CC?=gcc
STRIP?=strip
DEBUG_CFLAGS=-Og -march=native -fno-omit-frame-pointer -pipe -g3
CLANG_DEBUG_CFLAGS=-O0 -march=native -fno-omit-frame-pointer -pipe -g3
OPT_CFLAGS=-O2 -march=native -fomit-frame-pointer -frename-registers -fweb -pipe
CLANG_OPT_CFLAGS=-O2 -march=native -fomit-frame-pointer -pipe
K3_CFLAGS=-O2 -ffast-math -march=armv6j -mtune=arm1136jf-s -fomit-frame-pointer -frename-registers -fweb -pipe -fno-stack-protector -U_FORTIFY_SOURCE
MINGW_CFLAGS=-O2 -march=i686 -mtune=generic -fomit-frame-pointer -pipe
# When we want to use clang's asan (http://clang.llvm.org/docs/AddressSanitizer.html), because it rocks.
ASAN_CLFAGS=-O1 -march=native -fno-omit-frame-pointer -pipe -fno-optimize-sibling-calls -Weverything -Wno-disabled-macro-expansion -fsanitize=address -g3
# In the same vein, since valgrind 2.8.0 now runs properly on my Gentoo system, here's a few notes about its current report:
# (Using --leak-check=full --track-origins=yes --show-reachable=yes)
# The getpwuid_r/getgrgid_r thing from libarchive's archive_read_disk_set_standard_lookup is mostly harmless (cf. http://sourceware.org/bugzilla/show_bug.cgi?id=2314),
# and only happens when using the NSS compat stuff (which happened to be the default on my system...)

# Kindle cross toolchain prefix
ifeq "$(KINDLE)" "true"
	CROSS_PREFIX?=arm-kindle-linux-gnueabi-
endif
# MinGW cross toolchain prefix
ifeq "$(MINGW)" "true"
	CROSS_PREFIX?=i686-w64-mingw32-
endif

SRCS=kindle_tool.c create.c convert.c nettle_pem.c

default: all

# OS, version, pkgconfig & misc stuff handling (heavily inspired from git's Makefiles ;))
# It's basically our fake automated configure script, and it uses bash features, so override the default shell!
SHELL:=/bin/bash
version-inc:
	@$(SHELL) ./version.sh
-include version-inc

# Try to use sane defaults for DESTDIR/PREFIX, while still playing nice with PMS
ifndef DESTDIR
	PREFIX:=/.
else
	ifeq "$(OSTYPE)" "Darwin"
		# Play nice with Homebrew (not so much, in fact, but whatever).
		PREFIX?=/usr/local
	else
		# Should play nice with various Linux PMS, specifically non-prefixed Portage/Paludis setups
		PREFIX:=/usr
	endif
endif
DESTDIR?=/usr/local
BINDIR:=$(DESTDIR)/$(PREFIX)/bin
MANDIR:=$(DESTDIR)/$(PREFIX)/share/man/man1

ifeq "$(OSTYPE)" "Darwin"
	# Homebrew default paths... (w/ libarchive keg)
	CPPFLAGS?=-I/usr/local/include -I/usr/local/opt/libarchive/include
else
	CPPFLAGS?=-Iincludes
endif

# We of course need libarchive
LIBS=-larchive
# And nettle (try to use sane fallbacks on the off chance we have it somewhere but pkg-config failed to find it...)
ifeq "$(HAS_PC_NETTLE)" "true"
	LIBS+=$(PC_NETTLE_LIBS)
else
	LIBS+=-lhogweed -lgmp -lnettle
endif
# And zlib (for libarchive)
LIBS+=-lz

# If we want to use part of gperftools (http://gperftools.googlecode.com/svn/trunk/doc/heap_checker.html for example)
#ifeq "$(OSTYPE)" "Linux"
#	LIBS+=-ltcmalloc
#endif

ifeq "$(DEBUG)" "true"
	OUT_DIR=Debug
	# Clang doesn't support -Og...
	ifeq "$(OSTYPE)" "Darwin"
		CFLAGS:=$(CLANG_DEBUG_CFLAGS)
	else
		ifeq "$(CC)" "clang"
			CFLAGS:=$(CLANG_DEBUG_CFLAGS)
		else ifeq "$(lastword $(subst /, ,$(CC)))" "ccc-analyzer"
			CFLAGS:=$(CLANG_DEBUG_CFLAGS)
		else
			CFLAGS:=$(DEBUG_CFLAGS)
		endif
	endif
else
	OUT_DIR=Release
	# Don't default to stuff that'll make clang unhappy on OS X
	ifeq "$(OSTYPE)" "Darwin"
		CFLAGS?=$(CLANG_OPT_CFLAGS)
	else
		ifeq "$(CC)" "clang"
			CFLAGS?=$(CLANG_OPT_CFLAGS)
		else ifeq "$(lastword $(subst /, ,$(CC)))" "ccc-analyzer"
			CFLAGS?=$(CLANG_OPT_CFLAGS)
		else
			CFLAGS?=$(OPT_CFLAGS)
		endif
	endif
endif

ifeq "$(KINDLE)" "true"
	OUT_DIR=Kindle
	CFLAGS?=$(K3_CFLAGS)
	CC:=$(CROSS_PREFIX)gcc
	STRIP:=$(CROSS_PREFIX)strip
endif

ifeq "$(MINGW)" "true"
	OUT_DIR=MinGW
	CFLAGS?=$(MINGW_CFLAGS)
	CC:=$(CROSS_PREFIX)gcc
	STRIP:=$(CROSS_PREFIX)strip
endif

