ipxe/src/arch/i386/Makefile

# Force i386-only instructions
#
CFLAGS		+= -march=i386

# Code size reduction.
#
CFLAGS		+= -fstrength-reduce -fomit-frame-pointer

# Code size reduction.  gcc3 needs a different syntax to gcc2 if you
# want to avoid spurious warnings.
#
GCC_VERSION	:= $(subst ., ,$(shell $(CC) -dumpversion))
GCC_MAJOR	:= $(firstword $(GCC_VERSION))
ifeq ($(GCC_MAJOR),2)
CFLAGS		+= -malign-jumps=1 -malign-loops=1 -malign-functions=1
else
CFLAGS		+= -falign-jumps=1 -falign-loops=1 -falign-functions=1
endif

# Code size reduction.  This is almost always a win.  The kernel uses it, too.
#
CFLAGS		+= -mpreferred-stack-boundary=2

# Code size reduction.  Use regparm for all functions - C functions
# called from assembly (or vice versa) need __cdecl now
#
CFLAGS		+= -mregparm=3

# Code size reduction.  Use -mrtd (same __cdecl requirements as above)
CFLAGS		+= -mrtd

# Code size reduction.  This is the logical complement to -mregparm=3.
# It doesn't currently buy us anything, but if anything ever tries to
# return small structures, let's be prepared
#
CFLAGS		+= -freg-struct-return

# Force 32-bit code even on an x86-64 machine
#
CFLAGS		+= -m32
ASFLAGS         += --32
LDFLAGS         += -m elf_i386

# EFI requires -fshort-wchar, and nothing else currently uses wchar_t
#
CFLAGS		+= -fshort-wchar

# We need to undefine the default macro "i386" when compiling .S
# files, otherwise ".arch i386" translates to ".arch 1"...
#
CFLAGS			+= -Ui386

# Locations of utilities
#
ISOLINUX_BIN	= /usr/lib/syslinux/isolinux.bin

# i386-specific directories containing source files
#
SRCDIRS		+= arch/i386/core arch/i386/transitions arch/i386/prefix
SRCDIRS		+= arch/i386/firmware/pcbios
SRCDIRS		+= arch/i386/image
SRCDIRS		+= arch/i386/drivers
SRCDIRS		+= arch/i386/drivers/net
SRCDIRS		+= arch/i386/interface/pcbios
SRCDIRS		+= arch/i386/interface/pxe
SRCDIRS 	+= arch/i386/interface/syslinux

# The various xxx_loader.c files are #included into core/loader.c and
# should not be compiled directly.
#
NON_AUTO_SRCS	+= arch/i386/core/aout_loader.c
NON_AUTO_SRCS	+= arch/i386/core/freebsd_loader.c
NON_AUTO_SRCS	+= arch/i386/core/wince_loader.c

# unnrv2b.S is used to generate a 16-bit as well as a 32-bit object.
#
OBJS_unnrv2b	= unnrv2b unnrv2b16
CFLAGS_unnrv2b16 = -DCODE16

# Include platform-specific Makefile
#
MAKEDEPS	+= arch/i386/Makefile.$(PLATFORM)
include arch/i386/Makefile.$(PLATFORM)

# Some suffixes (e.g. %.fd0) are generated directly from other
# finished files (e.g. %.dsk), rather than having their own prefix.

# rule to write disk images to /dev/fd0
NON_AUTO_MEDIA	+= fd0
%fd0 : %dsk
	dd if=$< bs=512 conv=sync of=/dev/fd0
	sync

# rule to create padded disk images
NON_AUTO_MEDIA	+= pdsk
%pdsk : %dsk
	cp $< $@
	$(PERL) ./util/dskpad.pl $@

# Add NON_AUTO_MEDIA to the media list, so that they show up in the
# output of "make"
#
MEDIA		+= $(NON_AUTO_MEDIA)