##
# Variables included by all Makefiles.
##

## Directory definitions

libdir       = $(slateroot)/lib
mobiusdir    = $(slateroot)/src/mobius
platformdir  = $(mobiusdir)/vm/platform
pluginsdir   = $(slateroot)/src/plugins
testdir      = $(slateroot)/tests
benchmarkdir = $(testdir)/benchmark

prefix      = /usr/local
datadir     = $(prefix)/share/slate
exec_prefix = $(prefix)/bin
execname    = slate
includedir  = $(prefix)/include
mandir      = $(prefix)/man
man1dir     = $(mandir)/man1
infodir     = $(prefix)/info
lispdir     = $(prefix)/share/emacs/site-lisp
DEVNULL     := /dev/null

## Build modes. Set on command line using VERBOSE=1, DEBUG=1 or PROFILE=1

ifndef VERBOSE
  VERBOSE := 0
  SILENT := @
  SILENT_ERRORS := 2> $(DEVNULL)
  LIBTOOL_FLAGS += --silent
endif

ifdef DEBUG
  MODE := debug
  COPTFLAGS += -g -Wall
else
  MODE := optimized
  COPTFLAGS += -O2 -Wall -DNDEBUG=1
endif

ifdef PROFILE
  MODE += profiled
  COPTFLAGS += -pg -g
else
  COPTFLAGS += -fomit-frame-pointer 
endif

ifdef DEBUG_MSG
  MODE += debug_msg
  COPTFLAGS += -DDEBUG_MSG=1
endif

## All required executables

CC          := gcc
CP          := cp -f
LIBTOOL     ?= libtool
ECHO        := echo
WGET        := wget -q --cache=off
SECHO       := @$(ECHO)
INSTALL     := install
TAR         := tar
GZIP        := gzip
ETAGS       := etags
EMACS       := emacs

## Platform independent definitions

INCLUDES    += -I${platformdir}/includes -I. -I${slateroot}
CFLAGS      += $(COPTFLAGS) $(INCLUDES) -DSLATE_DATADIR=$(datadir)
CFLAGS      += -DSLATE_IMGNAME=$(BOOTIMG)
CFLAGS      += -DVERSION=$(VERSION)

## Determine the host system's byte order.
## This creates a temporary test executable in the $(slateroot) directory
## since we can guarantee write permissions there on all platforms. 

BYTE_ORDER  := "int main(){union{long l;char c[sizeof(long)];}u;u.l=1;return(u.c[sizeof(long)-1]==1);}"
BYTE_ORDER  := $(shell echo $(BYTE_ORDER) > $(slateroot)/byteorder.c)
BYTE_ORDER  := $(shell $(CC) -o $(slateroot)/byteorder $(slateroot)/byteorder.c)
BYTE_ORDER  := $(shell $(slateroot)/byteorder; echo $$?)
BYTE_ORDER_ := $(shell $(RM) $(slateroot)/byteorder.* $(slateroot)/byteorder 1>&2)
ifeq ($(BYTE_ORDER),0)
  BYTE_ORDER := LITTLE_ENDIAN
  BYTE_ORDER_PREFIX := little
else
  BYTE_ORDER := BIG_ENDIAN
  BYTE_ORDER_PREFIX := big
endif

## Default variables

PLATFORM    := unix
VARIANT     := # .new
VM          := $(slateroot)/vm$(VARIANT)
SDLVM       := $(slateroot)/sdlvm
VERSION     := $(shell [ -f $(slateroot)/VERSION ] && cat $(slateroot)/VERSION)
CCVERSION   := $(shell $(CC) -dumpversion)
BOOTIMG     := slate$(VARIANT).image
ALPHA_URL   := http://slate.tunes.org/repos/alpha
WORD_SIZE   := 32
LDFLAGS     := # -avoid-version
LIBS        := -lm -ldl
ANSI_PLUGINS := platform time
POSIX_PLUGINS := $(ANSI_PLUGINS) socket posix pipe
PLUGINS     := smart-console/ncurses socket platform time posix pipe
UI_PLUGINS  := sdl-windows cairo
ALPHAIMG    := kernel$(VARIANT).$(BYTE_ORDER_PREFIX).$(WORD_SIZE).image
BOOTFILES   := vm$(VARIANT).c vm$(VARIANT).h AutoLoad
HOST_SYSTEM := $(shell uname -s)
LIB_SO_EXT  := .so
INSTALL_MODE := -m 644
TARKITDIR   := slate-$(VERSION)
TARKITFILE  := $(TARKITDIR).tar
DISTFILES   := demo doc etc src tests Makefile common.mk BUGS CREDITS
DISTFILES   += LICENSE NEWS README VERSION $(ALPHAIMG)
CPU_TYPE    := i386