# Oh, OS X...
ifeq "$(OSTYPE)" "Darwin"
	STRIP_OPTS:=
else
	STRIP_OPTS:=--strip-unneeded
endif

# It appears that Windows is using a strange & incongruous file extension for its binaries... ;D
ifeq "$(MINGW)" "true"
	# Cygwin is smart enough to take care of it itself, so just check MinGW ;)
	BINEXT:=.exe
else
	BINEXT:=
endif

# NOTE: All the KT_ prefixed *FLAGS are stuff that we *always* want set, no matter what the user does.
# Moar warnings!
KT_CFLAGS+=-Wall -Wformat -Wformat-security
KT_CFLAGS+=-Wextra -Wunused
KT_CFLAGS+=-Wshadow
KT_CFLAGS+=-Wmissing-prototypes
KT_CFLAGS+=-Wcast-qual
KT_CFLAGS+=-Wcast-align
KT_CFLAGS+=-Wconversion
# libarchive is always built with large files support, do the same to avoid issues.
KT_CPPFLAGS+=-D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
# Get a printf function family with GNU extensions support on MinGW...
ifeq "$(MINGW)" "true"
	# That's enough for MinGW
	KT_CPPFLAGS+=-D_GNU_SOURCE
	# But not for MinGW-w64...
	KT_CPPFLAGS+=-D__USE_MINGW_ANSI_STDIO=1
endif
KT_CPPFLAGS+=-DKT_VERSION='"$(KT_VERSION)"'
# Add a user@host build tag, unless explicitly forbidden
ifndef KT_NO_USERATHOST_TAG
	KT_CPPFLAGS+=-DKT_USERATHOST='"$(COMPILE_BY)@$(COMPILE_HOST) on $(DISTRIB_ID)"'
endif
# Also pass our stupid hack to get the buildtime nettle version, if it's not empty...
ifneq "$(PC_NETTLE_VERSION)" ""
	KT_CPPFLAGS+=-DNETTLE_VERSION='"$(PC_NETTLE_VERSION)"'
endif

ifndef LDFLAGS
	ifeq "$(OSTYPE)" "Darwin"
		# Again, Homebrew default paths, w/ libarchive keg
		LDFLAGS:=-L/usr/local/lib -L/usr/local/opt/libarchive/lib
	else
		LDFLAGS:=-Llib
		LDFLAGS+=-Wl,-O1 -Wl,--as-needed
	endif
endif

# On platforms where we rely on pkg-config (Linux & OS X), make sure we obey it!
# That should help us link against the correct libarchive version on Debian/Ubuntu, where libarchive-2 and libarchive-3 coexist with a single -dev package;
# And on OS X, where libarchive is keg-only with Homebrew.
ifeq "$(HAS_PC_LIBARCHIVE)" "true"
	CPPFLAGS+=$(PC_LIBARCHIVE_CPPFLAGS)
	LDFLAGS+=$(PC_LIBARCHIVE_LDFLAGS)
endif
# Do the same for nettle
ifeq "$(HAS_PC_NETTLE)" "true"
	CPPFLAGS+=$(PC_NETTLE_CPPFLAGS)
	LDFLAGS+=$(PC_NETTLE_LDFLAGS)
endif

# Let's say we want to default to building stuff that will work on OS X 10.6/10.7... If I get how this stuff works, that should do it...
#ifeq "$(OSTYPE)" "Darwin"
#	# Check that we don't mess with Homebrew, which defaults to the OS version... (I'm not sure Homebrew even sets it for us, since we're not using autotools...)
#	# Although it supposedly defaults to the OS version since OS X 10.5 anyway, so...
#	ifndef MACOSX_DEPLOYMENT_TARGET
#		export MACOSX_DEPLOYMENT_TARGET=10.6
#		KT_CFLAGS+=-mmacosx-version-min=10.6
#	endif
#endif

OBJS:=$(SRCS:%.c=$(OUT_DIR)/%.o)

$(OUT_DIR)/%.o: %.c
	$(CC) $(CPPFLAGS) $(KT_CPPFLAGS) $(CFLAGS) $(KT_CFLAGS) -o $@ -c $<

outdir:
	mkdir -p $(OUT_DIR)

all: outdir kindletool

kindletool: version-inc $(OBJS)
	$(CC) $(CPPFLAGS) $(KT_CPPFLAGS) $(CFLAGS) $(KT_CFLAGS) $(LDFLAGS) -o$(OUT_DIR)/$@$(BINEXT) $(OBJS) $(LIBS)

strip: all
	$(STRIP) $(STRIP_OPTS) $(OUT_DIR)/kindletool$(BINEXT)

debug:
	$(MAKE) all DEBUG=true

kindle:
	$(MAKE) strip KINDLE=true

mingw:
	$(MAKE) strip MINGW=true

clean:
	rm -rf Release/*.o
	rm -rf Release/kindletool
	rm -rf Debug/*.o
	rm -rf Debug/kindletool
	rm -rf Kindle/*.o
	rm -rf Kindle/kindletool
	rm -rf MinGW/*.o
	rm -rf MinGW/kindletool.exe
	rm -rf version-inc
	rm -rf VERSION

install: all
	install -d -m 755 $(BINDIR)
	install '$(OUT_DIR)/kindletool' $(BINDIR)
	install -d -m 755 $(MANDIR)
	install -m 644 kindletool.1 $(MANDIR)


.PHONY: all install clean default outdir kindletool strip debug kindle mingw