Makefile

   1 # Implicit rules are implemented in make as suffix rules. The following rule
   2 # empties the suffix list to disable the predefined implicit rules. This
   3 # increases performance and avoids hard-to-debug behaviour.
   4 .SUFFIXES:
   5 MAKEFLAGS += -Rr
   6 ifeq ("$(origin CC)", "default")
   7         CC := cc
   8 endif
   9 .ONESHELL:
  10 .SHELLFLAGS := -ec
  11
  12 # Recipes which redirect stdout to the target of the rule (i.e., constructs
  13 # like cmd > $@) create empty or incomplete output files if the command fails,
  14 # for example when cmd was not found. Since the target exists and is uptodate
  15 # in this case, this may lead to all sorts of problems. The following target
  16 # makes sure that such files are removed.
  17 .DELETE_ON_ERROR:
  18
  19 PREFIX ?= /usr/local
  20 M4 := m4
  21 LN := ln -f
  22 LEX := lex
  23 RM := rm -f
  24 AR := ar
  25 GROFF := groff
  26 CP := cp
  27 INSTALL := install
  28 GZIP := gzip -fn9
  29 ZCAT := zcat
  30
  31 dummy != $(M4) /dev/null || printf 'failed'
  32 ifeq ($(dummy), failed)
  33 $(error m4 is required to build this package)
  34 endif
  35 dummy != printf '%%%%\n' | $(LEX) -o /dev/null || printf 'failed'
  36 ifeq ($(dummy), failed)
  37 $(error (f)lex is required to build this package)
  38 endif
  39
  40 DATE_FMT := +%B %Y
  41 # To get a reproducible build, we use $(SOURCE_DATE_EPOCH) instead of the
  42 # current time if this variable is set.
  43 ifdef SOURCE_DATE_EPOCH
  44         DATE := $(shell LC_ALL=C date -u -d '@$(SOURCE_DATE_EPOCH)' \
  45                 '$(DATE_FMT)' 2>/dev/null || LC_ALL=C date -u '$(DATE_FMT)')
  46 else
  47         DATE := $(shell date '$(DATE_FMT)')
  48 endif
  49 GIT_VERSION := $(shell ./version-gen.sh)
  50 PLAIN_VERSION := $(firstword $(subst -, , $(GIT_VERSION)))
  51 MAJOR_VERSION := $(firstword $(subst ., , $(PLAIN_VERSION)))
  52 SONAME := liblopsub.so.$(MAJOR_VERSION)
  53 REALNAME := liblopsub.so.$(PLAIN_VERSION)
  54 LINKERNAME:=liblopsub.so
  55
  56 m4_man_pages := lopsub-suite.5.gz lopsub.7.gz
  57 all := $(m4_man_pages) $(REALNAME) lopsubgen lopsubgen.1.gz \
  58         lopsubex lopsubex.1.gz
  59 all: $(all)
  60
  61 # deps
  62 lopsubgen.o: lsg.h
  63 lopsub.o lsg.o: lopsub.h lopsub-internal.h
  64 lsg.o: lopsubgen.lsg.h lopsub-internal.h
  65 lopsubex.o: lopsubex.lsg.h lopsub.h
  66 config_file.c: lopsub-internal.h lopsub.h
  67 version.o: version.c
  68
  69 # m4 stuff
  70 gendoc := gendoc/gendoc.m4
  71 %.h: %.h.m4 $(gendoc)
  72         $(M4) -DOUTPUT_MODE=C $(gendoc) $< > $@
  73 $(m4_man_pages): %.gz: %.m4 version.c
  74         $(M4) -DGIT_VERSION=$(GIT_VERSION) -DDATE="$(DATE)" $< | $(GZIP) > $@
  75
  76 # flex
  77 %.c: %.l
  78         $(LEX) -o $@ $<
  79
  80 # lopsubgen
  81 lopsubgen.lsg.c lopsubgen.lsg.h: lopsubgen.suite lopsubgen-stage1 \
  82                 lopsub-internal.h
  83         ./lopsubgen-stage1 < $<
  84 %.lsg.c: %.suite lopsubgen
  85         ./lopsubgen --gen-c < $<
  86 %.lsg.h: %.suite lopsubgen
  87         ./lopsubgen --gen-header < $<
