src/arch/i386/Makefile

   1 # Force i386-only instructions
   2 #
   3 CFLAGS          += -march=i386
   4
   5 # Code size reduction.
   6 #
   7 CFLAGS          += -fomit-frame-pointer
   8
   9 # Code size reduction.
  10 #
  11 ifeq ($(CCTYPE),gcc)
  12 CFLAGS          += -fstrength-reduce
  13 endif
  14
  15 # Code size reduction.  gcc3 needs a different syntax to gcc2 if you
  16 # want to avoid spurious warnings.
  17 #
  18 ifeq ($(CCTYPE),gcc)
  19 GCC_VERSION     := $(subst ., ,$(shell $(CC) -dumpversion))
  20 GCC_MAJOR       := $(firstword $(GCC_VERSION))
  21 ifeq ($(GCC_MAJOR),2)
  22 CFLAGS          += -malign-jumps=1 -malign-loops=1 -malign-functions=1
  23 else
  24 CFLAGS          += -falign-jumps=1 -falign-loops=1 -falign-functions=1
  25 endif # gcc2
  26 endif # gcc
  27
  28 # Code size reduction.  This is almost always a win.  The kernel uses
  29 # it, too.
  30 #
  31 ifeq ($(CCTYPE),gcc)
  32 CFLAGS          += -mpreferred-stack-boundary=2
  33 endif
  34
  35 # Code size reduction.  Use regparm for all functions - C functions
  36 # called from assembly (or vice versa) need __asmcall now
  37 #
  38 CFLAGS          += -mregparm=3
  39
  40 # Code size reduction.  Use -mrtd (same __asmcall requirements as above)
  41 ifeq ($(CCTYPE),gcc)
  42 CFLAGS          += -mrtd
  43 endif
  44
  45 # Code size reduction.  This is the logical complement to -mregparm=3.
  46 # It doesn't currently buy us anything, but if anything ever tries to
  47 # return small structures, let's be prepared
  48 #
  49 CFLAGS          += -freg-struct-return
  50
  51 # Force 32-bit code even on an x86-64 machine
  52 #
  53 CFLAGS          += -m32
  54 ASFLAGS         += --32
  55 ifeq ($(HOST_OS),FreeBSD)
  56 LDFLAGS         += -m elf_i386_fbsd
  57 else ifeq ($(HOST_OS),OpenBSD)
  58 LDFLAGS         += -m elf_i386_obsd
  59 else
  60 LDFLAGS         += -m elf_i386
  61 endif
  62
  63 # EFI requires -fshort-wchar, and nothing else currently uses wchar_t
  64 #
  65 CFLAGS          += -fshort-wchar
  66
  67 # We need to undefine the default macro "i386" when compiling .S
  68 # files, otherwise ".arch i386" translates to ".arch 1"...
  69 #
  70 CFLAGS                  += -Ui386
  71
  72 # i386-specific directories containing source files
  73 #
  74 SRCDIRS         += arch/i386/core
  75 SRCDIRS         += arch/i386/tests
  76
  77 # Include common x86 Makefile
  78 #
  79 MAKEDEPS        += arch/x86/Makefile
  80 include arch/x86/Makefile
  81
  82 # Include platform-specific Makefile
  83 #
  84 MAKEDEPS        += arch/i386/Makefile.$(PLATFORM)
  85 include arch/i386/Makefile.$(PLATFORM)