGS += $(WARNINGS_GCC3) $(WARNINGS_GCC4) $(WARNINGS_GCC5) \
>                     $(WARNINGS_GCC6)
> endif
> ifeq ($(GCC_MAJOR_REV),7)
>         WARNINGS += $(WARNINGS_GCC3) $(WARNINGS_GCC4) $(WARNINGS_GCC5) \
>                     $(WARNINGS_GCC6) $(WARNINGS_GCC7)
> endif
> ifeq ($(GCC_MAJOR_REV),8)
>         WARNINGS += $(WARNINGS_GCC3) $(WARNINGS_GCC4) $(WARNINGS_GCC5) \
>                     $(WARNINGS_GCC6) $(WARNINGS_GCC7) $(WARNINGS_GCC8)
> endif
>
> TRACE = -DUSE_TRACE
>
> ifeq ($(shell uname -s), Darwin)
>         XLIBS += -lresolv
>         G       += -DNOPROC
> endif
>
> ifeq (clang, $(findstring clang, $(shell $(CC) --version)))
>         WARNINGS += -Wno-unused-value -Wno-empty-body -Wno-self-assign
> endif
>
> GCCOPTS=
> CC_DEBUG=$(GCCOPTS) $G $(WARNINGS) $(TRACE)
> CC_FAST_DEBUG=$(GCCOPTS) $G -O2 $(WARNINGS) $(TRACE)
> CC_FAST =$(CC_FAST_DEBUG)
> CC_WALL=$(GCCOPTS) $G -DLINT $(WARNINGS) $(TRACE)
> BINS    = $(BK) $(BKGUI)
>
> # List of all objects in bk other than bk.o. Keep it sorted.
> # But put bkver.o/cmd.o first, they generate headers.
> OBJ =   bkver.o cmd.o \
>         abort.o adler32.o alias.o admin.o annotate.o attributes.o \
>         bam.o bisect.o bkd.o bkd_bam.o bkd_cd.o \
>         bkd_changes.o bkd_client.o bkd_clone.o bkd_cmdtab.o \
>         bkd_findkey.o bkd_http.o \
>         bkd_id.o bkd_kill.o bkd_level.o bkd_misc.o bkd_nested.o \
>         bkd_partition.o bkd_pull.o bkd_push.o bkd_pwd.o \
>         bkd_r2c.o \
>         bkd_rclone.o bkd_rootkey.o bkd_status.o bkd_synckeys.o
> bkd_version.o \
>         bkverinfo.o \
>         cat.o cfile.o changes.o config.o \
>         check.o checksum.o clean.o cleanpath.o clone.o \
>         cmdlog.o \
>         collapse.o comment.o comments.o commit.o comps.o compress.o \
>         contrib/cat.o \
>         contrib/test.o \
>         converge.o \
>         cp.o \
>         crypto.o \
>         cset.o cset_inex.o csetprune.o csets.o cweave.o \
>         dataheap.o dbfile.o delta.o diff.o dspec.o \
>         export.o \
>         fast-import.o fast-export.o features.o findmerge.o \
>         find.o findcset.o fixtool.o fsl.o fslayer.o \
>         g2bk.o gca.o get.o gethelp.o \
>         gethost.o gettemp.o getuser.o gfiles.o glob.o \
>         gnupatch.o graft.o grep.o \
>         hash_nokey.o \
>         heapdump.o help.o here.o here_check.o hostme.o http.o \
>         idcache.o isascii.o info.o \
>         key2rev.o key2path.o kill.o kv.o \
>         libcommit.o libdiff.o libgraph.o librange.o \
>         libsfiles.o lines.o \
>         localtm.o lock.o locking.o \
>         mail.o merge.o mklock.o \
>         mailslot.o \
>         mtime.o mv.o names.o ndiff.o nested.o newroot.o \
>         opark.o \
>         parent.o park.o partition.o \
