debian/rules.d, debian/rules.real: Restore build of userland headers for tools

Since commit f5f169ba99 "Split build rules for tools to allow
skipping them." debian/rules.d/Makefile is not used and the current
kernel's UAPI headers are not installed.  This hasn't caused breakage
yet, probably because many tools have their own workaround using
include/uapi etc. directly, but could break backports builds at some
point.

Move the build of userland headers up into debian/rules.real and
make all tools build targets depend on it.

debian/changelog

@@ -1,10 +1,15 @@
 linux (4.19.16-2) UNRELEASED; urgency=medium
 
+  [ Luca Boccassi ]
   * Do not generate linux-source-$ver stanza in debian/control if
     source is set to disabled in debian/config/defines.
   * linux-perf: explicitly disable the jvmti feature and shared library.
   * Document pkg.linux.nosource in debian/README.source.
 
+  [ Ben Hutchings ]
+  * debian/rules.d, debian/rules.real: Restore build of userland headers for
+    tools
+
  -- Luca Boccassi <bluca@debian.org>  Fri, 18 Jan 2019 19:09:06 +0000
 
 linux (4.19.16-1) unstable; urgency=medium

debian/rules.d/Makefile

@@ -12,11 +12,3 @@ ifneq ($(filter powerpc powerpcspe ppc64,$(DEB_HOST_ARCH)),)
 endif
 
 include $(top_rulesdir)/Makefile.inc
-
-# Build userland headers first
-unexport VERSION
-all-local:
-	mkdir -p headers-tools
-	$(MAKE) -C $(top_srcdir) ARCH=$(KERNEL_ARCH) O=$(CURDIR)/headers-tools \
-		INSTALL_HDR_PATH=$(CURDIR) headers_install
-all-recursive: all-local

debian/rules.real

@@ -596,7 +596,14 @@ define make-tools
 +mkdir -p $(BUILD_DIR)/build-tools/$(1) && $(MAKE_CLEAN) -C $(BUILD_DIR)/build-tools/$(1) -f $(CURDIR)/debian/rules.d/$(1)/Makefile top_srcdir=$(CURDIR) top_rulesdir=$(CURDIR)/debian/rules.d OUTDIR=$(1) VERSION=$(VERSION) KERNEL_ARCH=$(KERNEL_ARCH)
 endef
 
-build-kbuild:
+$(STAMPS_DIR)/build-tools-headers:
+	mkdir -p $(BUILD_DIR)/build-tools/headers-tools
+	$(MAKE) ARCH=$(KERNEL_ARCH) O=$(BUILD_DIR)/build-tools/headers-tools \
+		INSTALL_HDR_PATH=$(CURDIR)/$(BUILD_DIR)/build-tools \
+		headers_install
+	@$(stamp)
+
+build-kbuild: $(STAMPS_DIR)/build-tools-headers
 	$(call make-tools,scripts)
 	$(call make-tools,tools/objtool)
 
@@ -624,7 +631,7 @@ endif
 	dh_md5sums
 	dh_builddeb
 
-build-cpupower:
+build-cpupower: $(STAMPS_DIR)/build-tools-headers
 	$(call make-tools,tools/power/cpupower)
 ifneq ($(filter i386 amd64 x32,$(DEB_HOST_ARCH)),)
 	$(call make-tools,tools/power/x86)
@@ -664,7 +671,7 @@ endif
 	dh_md5sums
 	dh_builddeb
 
-build-perf:
+build-perf: $(STAMPS_DIR)/build-tools-headers
 	$(call make-tools,tools/perf)
 
 install-perf: PACKAGE_NAME = linux-perf-$(VERSION)
@@ -693,7 +700,7 @@ endif
 	dh_md5sums
 	dh_builddeb
 
-build-usbip:
+build-usbip: $(STAMPS_DIR)/build-tools-headers
 	$(call make-tools,tools/usb/usbip)
 
 install-usbip: DH_OPTIONS = -pusbip
@@ -721,7 +728,7 @@ endif
 	dh_md5sums
 	dh_builddeb
 
-build-hyperv-daemons:
+build-hyperv-daemons: $(STAMPS_DIR)/build-tools-headers
 	$(call make-tools,tools/hv)
 
 install-hyperv-daemons: PACKAGE_NAME = hyperv-daemons
@@ -759,7 +766,7 @@ endif
 	dh_md5sums
 	dh_builddeb
 
-build-libbpf:
+build-libbpf: $(STAMPS_DIR)/build-tools-headers
 	$(call make-tools,tools/lib/bpf)
 
 install-libbpf: DH_OPTIONS = -plibbpf$(VERSION) -plibbpf-dev
@@ -787,7 +794,7 @@ endif
 	dh_md5sums
 	dh_builddeb
 
-build-liblockdep:
+build-liblockdep: $(STAMPS_DIR)/build-tools-headers
 	$(call make-tools,tools/lib/lockdep)
 
 install-liblockdep: DH_OPTIONS = -pliblockdep$(VERSION) -pliblockdep-dev
@@ -838,7 +845,7 @@ endif
 	dh_md5sums
 	dh_builddeb
 
-build-bootwrapper:
+build-bootwrapper: $(STAMPS_DIR)/build-tools-headers
 	$(call make-tools,arch/powerpc/boot)
 
 install-bootwrapper: PACKAGE_NAME = linux-bootwrapper-$(ABINAME)