1# Force i386-only instructions
2#
3CFLAGS		+= -march=i386
4
5# Code size reduction.
6#
7CFLAGS		+= -fomit-frame-pointer
8
9# Code size reduction.
10#
11ifeq ($(CCTYPE),gcc)
12CFLAGS		+= -fstrength-reduce
13endif
14
15# Code size reduction.  gcc3 needs a different syntax to gcc2 if you
16# want to avoid spurious warnings.
17#
18ifeq ($(CCTYPE),gcc)
19GCC_VERSION	:= $(subst ., ,$(shell $(CC) -dumpversion))
20GCC_MAJOR	:= $(firstword $(GCC_VERSION))
21ifeq ($(GCC_MAJOR),2)
22CFLAGS		+= -malign-jumps=1 -malign-loops=1 -malign-functions=1
23else
24CFLAGS		+= -falign-jumps=1 -falign-loops=1 -falign-functions=1
25endif # gcc2
26endif # gcc
27
28# Code size reduction.  This is almost always a win.  The kernel uses
29# it, too.
30#
31ifeq ($(CCTYPE),gcc)
32CFLAGS		+= -mpreferred-stack-boundary=2
33endif
34
35# Code size reduction.  Use regparm for all functions - C functions
36# called from assembly (or vice versa) need __asmcall now
37#
38CFLAGS		+= -mregparm=3
39
40# Code size reduction.  Use -mrtd (same __asmcall requirements as above)
41ifeq ($(CCTYPE),gcc)
42CFLAGS		+= -mrtd
43endif
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#
49CFLAGS		+= -freg-struct-return
50
51# Force 32-bit code even on an x86-64 machine
52#
53CFLAGS		+= -m32
54ASFLAGS		+= --32
55ifeq ($(HOST_OS),FreeBSD)
56LDFLAGS		+= -m elf_i386_fbsd
57else ifeq ($(HOST_OS),OpenBSD)
58LDFLAGS		+= -m elf_i386_obsd
59else
60LDFLAGS		+= -m elf_i386
61endif
62
63# EFI requires -fshort-wchar, and nothing else currently uses wchar_t
64#
65CFLAGS		+= -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#
70CFLAGS			+= -Ui386
71
72# i386-specific directories containing source files
73#
74SRCDIRS		+= arch/i386/core
75SRCDIRS		+= arch/i386/tests
76
77# Include common x86 Makefile
78#
79MAKEDEPS	+= arch/x86/Makefile
80include arch/x86/Makefile
81
82# Include platform-specific Makefile
83#
84MAKEDEPS	+= arch/i386/Makefile.$(PLATFORM)
85include arch/i386/Makefile.$(PLATFORM)
86