102 lines
2.7 KiB
Makefile
102 lines
2.7 KiB
Makefile
# Force i386-only instructions
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#
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CFLAGS += -march=i386
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# Code size reduction.
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#
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CFLAGS += -fomit-frame-pointer
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# Code size reduction.
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#
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ifeq ($(CCTYPE),gcc)
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CFLAGS += -fstrength-reduce
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endif
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# Code size reduction. gcc3 needs a different syntax to gcc2 if you
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# want to avoid spurious warnings.
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#
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ifeq ($(CCTYPE),gcc)
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GCC_VERSION := $(subst ., ,$(shell $(CC) -dumpversion))
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GCC_MAJOR := $(firstword $(GCC_VERSION))
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ifeq ($(GCC_MAJOR),2)
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CFLAGS += -malign-jumps=1 -malign-loops=1 -malign-functions=1
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else
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CFLAGS += -falign-jumps=1 -falign-loops=1 -falign-functions=1
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endif # gcc2
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endif # gcc
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# Code size reduction. This is almost always a win. The kernel uses
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# it, too.
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#
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ifeq ($(CCTYPE),gcc)
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CFLAGS += -mpreferred-stack-boundary=2
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endif
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# Code size reduction. Use regparm for all functions - C functions
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# called from assembly (or vice versa) need __asmcall now
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#
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CFLAGS += -mregparm=3
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# Code size reduction. Use -mrtd (same __asmcall requirements as above)
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ifeq ($(CCTYPE),gcc)
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CFLAGS += -mrtd
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endif
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# Code size reduction. This is the logical complement to -mregparm=3.
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# It doesn't currently buy us anything, but if anything ever tries to
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# return small structures, let's be prepared
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#
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CFLAGS += -freg-struct-return
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# Force 32-bit code even on an x86-64 machine
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#
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CFLAGS += -m32
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ASFLAGS += --32
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ifeq ($(HOST_OS),FreeBSD)
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LDFLAGS += -m elf_i386_fbsd
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else ifeq ($(HOST_OS),OpenBSD)
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LDFLAGS += -m elf_i386_obsd
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else
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LDFLAGS += -m elf_i386
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endif
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# EFI requires -fshort-wchar, and nothing else currently uses wchar_t
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#
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CFLAGS += -fshort-wchar
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# We need to undefine the default macro "i386" when compiling .S
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# files, otherwise ".arch i386" translates to ".arch 1"...
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#
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CFLAGS += -Ui386
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# Some widespread patched versions of gcc include -fPIE -Wl,-pie by
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# default. Note that gcc will exit *successfully* if it fails to
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# recognise an option that starts with "no", so we have to test for
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# output on stderr instead of checking the exit status.
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#
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# Current versions of gcc require -no-pie; older versions require
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# -nopie. We therefore test for both.
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#
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ifeq ($(CCTYPE),gcc)
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PIE_TEST = [ -z "`$(CC) -fno-PIE -no-pie -x c -c /dev/null -o /dev/null 2>&1`" ]
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PIE_FLAGS := $(shell $(PIE_TEST) && $(ECHO) '-fno-PIE -no-pie')
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PIE_TEST2 = [ -z "`$(CC) -fno-PIE -nopie -x c -c /dev/null -o /dev/null 2>&1`" ]
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PIE_FLAGS2 := $(shell $(PIE_TEST2) && $(ECHO) '-fno-PIE -nopie')
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WORKAROUND_CFLAGS += $(PIE_FLAGS) $(PIE_FLAGS2)
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endif
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# i386-specific directories containing source files
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#
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SRCDIRS += arch/i386/core
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SRCDIRS += arch/i386/tests
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# Include common x86 Makefile
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#
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MAKEDEPS += arch/x86/Makefile
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include arch/x86/Makefile
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# Include platform-specific Makefile
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#
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MAKEDEPS += arch/i386/Makefile.$(PLATFORM)
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include arch/i386/Makefile.$(PLATFORM)
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