linux/arch/x86_64/ia32/Makefile

#
# Makefile for the ia32 kernel emulation subsystem.
#

obj-$(CONFIG_IA32_EMULATION) := ia32entry.o sys_ia32.o ia32_signal.o tls32.o \
	ia32_binfmt.o fpu32.o ptrace32.o syscall32.o syscall32_syscall.o \
	mmap32.o

sysv-$(CONFIG_SYSVIPC) := ipc32.o
obj-$(CONFIG_IA32_EMULATION) += $(sysv-y)

obj-$(CONFIG_IA32_AOUT) += ia32_aout.o

$(obj)/syscall32_syscall.o: \
	$(foreach F,sysenter syscall,$(obj)/vsyscall-$F.so)

# Teach kbuild about targets
targets := $(foreach F,sysenter syscall,vsyscall-$F.o vsyscall-$F.so)

# The DSO images are built using a special linker script
quiet_cmd_syscall = SYSCALL $@
      cmd_syscall = $(CC) -m32 -nostdlib -shared -s \
			   -Wl,-soname=linux-gate.so.1 -o $@ \
			   -Wl,-T,$(filter-out FORCE,$^)

$(obj)/vsyscall-sysenter.so $(obj)/vsyscall-syscall.so: \
$(obj)/vsyscall-%.so: $(src)/vsyscall.lds $(obj)/vsyscall-%.o FORCE
	$(call if_changed,syscall)

AFLAGS_vsyscall-sysenter.o = -m32 -Wa,-32
AFLAGS_vsyscall-syscall.o = -m32 -Wa,-32