>         patch.o \
>         pending.o preference.o proj.o \
>         poly.o \
>         populate.o \
>         port/bkd_server.o \
>         port/check_rsh.o \
>         port/gethomedir.o \
>         port/gethost.o port/getinput.o \
>         port/getrealname.o port/getrusage.o port/globalroot.o port/gui.o \
>         port/hostColonPath.o port/http_proxy.o \
>         port/mail.o port/mnext.o port/networkfs.o \
>         port/notifier.o port/ns_sock_host2ip.o port/platforminit.o \
>         port/sccs_getuser.o port/sccs_lockfile.o \
>         port/startmenu.o \
>         port/svcinfo.o \
>         port/uninstall.o \
>         progress.o \
>         prs.o pull.o push.o pwd.o \
>         randombits.o randseed.o range.o rcheck.o rclone.o \
>         rcs2bk.o rcsparse.o \
>         receive.o redblack.o regex.o registry.o renumber.o \
>         remap.o remote.o \
>         repo.o repos.o repogca.o repostats.o repotype.o \
>         resolve.o resolve_binaries.o resolve_contents.o \
>         resolve_create.o resolve_filetypes.o \
>         resolve_flags.o resolve_generic.o resolve_modes.o \
>         resolve_renames.o resolve_tags.o restore.o review.o \
>         rm.o rmdel.o rmgone.o \
>         root.o rset.o sane.o scat.o sccs.o sccs2bk.o \
>         sccslog.o sccs_mv.o search.o sec2hms.o send.o sendbug.o \
>         set.o setup.o sfio.o shrink.o sinfo.o \
>         slib.o smerge.o sort.o startmenu.o \
>         stat.o stattest.o status.o stripdel.o synckeys.o \
>         tagmerge.o testcode.o tclsh.o takepatch.o \
>         testdates.o time.o timestamp.o touch.o trigger.o \
>         unbk.o undo.o undos.o unedit.o \
>         unique.o uninstall.o unlink.o unlock.o unpull.o unrm.o unwrap.o
> upgrade.o \
>         urlinfo.o \
>         utils.o uu.o what.o which.o \
>         xfile.o xflags.o \
>         zone.o
> SCRIPTS = bk.script import \
>         uuwrap unuuwrap gzip_uuwrap ungzip_uuwrap \
>         b64wrap unb64wrap gzip_b64wrap ungzip_b64wrap
> PSCR    = t/doit t/guitest
> PROGS   = libc/mtst$(EXE)
> LIBS    = libc/libc.a
> DATA    = bkmsg.txt bkhelp.txt version \
>         ../doc/bk_refcard.ps ../doc/bk_refcard.pdf ../RELEASE-NOTES.md \
>         dspec-changes dspec-changes-3.2 dspec-changes-4.0 dspec-changes-h \
>         dspec-changes-hv dspec-changes-json dspec-changes-json-v \
>         dspec-changes-vv dspec-log dspec-prs
>
> CONTRIB = gui/ide/emacs/vc-bk.el contrib/git2bk.l
> ALL     = PCRE $(LIBS) $(BINS) $(SCRIPTS) $(PSCR) $(XTRA) \
>         $(PROGS) L-clean GUI L-doc $(DATA)
>
> CFLAGS  = $(CC_DEBUG)
> export CFLAGS
> CPPFLAGS= -Ilibc $(TOMCRYPT_CPPFLAGS) $(TOMMATH_CPPFLAGS) \
>         $(PCRE_CPPFLAGS) $(LZ4_CPPFLAGS) $(ZLIB_CPPFLAGS)
> # Override this if you don't have it.