## Print the welcome banner

ifndef BANNER
  BANNER := $(shell echo 1>&2 )
  BANNER := $(shell echo "Welcome to Slate: Less talk, more rock!" 1>&2 )
  BANNER := $(shell echo " Version: $(VERSION)" 1>&2 )
  BANNER := $(shell echo " Variant: $(VARIANT)" 1>&2 )
  BANNER := $(shell echo "  System: $(HOST_SYSTEM) [$(BYTE_ORDER_PREFIX)-endian]" 1>&2 )
  BANNER := $(shell echo "   Build: $(MODE)" 1>&2 )
  BANNER := $(shell echo 1>&2 )
  export BANNER # prevent multiple banners on recursive make calls
  MAKEFLAGS += BANNER=1
endif

## Determine CPU type

ifeq ($(HOST_SYSTEM), Darwin)
  CPU_TYPE := powerpc
endif

## TODO: Sparc detection for SunOS?
## TODO: Base CPU type on real information, not just generic OS variant

## CPU-type specific overrides. Any of the variables above may be changed here.

ifeq ($(CPU_TYPE), i386)
  CFLAGS += -m$(WORD_SIZE)
endif

## Platform specific overrides. Any of the variables above may be changed here.

ifeq ($(HOST_SYSTEM), AIX)
  LIB_SO_EXT  := .a
  PLUGINS     := platform time posix pipe
endif

ifeq ($(HOST_SYSTEM), BeOS)
  PLATFORM  := beos
endif

ifeq ($(findstring CYGWIN,$(HOST_SYSTEM)), CYGWIN)
  PLATFORM   := windows
  LDFLAGS    += -no-undefined
  LIBS       := -lm
  LIB_SO_EXT := .dll
# DEVNULL    := NUL # Required if using cmd.exe and not bash.
endif

ifeq ($(HOST_SYSTEM), Darwin)
  LIBTOOL   := MACOSX_DEPLOYMENT_TARGET=10.3 glibtool
  # Work around G4 crashes with GCC 4.0.
  # TODO: Should be CPU specific.
  COPTFLAGS := $(subst -DNDEBUG=1,,$(COPTFLAGS))
endif

ifeq ($(HOST_SYSTEM), DragonFly)
  LIBS      := -lm
endif

ifeq ($(HOST_SYSTEM), FreeBSD)
  LIBS      := -lm -lc_r
  LIBTOOL  := libtool13
endif

ifeq ($(HOST_SYSTEM), HP-UX)
  LIBS       := -lm -ldld
  LIB_SO_EXT := .sl
  PLUGINS    := socket platform time posix pipe
endif

ifeq ($(HOST_SYSTEM), Linux)
endif

ifeq ($(findstring MINGW,$(HOST_SYSTEM)), MINGW)
  PLATFORM  := windows
  LIBS      := -lm
endif

ifeq ($(HOST_SYSTEM), NetBSD)
  LIBS      := -lm
endif

ifeq ($(HOST_SYSTEM), SunOS)
  PLUGINS   := socket platform time posix pipe
  # Work around GCC Ultra SPARC alignment bug
  # TODO: Should be CPU specific.
  COPTFLAGS := $(subst -O2,-O0, $(COPTFLAGS))
endif

SOURCES     := $(wildcard $(platformdir)/*.c) $(wildcard $(platformdir)/$(PLATFORM)/*.c) $(VM).c
OBJS        := $(subst .c,.o,$(SOURCES))
SDLVMOBJS   := $(subst vm.o,sdlvm.o,$(OBJS))