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# Force i386-only instructions
#
CFLAGS += -march=i386
# Code size reduction.
#
CFLAGS += -fomit-frame-pointer
# Code size reduction.
#
ifeq ($(CCTYPE),gcc)
CFLAGS += -fstrength-reduce
endif
# Code size reduction. gcc3 needs a different syntax to gcc2 if you
# want to avoid spurious warnings.
#
ifeq ($(CCTYPE),gcc)
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 # gcc2
endif # gcc
# Code size reduction. This is almost always a win. The kernel uses
# it, too.
#
ifeq ($(CCTYPE),gcc)
CFLAGS += -mpreferred-stack-boundary=2
endif
# Code size reduction. Use regparm for all functions - C functions
# called from assembly (or vice versa) need __asmcall now
#
CFLAGS += -mregparm=3
# Code size reduction. Use -mrtd (same __asmcall requirements as above)
ifeq ($(CCTYPE),gcc)
CFLAGS += -mrtd
endif
# 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
ifeq ($(HOST_OS),FreeBSD)
LDFLAGS += -m elf_i386_fbsd
else ifeq ($(HOST_OS),OpenBSD)
LDFLAGS += -m elf_i386_obsd
else
LDFLAGS += -m elf_i386
endif
# 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
# Some widespread patched versions of gcc include -fPIE -Wl,-pie by
# default. Note that gcc will exit *successfully* if it fails to
# recognise an option that starts with "no", so we have to test for
# output on stderr instead of checking the exit status.
#
# Current versions of gcc require -no-pie; older versions require
# -nopie. We therefore test for both.
#
ifeq ($(CCTYPE),gcc)
PIE_TEST = [ -z "`$(CC) -fno-PIE -no-pie -x c -c /dev/null -o /dev/null 2>&1`" ]
PIE_FLAGS := $(shell $(PIE_TEST) && $(ECHO) '-fno-PIE -no-pie')
PIE_TEST2 = [ -z "`$(CC) -fno-PIE -nopie -x c -c /dev/null -o /dev/null 2>&1`" ]
PIE_FLAGS2 := $(shell $(PIE_TEST2) && $(ECHO) '-fno-PIE -nopie')
WORKAROUND_CFLAGS += $(PIE_FLAGS) $(PIE_FLAGS2)
endif
# i386-specific directories containing source files
#
SRCDIRS += arch/i386/core
SRCDIRS += arch/i386/tests
# Include common x86 Makefile
#
MAKEDEPS += arch/x86/Makefile
include arch/x86/Makefile
# Include platform-specific Makefile
#
MAKEDEPS += arch/i386/Makefile.$(PLATFORM)
include arch/i386/Makefile.$(PLATFORM)
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