> RANLIB  = ranlib
>
> # list of C sources in bk
> SRCS    = bk.c $(OBJ:.o=.c)
> # list of headers in bk
> HDRS    = bam.h bkd.h bk-features.h config.h configvars.def diff.h
> fsfuncs.h \
>           graph.h nested.h \
>           progress.h range.h rcs.h resolve.h sccs.h \
>           cmd.h poly.h proj.h redblack.h libc/system.h xfile.h
>
> # list of non-C sources in bk
> SCRSRCS = bk.sh import.sh kwextract.pl uuwrap.sh unuuwrap.sh \
>           port/unix_platform.sh port/win32_platform.sh \
>           gzip_uuwrap.sh ungzip_uuwrap.sh \
>           substvars.sh b64wrap.sh gzip_b64wrap.sh \
>           unb64wrap.sh ungzip_b64wrap.sh
> MISC    = bkmsg.doc t/doit.sh
>
> default:
>         $(MAKE) p
>
> SUBDIRS = libc $(shell ls -d tomcrypt tommath 2>/dev/null)
>
> all: $(ALL)
>
> prof:
>         $(MAKE) CFLAGS="$G -pg -O2" LDFLAGS=-pg all
> gprof:
>         $(MAKE) CFLAGS="$G -DPROFILE -pg -O2" LDFLAGS=-pg all
> ggprof:
>         $(MAKE) CFLAGS="$G -DPROFILE -pg" LDFLAGS=-pg all
> # Debugging...
> d:
>         $(MAKE) CFLAGS="$G -DDEBUG" all
> debug:
>         $(MAKE) CFLAGS="$G -DDEBUG" all
> debug2:
>         $(MAKE) CFLAGS="$G -DDEBUG2" all
>
> gWall Wall:
>         $(MAKE) CFLAGS="$(CC_WALL)" all
>
> # production builds
> p:  ## Build a production version of BitKeeper (no -g)
>         $(MAKE) CFLAGS="$(CC_FAST) $(CF)" all
>
> trial:
>         $(MAKE) TRIAL="3*WEEK" CFLAGS="$(CC_FAST) $(CF)" all
>
> trial3M:
>         $(MAKE) TRIAL="3*MONTH" CFLAGS="$(CC_FAST) $(CF)" all
>
> g:  ## Build a debug version of BitKeeper (-g)
>         $(MAKE) CFLAGS="$(CC_DEBUG)" all
> gO:
>         $(MAKE) CFLAGS="$(CC_FAST_DEBUG)" all
> gcov:
>         $(MAKE) CFLAGS="$(CC_DEBUG) -fprofile-arcs -ftest-coverage" all
>
> clean: L-clean FORCE  ## Remove object files and executables
>         $(if $(Q),@echo Cleaning up,)
>         $(Q)for sub in $(SUBDIRS) ../doc ../man gui utils win32 t t/win32;
> \
>         do      $(MAKE) -C$$sub "CFLAGS=$(CFLAGS)" $@; \
>         done
>         $(Q)$(RM) $(OBJ) bk.o $(BKG_O) $(BINS) $(SCRIPTS) \
>             $(PSRC) $(PROGS)
>         $(Q)$(RM) tags TAGS tags.local cscope.out substvars a.out cmd.c
> cmd.h \
>                 core *.bb *.bbg *.da *.gcov \
>                 bk.ico \
>                 bkmsg.txt bkhelp.txt bkver.c version \
>                 t/doit t/guitest kw2val_lookup.c bkres.o svcmgr.exe \
>                 conf.mk
>         $(Q)$(RM) -r tmp
> ifeq "$(OSTYPE)" "msys"
>         $(Q)$(RM) -rf gnu/bin gnu/doc gnu/etc gnu/share
>         $(Q)$(RM) -f gnu/m.ico gnu/msys.bat gnu/msys.ico
>         $(Q)-rmdir gnu/tmp
>         $(Q)-rmdir gnu
> endif
> ifeq (true,$(INREPO))
