mk/embedded.mk

   1 ## -*- makefile -*- ------------------------------------------------------
   2 ##
   3 ##   Copyright 2001-2008 H. Peter Anvin - All Rights Reserved
   4 ##
   5 ##   This program is free software; you can redistribute it and/or modify
   6 ##   it under the terms of the GNU General Public License as published by
   7 ##   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
   8 ##   Boston MA 02111-1307, USA; either version 2 of the License, or
   9 ##   (at your option) any later version; incorporated herein by reference.
  10 ##
  11 ## -----------------------------------------------------------------------
  12
  13 ##
  14 ## Make configuration for embedded directories
  15 ##
  16
  17 include $(MAKEDIR)/syslinux.mk
  18
  19 # Support IA32 and x86_64 platforms with one build
  20 # Set up architecture specifics; for cross compilation, set ARCH as apt
  21 # Initialize GCCOPT to null to begin with. Without this, make generates
  22 # recursive error for GCCOPT
  23 GCCOPT :=
  24 ifeq ($(ARCH),i386)
  25         GCCOPT := $(call gcc_ok,-m32)
  26         GCCOPT += $(call gcc_ok,-march=i386)
  27         GCCOPT    += $(call gcc_ok,-mpreferred-stack-boundary=2,)
  28         GCCOPT    += $(call gcc_ok,-mincoming-stack-boundary=2,)
  29 endif
  30 ifeq ($(ARCH),x86_64)
  31         GCCOPT := $(call gcc_ok,-m64)
  32         GCCOPT += $(call gcc_ok,-march=x86-64)
  33         #let preferred-stack-boundary and incoming-stack-boundary be default(=4)
  34 # Somewhere down the line ld barfs requiring -fPIC
  35         GCCOPT += $(call gcc_ok,-fPIC)
  36 endif
  37 GCCOPT    += $(call gcc_ok,-ffreestanding,)
  38 GCCOPT    += $(call gcc_ok,-fno-stack-protector,)
  39 GCCOPT    += $(call gcc_ok,-fwrapv,)
  40 GCCOPT    += $(call gcc_ok,-freg-struct-return,)
  41 ifeq ($(FWCLASS),EFI)
  42 GCCOPT    += -Os -fomit-frame-pointer -msoft-float -mno-red-zone
  43 else
  44 GCCOPT    += -Os -fomit-frame-pointer -mregparm=3 -DREGPARM=3 -msoft-float
  45 endif
  46 GCCOPT    += $(call gcc_ok,-fno-exceptions,)
  47 GCCOPT    += $(call gcc_ok,-fno-asynchronous-unwind-tables,)
  48 GCCOPT    += $(call gcc_ok,-fno-strict-aliasing,)
  49 GCCOPT    += $(call gcc_ok,-falign-functions=0,-malign-functions=0)
  50 GCCOPT    += $(call gcc_ok,-falign-jumps=0,-malign-jumps=0)
  51 GCCOPT    += $(call gcc_ok,-falign-labels=0,-malign-labels=0)
  52 GCCOPT    += $(call gcc_ok,-falign-loops=0,-malign-loops=0)
  53 GCCOPT    += $(call gcc_ok,-fvisibility=hidden)
  54
  55 LIBGCC    := $(shell $(CC) $(GCCOPT) --print-libgcc)
  56
  57 LD        += -m elf_$(ARCH)
  58
  59 # Note: use += for CFLAGS and SFLAGS in case something is set in MCONFIG.local
  60 CFLAGS    += $(GCCOPT) -g $(GCCWARN) -Wno-sign-compare $(OPTFLAGS) $(INCLUDES)
  61 SFLAGS    += $(CFLAGS) -D__ASSEMBLY__
  62
  63 .SUFFIXES: .c .o .S .s .i .elf .com .bin .asm .lst .c32 .lss
  64
  65 %.o: %.c
  66         $(CC) $(MAKEDEPS) $(CFLAGS) -c -o $@ $<
  67 %.i: %.c
  68         $(CC) $(MAKEDEPS) $(CFLAGS) -E -o $@ $<
  69 %.s: %.c
  70         $(CC) $(MAKEDEPS) $(CFLAGS) -S -o $@ $<
  71 %.o: %.S
  72         $(CC) $(MAKEDEPS) $(SFLAGS) -Wa,-a=$*.lst -c -o $@ $<
  73 %.s: %.S
  74         $(CC) $(MAKEDEPS) $(SFLAGS) -E -o $@ $<