mk/elf.mk

   1 ## -*- makefile -*- -------------------------------------------------------
   2 ##
   3 ##   Copyright 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., 51 Franklin St, Fifth Floor,
   8 ##   Boston MA 02110-1301, USA; either version 2 of the License, or
   9 ##   (at your option) any later version; incorporated herein by reference.
  10 ##
  11 ## -----------------------------------------------------------------------
  12
  13 ##
  14 ## ELF common configurables
  15 ##
  16
  17 include $(MAKEDIR)/syslinux.mk
  18
  19 GCCOPT := $(call gcc_ok,-std=gnu99,)
  20 GCCOPT += $(call gcc_ok,-m32,)
  21 GCCOPT += $(call gcc_ok,-fno-stack-protector,)
  22 GCCOPT += $(call gcc_ok,-fwrapv,)
  23 GCCOPT += $(call gcc_ok,-freg-struct-return,)
  24 GCCOPT += -march=i386 -Os -fomit-frame-pointer -mregparm=3 -DREGPARM=3
  25 GCCOPT += $(call gcc_ok,-fno-exceptions,)
  26 GCCOPT += $(call gcc_ok,-fno-asynchronous-unwind-tables,)
  27 GCCOPT += $(call gcc_ok,-fPIE,-fPIC)
  28 GCCOPT += $(call gcc_ok,-falign-functions=0,-malign-functions=0)
  29 GCCOPT += $(call gcc_ok,-falign-jumps=0,-malign-jumps=0)
  30 GCCOPT += $(call gcc_ok,-falign-labels=0,-malign-labels=0)
  31 GCCOPT += $(call gcc_ok,-falign-loops=0,-malign-loops=0)
  32 GCCOPT += $(call gcc_ok,-mpreferred-stack-boundary=2,)
  33
  34 com32 = $(topdir)/com32
  35 core = $(topdir)/core
  36
  37 ifneq ($(NOGPL),1)
  38 GPLLIB     = $(com32)/gpllib/libgpl.c32
  39 GPLINCLUDE = -I$(com32)/gplinclude
  40 else
  41 GPLLIB     =
  42 GPLINCLUDE =
  43 endif
  44
  45 CFLAGS     = $(GCCOPT) -W -Wall -march=i386 \
  46              -fomit-frame-pointer -D__COM32__ -DDYNAMIC_MODULE \
  47              -nostdinc -iwithprefix include \
  48              -I$(com32)/libutil/include -I$(com32)/include $(GPLINCLUDE) \
  49              -I$(core)/include
  50 SFLAGS     = $(GCCOPT) -D__COM32__ -march=i386
  51 LDFLAGS    = -m elf_i386 -shared --hash-style=gnu -T $(com32)/lib/elf32.ld --as-needed
  52
  53 LNXCFLAGS  = -I$(com32)/libutil/include -W -Wall -O -g -D_GNU_SOURCE
  54 LNXSFLAGS  = -g
  55 LNXLDFLAGS = -g
  56
  57 C_LIBS     = $(com32)/libutil/libutil.c32 $(GPLLIB) \
  58              $(com32)/lib/libcom32.c32
  59 C_LNXLIBS  = $(com32)/libutil/libutil_lnx.a \
  60              $(com32)/elflink/ldlinux/ldlinux_lnx.a
  61
  62 .SUFFIXES: .lss .c .o
  63
  64 .PRECIOUS: %.o
  65 %.o: %.S
  66         $(CC) $(SFLAGS) -c -o $@ $<
  67
  68 .PRECIOUS: %.o
  69 %.o: %.c
  70         $(CC) $(CFLAGS) -c -o $@ $<
  71
  72 .PRECIOUS: %.lo
  73 %.lo: %.S
  74         $(CC) $(LNXSFLAGS) -c -o $@ $<
  75
  76 .PRECIOUS: %.lo
  77 %.lo: %.c
  78         $(CC) $(LNXCFLAGS) -c -o $@ $<
  79
  80 .PRECIOUS: %.lnx
  81 %.lnx: %.lo $(LNXLIBS) $(C_LNXLIBS)
  82         $(CC) $(LNXCFLAGS) -o $@ $^
  83
  84 .PRECIOUS: %.elf
  85 %.elf: %.o $(C_LIBS)
  86         $(LD) $(LDFLAGS) -o $@ $^
  87
  88 %.c32: %.elf
  89         $(OBJCOPY) --strip-debug --strip-unneeded $< $@