> ifneq (,$(INSTALLED_BK))
>         $(Q)EXTRALIST=`"$(INSTALLED_BK)" -Aax | \
>                 grep -v '~$$\|conf-.*\.mk$$'` ; \
>         if [ "$$EXTRALIST" ]; then \
>                 echo "Clean left behind the following files:" ; \
>                 for file in $$EXTRALIST; do \
>                         echo "  $$file" ; \
>                 done ; \
>         else \
>                 echo Clean complete ; \
>         fi
> endif
> endif
>
> clobber: clean FORCE ## Same as 'clean' but also bk clean files
>         -@$(BK) -A clean
>
> # XXX subdirs? (see tags)
> wc: $(HDRS) $(SRCS) $(SCRSRCS) $(MISC)
>         wc -l $(SRCS) $(HDRS) $(SCRSRCS) $(MISC)
>
> get-e: FORCE
>         -@$(BK) edit -qT `echo $(HDRS) $(SRCS) $(SCRSRCS) $(MISC) | fmt
> -1|sort -u`
>         $(Q)$(MAKE) tags
>
> srcs: $(SRCS) $(HDRS) FORCE
>         $(Q)for sub in $(SUBDIRS); do $(BK) -r$$sub co -q; done
>
> tags: $(patsubst %,%/tags.local, $(SUBDIRS)) tags.local
>         @if [ -x $(BK) ]; \
>         then    $(BK) get -Sq tags.skippats; \
>                 $(BK) _sort -u $^ | grep -v -ftags.skippats > $@; \
>         else \
>                 bk get -Sq tags.skippats; \
>                 bk _sort -u $^ | grep -v -ftags.skippats > $@; \
>         fi
>         @echo ctags completed
>
> tags.local: $(SRCS) $(HDRS)
>         @ctags -f $@ --file-tags=yes --c-types=d+f+s+t $^
>
> %/tags.local: FORCE
>         $(Q)$(MAKE) -C $(dir $@) tags.local
>
> ssh sshtest:
>         $(MAKE) realtest
>
> rsh rshtest:
>         PREFER_RSH=YES $(MAKE) realtest
>
> test tests:
>         DO_REMOTE=NO $(MAKE) -C t
>
> nonet nonet_test localtest:
>         BK_NONET=YES PREFER_RSH=YES $(MAKE) realtest
>
> realtest: $(ALL) t/doit
>         -cd gui/tcltk && $(MAKE) clobber
>         -$(BK) get -qS t/setup t/win32/win32_common
>         $(BK) -rt get -qTS 't.*'
>         cd t && ./doit -f 5
>
> guitest: $(ALL) t/doit
>         -$(BK) get -qS t/SCCS/s.g.* t/setup t/win32/win32_common
> t/guitest.tcl
>         cd t && ./doit -g -i
>
> t/doit: t/doit.sh substvars
>         ./substvars t/doit.sh > t/doit
>         chmod +x t/doit
>
> t/guitest: t/guitest.tcl
>         cat < t/guitest.tcl > t/guitest
>
> .PHONY: FORCE
> FORCE:
>
> win32: FORCE
>         cd win32 && $(MAKE) BINDIR=$(BINDIR)
>         cd t/win32 && $(MAKE)
>
> # build libraries in sub directories
> %.a: FORCE
>         $(Q)$(MAKE) -C $(dir $@) $(notdir $@)
>
> libc/mtst$(EXE): libc/libc.a FORCE
>         $(Q)$(MAKE) -C libc mtst$(EXE)
>
> bkres.o: win32/data/bk.rc bk.ico
>         windres -i win32/data/bk.rc -o bkres.o
>
> bk.ico: win32/data/bk.ico
>         @cp -f win32/data/bk.ico .