  88 %.1.gz: %.suite lopsubgen
  89         ./lopsubgen --gen-man=${@:.gz=} --version-string $(GIT_VERSION) < $<
  90         $(GZIP) ${@:.gz=}
  91
  92 # compiling
  93 lsg1_objs := lopsubgen.o lsg1.o version.o
  94 lsg_objs := lopsubgen.o lsg.o lopsubgen.lsg.o lopsub.o version.o
  95 liblopsub_objs := config_file.o lopsub.o version.o
  96 lopsubex_objs := lopsubex.o lopsubex.lsg.o $(liblopsub_objs)
  97
  98 LLS_CFLAGS := -g -fPIC
  99 STRICT_CFLAGS := -Wall
 100 STRICT_CFLAGS += -Werror-implicit-function-declaration
 101
 102 $(lsg_objs) $(liblopsub_objs) $(lopsubex_objs): %.o: %.c
 103 lopsubgen.o config_file.o:
 104         $(CC) $(CPPFLAGS) $(LLS_CFLAGS) $(CFLAGS) -c -o $@ ${@:.o=.c}
 105 lsg1.o: lsg.c lsg.h
 106         $(CC) $(CPPFLAGS) $(LLS_CFLAGS) $(STRICT_CFLAGS) $(CFLAGS) -DSTAGE1 -c -o $@ $<
 107 %.o: %.c
 108         $(CC) -I. $(CPPFLAGS) $(LLS_CFLAGS) $(STRICT_CFLAGS) $(CFLAGS) -c -o $@ $<
 109
 110 # linking
 111 lopsubgen-stage1: $(lsg1_objs)
 112         $(CC) -Wall -g $(lsg1_objs) -o $@
 113 lopsubgen: $(lsg_objs)
 114         $(CC) -Wall -g -o $@ $(lsg_objs)
 115 $(REALNAME): $(liblopsub_objs)
 116         $(CC) --shared -Wl,-soname,liblopsub.so.$(MAJOR_VERSION) -o $@ $^
 117 lopsubex: $(lopsubex_objs) $(REALNAME)
 118         $(CC) -Wall -g -o $@ $(lopsubex_objs)
 119
 120 # web
 121 html := $(addprefix web/, $(addsuffix .html, \
 122         index lopsub-api lopsubgen.1 lopsubex.1 $(m4_man_pages:.gz=)))
 123 www: $(html)
 124 web/lopsub-api.html: lopsub.h.m4 web/header.html web/footer.html
 125         $(M4) -DOUTPUT_MODE=HTML web/header.html $(gendoc) \
 126                 $< web/footer.html > $@
 127 web/index.html: web/lopsub.7.html
 128         $(LN) -s $(notdir $<) $@
 129 web/%.html: %.gz web/header.html
 130         $(CP) web/header.html $@
 131         $(ZCAT) $< | $(GROFF) -m man -Thtml | sed -e '1,/^<body>/d' >> $@
 132
 133 install: $(all)
 134         $(INSTALL) -d $(DESTDIR)$(PREFIX)/lib $(DESTDIR)$(PREFIX)/include \
 135                 $(DESTDIR)$(PREFIX)/share/man/man1 $(DESTDIR)$(PREFIX)/share/man/man5 \
 136                 $(DESTDIR)$(PREFIX)/share/man/man7 $(DESTDIR)$(PREFIX)/bin
 137         $(INSTALL) -m 644 $(REALNAME) $(DESTDIR)$(PREFIX)/lib
 138         $(LN) -s $(REALNAME) $(DESTDIR)$(PREFIX)/lib/$(SONAME)
 139         $(LN) -s $(SONAME) $(DESTDIR)$(PREFIX)/lib/$(LINKERNAME)
 140         $(INSTALL) -m 755 lopsubgen $(DESTDIR)$(PREFIX)/bin
 141         $(INSTALL) -m 644 lopsub.h $(DESTDIR)$(PREFIX)/include
 142         $(INSTALL) -m 644 lopsub-internal.h $(DESTDIR)$(PREFIX)/include
 143         $(INSTALL) -m 644 lopsubgen.1.gz $(DESTDIR)$(PREFIX)/share/man/man1
 144         $(INSTALL) -m 644 lopsub-suite.5.gz $(DESTDIR)$(PREFIX)/share/man/man5
 145         $(INSTALL) -m 644 lopsub.7.gz $(DESTDIR)$(PREFIX)/share/man/man7
 146
 147 clean:
 148         $(RM) $(all) $(html) *.o *.man
 149 distclean: clean
 150         $(RM) *.lsg.c *.lsg.h lopsubgen.c config_file.c lopsubgen-stage1 \
 151                 lopsub.h lopsub.7 lopsub-suite.5 version.c
 152