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 # Support IA32 and x86_64 platforms with one build
  20 # Set up architecture specifics; for cross compilation, set ARCH as apt
  21 GCCOPT := $(call gcc_ok,-std=gnu99,)
  22 ifeq ($(ARCH),i386)
  23         GCCOPT += $(call gcc_ok,-m32,)
  24         GCCOPT += $(call gcc_ok,-march=i386)
  25         GCCOPT += $(call gcc_ok,-mpreferred-stack-boundary=2,)
  26 endif
  27 ifeq ($(ARCH),x86_64)
  28         GCCOPT += $(call gcc_ok,-m64,)
  29         GCCOPT += $(call gcc_ok,-march=x86-64)
  30         #let preferred-stack-boundary be default (=4)
  31 endif
  32 GCCOPT += -Os -fomit-frame-pointer
  33 GCCOPT += $(call gcc_ok,-fno-stack-protector,)
  34 GCCOPT += $(call gcc_ok,-fwrapv,)
  35 GCCOPT += $(call gcc_ok,-freg-struct-return,)
  36 GCCOPT += $(call gcc_ok,-fno-exceptions,)
  37 GCCOPT += $(call gcc_ok,-fno-asynchronous-unwind-tables,)
  38 # Note -fPIE does not work with ld on x86_64, try -fPIC instead
  39 # Does BIOS build depend on -fPIE?
  40 GCCOPT += $(call gcc_ok,-fPIC)
  41 GCCOPT += $(call gcc_ok,-falign-functions=0,-malign-functions=0)
  42 GCCOPT += $(call gcc_ok,-falign-jumps=0,-malign-jumps=0)
  43 GCCOPT += $(call gcc_ok,-falign-labels=0,-malign-labels=0)
  44 GCCOPT += $(call gcc_ok,-falign-loops=0,-malign-loops=0)
  45
  46 com32 = $(topdir)/com32
  47 core = $(topdir)/core
  48
  49 ifneq ($(NOGPL),1)
  50 GPLLIB     = $(objdir)/com32/gpllib/libgpl.c32
  51 GPLINCLUDE = -I$(com32)/gplinclude
  52 else
  53 GPLLIB     =
  54 GPLINCLUDE =
  55 endif
  56
  57 CFLAGS     = $(GCCOPT) $(GCCWARN) -W -Wall \
  58              -fomit-frame-pointer -D__COM32__ -DDYNAMIC_MODULE \
  59              -nostdinc -iwithprefix include \
  60              -I$(com32)/libutil/include -I$(com32)/include \
  61                 -I$(com32)/include/sys $(GPLINCLUDE) -I$(core)/include \
  62                 -I$(objdir) -DLDLINUX=\"$(LDLINUX)\"
  63 ifndef EFI_BUILD
  64 CFLAGS    += -mregparm=3 -DREGPARM=3
  65 endif
  66
  67 SFLAGS     = $(GCCOPT) -D__COM32__
  68 LDFLAGS    = -m elf_$(ARCH) -shared --hash-style=gnu -T $(com32)/lib/$(ARCH)/elf.ld --as-needed
  69 LIBGCC    := $(shell $(CC) $(GCCOPT) --print-libgcc)
  70
  71 LNXCFLAGS  = -I$(com32)/libutil/include -W -Wall -O -g -D_GNU_SOURCE
  72 LNXSFLAGS  = -g
  73 LNXLDFLAGS = -g
  74
  75 C_LIBS     += $(objdir)/com32/libutil/libutil.c32 $(GPLLIB) \
  76              $(objdir)/com32/lib/libcom32.c32
  77 C_LNXLIBS  = $(objdir)/com32/libutil/libutil_lnx.a \
  78              $(objdir)/com32/elflink/ldlinux/ldlinux_lnx.a
  79
  80 .SUFFIXES: .lss .c .o
  81
  82 .PRECIOUS: %.o
  83 %.o: %.S
  84         $(CC) $(SFLAGS) -c -o $@ $<
  85
  86 .PRECIOUS: %.o
  87 %.o: %.c
  88         $(CC) $(CFLAGS) -c -o $@ $<
  89
  90 .PRECIOUS: %.lo
  91 %.lo: %.S
  92         $(CC) $(LNXSFLAGS) -c -o $@ $<
  93
  94 .PRECIOUS: %.lo
  95 %.lo: %.c
  96         $(CC) $(LNXCFLAGS) -c -o $@ $<
  97
  98 .PRECIOUS: %.lnx
  99 %.lnx: %.lo $(LNXLIBS) $(C_LNXLIBS)
 100         $(CC) $(LNXCFLAGS) -o $@ $^
 101
 102 .PRECIOUS: %.elf
 103 %.elf: %.o $(C_LIBS)
 104         $(LD) $(LDFLAGS) -o $@ $^
 105
 106 %.c32: %.elf
 107         $(OBJCOPY) --strip-debug --strip-unneeded $< $@