>
> ifneq ($(TOMCRYPT_SYSTEM),1)
> # add dependency on building libraries first
> $(BK): $(TOMCRYPT_LDFLAGS)
> endif
> ifneq ($(TOMMATH_SYSTEM),1)
> # add dependency on building libraries first
> $(BK): $(TOMMATH_LDFLAGS)
> endif
>
> $(BK): $(LIBS) bk.o $(RESOURCE) $(OBJ)
>         $(if $(Q),@echo LINKING $(BK),)
>         $(Q)$(LD) $(LDFLAGS) -o $@ bk.o $(OBJ) $(RESOURCE) $(LIBS) \
>                 $(TOMCRYPT_LDFLAGS) $(TOMMATH_LDFLAGS) \
>                 $(PCRE_LDFLAGS) $(LZ4_LDFLAGS) $(ZLIB_LDFLAGS) $(XLIBS)
>
> # Windows only rule, BKGUI should be blank on other platforms
> $(BKGUI): bkg.o $(RESOURCE)
>         $(if $(Q),@echo LINKING $(BKGUI),)
>         $(Q)$(LD) $(LDFLAGS) -o $@ bkg.o $(RESOURCE) -Llibc -lc -mwindows
> $(XLIBS)
>
> bk.script: bk.sh port/$(SYS)_platform.sh
>         cat port/$(SYS)_platform.sh bk.sh > bk.script
>         chmod +x bk.script
>
> bkmsg.txt: bkmsg.doc
>         cp -f $< $@
>
> L-clean: FORCE
>         @rm -f gui/share/doc/L/little.man ../man/man1/bk-little.1
>         @rm -f ../man/man2help/bk-little-1.fmt
>
> # has to run before bkhelp.txt but after GUI
> L-doc L-docs: GUI FORCE
>         @test -f gui/share/doc/L/little.man || { \
>                 echo Failed to build gui/share/doc/L/little.man; \
>                 exit 1; \
>         }
>         @if [ -s gui/share/doc/L/little.man ]; \
>         then    cp gui/share/doc/L/little.man ../man/man1/bk-little.1; \
>         else    cp ../man/man1/bk-little.1.pfmt ../man/man1/bk-little.1; \
>         fi; \
>         chmod +w ../man/man1/bk-little.1
>
> bkhelp.txt: $(BK) version L-docs FORCE
>         @rm -f ../man/man2help/bk-little.fmt
>         @cd ../man/man2help && $(MAKE) BK=$(HERE)/bk$(EXE) helptxt
>         @cp ../man/man2help/helptxt bkhelp.txt
>         @rm -f ../man/man1/bk-little.1
>
> html-docs: bkhelp.txt
>         @cd ../man/man2html && $(MAKE)
>
> ../doc/bk_refcard.ps: $(BK) FORCE
>         $(Q)echo building $@
>         $(Q)-$(BK) -r../doc co -qS
>         $(Q)$(MAKE) -C ../doc BK=$(HERE)/bk$(EXE) all
>
> ../doc/bk_refcard.pdf: ../doc/bk_refcard.ps
>
> # This must be rebuilt every time because it includes the build time
> bkver.c: utils/bk_version FORCE
>         $(if $(Q),@echo Building $@,)
>         $(Q)echo "#include \"sccs.h\"" > bk.v
>         $(Q)echo "char *bk_platform = \""`./utils/bk_version`"\";" >> bk.v
>         $(Q)echo "int test_release = "$(TRIAL)";" >> bk.v
>         $(Q)echo "time_t bk_build_timet = "`perl -e "print time"`";" >>
> bk.v
>         $(Q)echo "char *bk_build_dir = \""`pwd`"\";" >> bk.v
>         $(Q)mv -f bk.v bkver.c
>
> version: version.sh $(BK) utils/bk_version GUI FORCE
>         bash version.sh > $@
>
> %: %.sh
>         $(if $(Q),@echo Building $@,)
>         $(Q)$(RM) $@
>         $(Q)cp $< $@
>         $(Q)chmod +x $@
>
> %: %.l
>         $(if $(Q),@echo Not lexing $@,)
>
> import: import.sh port/$(SYS)_platform.sh
>         cat port/$(SYS)_platform.sh import.sh > import.T
>         chmod +x import.T
>         mv -f import.T import
>
> # Quick and dirty target so we can make all the gui tools without the rest
> .PHONY: GUI
> GUI: PCRE $(BK)
>         @$(MAKE) -Cgui BK=$(HERE)/bk$(EXE) gui
>
> install: installdir
>         tmp/bitkeeper/bk _install -d -f $(DESTDIR)$(BINDIR)
>         @echo BitKeeper is installed in $(BINDIR)
>         @echo We suggest you run:
>         @echo
>         @echo sudo $(BINDIR)/bk links /usr/local/bin
>         @echo
>         @echo to create the bk symlink.
