# where to install
prefix := /usr/local
libdir := $(prefix)/lib
includedir := $(prefix)/include
bindir := $(prefix)/bin
mandir := $(prefix)/man/man1

objects := osl.o util.o rbtree.o sha1.o
fsck_objects := fsck.fsck.o osl.fsck.o util.fsck.o rbtree.fsck.o sha1.fsck.o fsck.cmdline.o
headers := osl.h
executables := oslfsck
man_pages := oslfsck.1

INSTALL := install
CC := gcc
MKDIR := mkdir -p
RM := rm -f
LN := ln

# libosl's versioning consists of three numbers. Let's call them x, y and z.
# The way x, y and z are interpreted depends on the OS.
x := 0
y := 1
z := 0
VERSION := $(x).$(y).$(z)

# common flags
CFLAGS += -Wno-sign-compare -g -Wunused -Wundef -W
CFLAGS += -Wredundant-decls
CFLAGS += -Os
CFLAGS += -Wall
CFLAGS += -Wuninitialized
CFLAGS += -Wchar-subscripts
CFLAGS += -Wformat-security
CFLAGS += -Werror-implicit-function-declaration
CFLAGS += -Wmissing-format-attribute
CFLAGS += -Wunused-macros
CFLAGS += -Wbad-function-cast

# cflags used only for building library objects
LIBCFLAGS += -fPIC
LIBCFLAGS += -fvisibility=hidden

uname_s := $(shell uname -s 2>/dev/null || echo "UNKNOWN_OS")
uname_rs := $(shell uname -rs)

libname := osl

ifeq ($(uname_s),Linux)
	format := elf
	LDFLAGS += -Wl,-soname,$(soname)
	# disallow undefined symbols
	LDFLAGS += -Wl,-z,defs
endif
ifeq ($(uname_s),Darwin)
	# Darwin has its own idea on version numbers:
	realname := lib$(libname).$(x).dylib
	soname := $(realname)
	linkername := lib$(libname).so
	# The minor version number is an incremental number using the format
	# X[.Y[.Z]]. To set the minor version number of a dynamic library, use
	# the gcc -current_version option.
	LDFLAGS += -current_version $(y).$(z)
	#
	# The compatibility version number of a library release specifies the
	# earliest minor version of the clients linked against that release can
	# use.
	LDFLAGS += -compatibility_version $(y).0
	LDFLAGS += -dynamiclib
endif
ifeq ($(uname_s),SunOS)
	format := elf
	# Solaris needs another set of flags
	LDFLAGS += -z text
	LDFLAGS += -z defs
	CPPFLAGS += -I/opt/csw/include
	LDFLAGS += -lc
endif

ifeq ($(uname_s),NetBSD)
	format := elf
	LDFLAGS += -Wl,-soname,$(soname)
endif

ifeq ($(uname_s),FreeBSD)
	format := elf
	LDFLAGS += -Wl,-soname,$(soname)
endif

ifeq ($(format),elf)
	# On ELf-based systems, the following conventions apply (see dhweeler's
	# Program Library HOWTO):
	#
	# The soname has the prefix ``lib'', the name of the library, the
	# phrase ``.so'', followed by a period and a version number that is
	# incremented whenever the interface changes.
	soname := lib$(libname).so.$(x)

	# The real name adds to the soname a period, a minor number, another
	# period, and the release number.
	realname := $(soname).$(y).$(z)

	# In addition, there's the name that the compiler uses when requesting
	# a library, (I'll call it the ``linker name''), which is simply the
	# soname without any version number.
	linkername := lib$(libname).so
	LDFLAGS += --shared
endif


all: $(realname) $(executables) $(man_pages)
Makefile.deps: $(wildcard *.c *.h)
	$(CC) -MM -MG *.c > $@
osl.c fsck.c:

-include Makefile.deps

fsck.cmdline.o: fsck.cmdline.c fsck.cmdline.h
	$(CC) -c -DVERSION='"$(VERSION)"' $<

%.fsck.o: %.c Makefile fsck.cmdline.c fsck.cmdline.h osl.h errtab.h
	$(CC) -c -DVERSION='"$(VERSION)"' $(CPPFLAGS) $(CFLAGS) $< -o $@

%.o: %.c Makefile errtab.h
	$(CC) -c $(CPPFLAGS) $(CFLAGS) $(LIBCFLAGS) $<

fsck.cmdline.h fsck.cmdline.c: fsck.ggo Makefile
	gengetopt $$O \
		--conf-parser \
		--unamed-opts=table \
		--no-handle-version \
		--file-name=fsck.cmdline \
		--func-name=fsck_cmdline_parser \
		--set-package="oslfsck" \
		--arg-struct-name=fsck_args_info \
		< $<

oslfsck: $(fsck_objects)
	$(CC) -o $@ $(fsck_objects) -lcrypto

oslfsck.1: oslfsck
	help2man -h --detailed-help -N ./$< > $@


$(realname): $(objects)
	$(CC) $(LDFLAGS) -o $@ $(objects) -lcrypto

osl_errors.h: errlist
	sed -e 's/\([A-Z_]*\)	.*/	E_OSL_\1/' \
		-e '1s/^/enum osl_errors {/1' \
		-e '1s/$$/=1/1' \
		-e '$$!s/$$/,/g' \
		-e '$$s/$$/};/1' $< > $@

errtab.h: errlist
	sed -e 's/^\([A-Z_]*\)\s*\(.*\)/OSL_ERROR(E_OSL_\1, \2)/g' $< > $@

osl.h: osl.h.in osl_errors.h Makefile
	echo '#ifndef _OSL_H' > $@
	echo '#define _OSL_H' >> $@
	cat osl.h.in osl_errors.h >> $@
	echo '#endif /* _OSL_H */' >> $@
clean:
	rm -f *.o $(realname) osl.h osl_errors.h errtab.h fsck.cmdline.h \
		fsck.cmdline.c oslfsck

install: all
	$(MKDIR) $(libdir) $(includedir)
	$(RM) $(libdir)/$(linkername)
	$(LN) -s $(libdir)/$(soname) $(libdir)/$(linkername)
	$(INSTALL) -s -m 755 $(realname) $(libdir)
	$(INSTALL) -m 644 $(headers) $(includedir)
	$(INSTALL) -m 644 $(executables) $(bindir)
	$(INSTALL) -m 644 $(man_pages) $(mandir)

.PHONY: all clean install