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