>
> installdir: utils/registry.tcl
>         rm -rf $(IMGDIR) || exit 1
>         mkdir -p $(IMGDIR)/contrib
>         mkdir -p $(IMGDIR)/lscripts
>         -$(BK) -rwww get -S
>         -cp -f -r www $(IMGDIR)
>         -$(BK) get -S $(CONTRIB)
>         tar cf - $(BINS) $(SCRIPTS) lscripts gui/bin gui/lib gui/images \
>                 | (cd $(IMGDIR) && tar xf -)
>         cp -f $(DATA) $(IMGDIR)
>         cp -f $(CONTRIB) $(IMGDIR)/contrib
>         (cd ../doc/nested && $(MAKE) install HTML=$(IMGDIR)/html)
>         if [ $(SYS) = unix ]; \
>         then    $(BK) get -S ../man/Makefile; \
>                 cd ../man && $(MAKE) install BINDIR=$(IMGDIR) ;\
>         else \
>                 (cd win32 && $(MAKE) BINDIR=$(IMGDIR) install); \
>                 cp utils/registry.tcl $(IMGDIR)/gui/lib; \
>         fi
>         cd $(IMGDIR); \
>             find . -type l | \
>                 perl -ne 'chomp; $$a = readlink; print
> "$$a|$$_\n";'>symlinks; \
>             test -s symlinks || rm -f symlinks
>         @true
>
> image:  ## Build the installer (left in src/utils/bk-*)
>         $(MAKE) p
>         $(MAKE) _image
>
> _image:
>         $(MAKE) installdir
>         ${MAKE} -Cutils BINDIR=$(IMGDIR) "CC=$(CC)" "BK=$(HERE)/bk$(EXE)"
> "CFLAGS=$(CFLAGS)" image
>
> crankturn: crank.sh remote.sh  ## Run a clean-build + regressions in
> cluster
>         REPO=$(REPO) URL=$(URL) REMOTE=remote.sh LOG=$(LOG) bash crank.sh
>
> cranksave: crank.sh remote.sh  ## Run a crankturn but save the built images
>         REPO=$(REPO) URL=$(URL) REMOTE=remote.sh LOG=$(LOG) bash crank.sh
> save
>
> crankstatus: crank.sh remote.sh  ## See how the crank is going
>         REPO=$(REPO) URL=$(URL) REMOTE=remote.sh LOG=$(LOG) bash crank.sh
> status
>
> crankrelease nightly: $(BK) crank.sh remote.sh  ## Do a BitKeeper release
> (or nightly build)
>         @(TAG=$(shell $(BK) changes -r+ -d:TAG:) ; \
>         test x$$TAG = x && { \
>                 echo Cannot crankrelease with a non-tagged tip ; \
>                 exit 1 ; \
>         } ; \
>         case $@ in \
>         crankrelease ) \
>                 TYPE=release; DIR=/home/bk/images/$$TAG; \
>                 ;; \
>         nightly ) \
>                 TYPE=nightly; DIR=/home/bk/images/nightly; \
>                 HOSTS="$(NIGHTLY_HOSTS)" ; \
>                 ;; \
>         esac ; \
>         test -d $$DIR || mkdir -p $$DIR ; \
>         REPO=$(REPO) URL=$(URL) HOSTS=$$HOSTS REMOTE=remote.sh \
>             LOG=$(LOG) bash crank.sh $$TYPE ; \
>         $(BK) -R get -qS ../RELEASE-NOTES.md ; \
>         cp ../RELEASE-NOTES.md $$DIR ; \
>         SAVED_WD=$(shell pwd) ; \
>         cd $$DIR && chmod +rx bk-* >/dev/null 2>&1 ; \
>         rm -f MD5SUMS ; \
>         md5sum bk-* >> MD5SUMS ; \
>         echo "Your images are in $$DIR" ; \
>         case $@  in  \
>         crankrelease ) \
