add a header file in xen and use the file in two directions

I want to add a header my_header.h in xen/include/public/ and use it in xen's tool; so this my_header.h should also be linked to tools/include/xen/

However, it does NOT work. When I recompile, Make tools create the soft links for all of the old files (except my_header.h) under xen/include/public.

My question is:

Do I need to change anything in tools/include/Makefile?

The tools/include/Makefile is as follows:

XEN_ROOT = $(CURDIR)/../..
include $(XEN_ROOT)/tools/Rules.mk

.PHONY: all
all: xen-foreign xen/.dir

.PHONY: xen-foreign
xen-foreign:
    $(MAKE) -C xen-foreign

xen/.dir:
    @rm -rf xen
    mkdir -p xen/libelf
    ln -sf $(XEN_ROOT)/xen/include/public/COPYING xen
    ln -sf $(XEN_ROOT)/xen/include/public/my_header.h xen
    ln -sf $(wildcard $(XEN_ROOT)/xen/include/public/*.h) xen
    ln -sf $(addprefix $(XEN_ROOT)/xen/include/public/,arch-x86 hvm io xsm) xen
    ln -sf ../xen-sys/$(XEN_OS) xen/sys
    ln -sf $(addprefix $(XEN_ROOT)/xen/include/xen/,libelf.h elfstructs.h) xen/libelf/
    ln -s ../xen-foreign xen/foreign
    touch $@

.PHONY: install
install: all
    $(INSTALL_DIR) $(DESTDIR)$(INCLUDEDIR)/xen/arch-x86
    $(INSTALL_DIR) $(DESTDIR)$(INCLUDEDIR)/xen/arch-x86/hvm
    $(INSTALL_DIR) $(DESTDIR)$(INCLUDEDIR)/xen/foreign
    $(INSTALL_DIR) $(DESTDIR)$(INCLUDEDIR)/xen/hvm
    $(INSTALL_DIR) $(DESTDIR)$(INCLUDEDIR)/xen/io
    $(INSTALL_DIR) $(DESTDIR)$(INCLUDEDIR)/xen/sys
    $(INSTALL_DIR) $(DESTDIR)$(INCLUDEDIR)/xen/xsm
    $(INSTALL_DATA) xen/COPYING $(DESTDIR)$(INCLUDEDIR)/xen
    $(INSTALL_DATA) xen/*.h $(DESTDIR)$(INCLUDEDIR)/xen
    $(INSTALL_DATA) xen/arch-x86/*.h $(DESTDIR)$(INCLUDEDIR)/xen/arch-x86
    $(INSTALL_DATA) xen/arch-x86/hvm/*.h $(DESTDIR)$(INCLUDEDIR)/xen/arch-x86/hvm
    $(INSTALL_DATA) xen/foreign/*.h $(DESTDIR)$(INCLUDEDIR)/xen/foreign
    $(INSTALL_DATA) xen/hvm/*.h $(DESTDIR)$(INCLUDEDIR)/xen/hvm
    $(INSTALL_DATA) xen/io/*.h $(DESTDIR)$(INCLUDEDIR)/xen/io
    $(INSTALL_DATA) xen/sys/*.h $(DESTDIR)$(INCLUDEDIR)/xen/sys
    $(INSTALL_DATA) xen/xsm/*.h $(DESTDIR)$(INCLUDEDIR)/xen/xsm

.PHONY: clean 
clean:
    rm -rf xen
    $(MAKE) -C xen-foreign clean

In my understanding, it should create the link for my_header.h, but I don't know why it does NOT.

Solution

Did you delete the xen/.dir file? That file has no prerequisites, which means that if it exists make assumes that it's up to date. So changing the rule won't have any effect, unless you also delete that file.