>                 echo "Run './mkrelease $$TAG' to release this version of
> bk."; \
>                 ;; \
>         nightly ) \
> #               cd $$SAVED_WD ; \
> #               ./mkupgrades --nightly $$TAG ; \
>                 ;; \
>         esac)
>
> crankclean: crank.sh remote.sh
>         REPO=$(REPO) URL=$(URL) REMOTE=remote.sh LOG=$(LOG) bash crank.sh
> clean
>
> # This target assumes a bk repository
> .PHONY: src-tar
> src-tar: $(BK) version ## build tar.gz image for the current tree
> ifeq (false,$(INREPO))
>         $(error This target only works in a BK source repository)
> else
>         ./bk here add default TCLTK
>         $(Q)-mkdir -p tmp/src
>         $(Q)(DIR=bk-$(shell $(BK) version -s) ; \
>              TAR="$$DIR".tar.gz ; \
>              echo "Creating $$TAR in tmp/src..." ; \
>              cd tmp/src ; \
>              rm -rf "$$DIR" ; \
>              ../../bk export -tplain -kwr+ -sdefault -sTCLTK "$$DIR" ; \
>              cat ../../version > "$$DIR/src/bkvers.txt" ; \
>              tar -czf "$$TAR" "$$DIR" ; \
>              rm -rf "$$DIR" ; \
>              echo Done ; \
>         )
> endif
>
> # only depend on conf.mk.local if it exists
> conf.mk: mkconf.sh $(wildcard conf.mk.local)
>         sh mkconf.sh > $@ || { $(RM) $@; false; }
>
> %.o: %.c
>         $(if $(Q),@echo CC $<,)
>         $(Q)$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
>
> port/startmenu.o: port/startmenu.c $(HDRS)
>         $(if $(Q),@echo CC $<,)
>         $(Q)$(CC) $(CFLAGS) -fno-strict-aliasing $(CPPFLAGS) -c $< -o $@
>
> depend: $(SRCS)
>         $(CC) -MM -MG -D_DEPEND $(SRCS) > depends
>
> # for system.h we need to actually run libc's makefile because it includes
> # calculated header files
> libc/system.h: FORCE
>         $(MAKE) -C libc system.h
>
> libc/libc.a: libc/system.h
>
> sccs.h: PCRE
> .PHONY: PCRE
> PCRE:
> ifneq ($(PCRE_SYSTEM),1)
>         $(MAKE) -Cgui/tcltk pcre
> endif
>
> $(OBJ) bk.o: $(HDRS)
>
> cmd.c cmd.h: cmd.pl bk.sh $(filter bkd_%,$(SRCS))
>         $(if $(Q),@echo Building $@,)
>         $(Q)perl cmd.pl || (rm -f cmd.c cmd.h; exit 1)
>
> # This parses slib.c and extracts the meta-data keywords expanded
> # by kw2val() and passes them to gperf to generate hash lookup code.
> slib.o: kw2val_lookup.c
> kw2val_lookup.c: slib.c kw2val.pl
>         $(if $(Q),@echo Building $@,)
>         $(Q)perl kw2val.pl slib.c || (rm -f kw2val_lookup.c; exit 1)
>
> check-syntax:
>         $(CC) $(CFLAGS) $(CPPFLAGS) -c -S ${CHK_SOURCES} -o /dev/null
>
> # print a make variable  'make print-REPO'
> #   http://www.cmcrossroads.com/article/printing-value-makefile-variable
> print-%:
>         @echo $* = \"$($*)\"
>
> .PHONY: help
>
> help:
>         @grep -E -h '^[-a-zA-Z_\ ]+:.*?## .*$$' $(MAKEFILE_LIST) | sort |
> awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
>         @echo Suggested: make -j12 image
>
>

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