[PATCH 35/46] kbuild: change kbuild to not rely on incorrect GNU make behavior

Sam Ravnborg
2006-03-21T16:21:53Z

The kbuild system takes advantage of an incorrect behavior in GNU make.
Once this behavior is fixed, all files in the kernel rebuild every time,
even if nothing has changed. This patch ensures kbuild works with both
the incorrect and correct behaviors of GNU make.

For more details on the incorrect behavior, see:

http://lists.gnu.org/archive/html/bug-make/2006-03/msg00003.html

Changes in this patch:
- Keep all targets that are to be marked .PHONY in a variable, PHONY.
- Add .PHONY: $(PHONY) to mark them properly.
- Remove any $(PHONY) files from the $? list when determining whether
targets are up-to-date or not.

Signed-off-by: Paul Smith <psmith@gnu.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

---

Documentation/DocBook/Makefile | 8 ++++
Makefile | 64 +++++++++++++++++++----------------
arch/arm/Makefile | 5 ++-
arch/arm/boot/Makefile | 5 ++-
arch/arm/boot/bootp/Makefile | 5 ++-
arch/arm26/Makefile | 7 +++-
arch/arm26/boot/Makefile | 5 ++-
arch/i386/Makefile | 4 +-
arch/ia64/Makefile | 5 ++-
arch/m32r/Makefile | 5 ++-
arch/powerpc/Makefile | 2 +
arch/ppc/Makefile | 2 +
arch/ppc/boot/Makefile | 5 ++-
arch/ppc/boot/openfirmware/Makefile | 7 +++-
arch/sh/Makefile | 2 +
arch/um/Makefile | 7 +++-
arch/x86_64/Makefile | 4 +-
scripts/Kbuild.include | 13 ++++---
scripts/Makefile.build | 12 +++++--
scripts/Makefile.clean | 10 ++++-
scripts/Makefile.modinst | 10 ++++-
scripts/Makefile.modpost | 12 +++++--
scripts/kconfig/Makefile | 4 +-
scripts/kconfig/lxdialog/Makefile | 6 ++-
scripts/package/Makefile | 10 +++--
25 files changed, 144 insertions(+), 75 deletions(-)

4f1933620f57145212cdbb1ac6ce099eeeb21c5a
diff --git a/Documentation/DocBook/Makefile b/Documentation/DocBook/Makefile
index 1c95588..2c6f66d 100644
--- a/Documentation/DocBook/Makefile
+++ b/Documentation/DocBook/Makefile
@@ -28,7 +28,7 @@ PS_METHOD = $(prefer-db2x)

###
# The targets that may be used.
-.PHONY: xmldocs sgmldocs psdocs pdfdocs htmldocs mandocs installmandocs
+PHONY += xmldocs sgmldocs psdocs pdfdocs htmldocs mandocs installmandocs

BOOKS := $(addprefix $(obj)/,$(DOCBOOKS))
xmldocs: $(BOOKS)
@@ -211,3 +211,9 @@ clean-dirs := $(patsubst %.xml,%,$(DOCBO

#man put files in man subdir - traverse down
subdir- := man/
+
+
+# Declare the contents of the .PHONY variable as phony. We keep that
+# information in a variable se we can use it in if_changed and friends.
+
+.PHONY: $(PHONY)
diff --git a/Makefile b/Makefile
index 12c8d71..a59c1e2 100644
--- a/Makefile
+++ b/Makefile
@@ -95,7 +95,7 @@ ifdef O
endif

# That's our default target when none is given on the command line
-.PHONY: _all
+PHONY := _all
_all:

ifneq ($(KBUILD_OUTPUT),)
@@ -106,7 +106,7 @@ KBUILD_OUTPUT := $(shell cd $(KBUILD_OUT
$(if $(KBUILD_OUTPUT),, \
$(error output directory "$(saved-output)" does not exist))

-.PHONY: $(MAKECMDGOALS)
+PHONY += $(MAKECMDGOALS)

$(filter-out _all,$(MAKECMDGOALS)) _all:
$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
@@ -123,7 +123,7 @@ ifeq ($(skip-makefile),)

# If building an external module we do not care about the all: rule
# but instead _all depend on modules
-.PHONY: all
+PHONY += all
ifeq ($(KBUILD_EXTMOD),)
_all: all
else
@@ -337,14 +337,14 @@ export RCS_TAR_IGNORE := --exclude SCCS
# Rules shared between *config targets and build targets

# Basic helpers built in scripts/
-.PHONY: scripts_basic
+PHONY += scripts_basic
scripts_basic:
$(Q)$(MAKE) $(build)=scripts/basic

# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;

-.PHONY: outputmakefile
+PHONY += outputmakefile
# outputmakefile generate a Makefile to be placed in output directory, if
# using a seperate output directory. This allows convinient use
# of make in output directory
@@ -420,7 +420,7 @@ ifeq ($(KBUILD_EXTMOD),)
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
# in parrallel
-.PHONY: scripts
+PHONY += scripts
scripts: scripts_basic include/config/MARKER
$(Q)$(MAKE) $(build)=$(@)

@@ -720,7 +720,7 @@ $(sort $(vmlinux-init) $(vmlinux-main))
# make menuconfig etc.
# Error messages still appears in the original language

-.PHONY: $(vmlinux-dirs)
+PHONY += $(vmlinux-dirs)
$(vmlinux-dirs): prepare scripts
$(Q)$(MAKE) $(build)=$@

@@ -773,10 +773,10 @@ kernelrelease = $(KERNELVERSION)$(localv
# version.h and scripts_basic is processed / created.

# Listed in dependency order
-.PHONY: prepare archprepare prepare0 prepare1 prepare2 prepare3
+PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3

# prepare-all is deprecated, use prepare as valid replacement
-.PHONY: prepare-all
+PHONY += prepare-all

# prepare3 is used to check if we are building in a separate output directory,
# and if so do:
@@ -857,7 +857,7 @@ include/linux/version.h: $(srctree)/Make

# ---------------------------------------------------------------------------

-.PHONY: depend dep
+PHONY += depend dep
depend dep:
@echo '*** Warning: make $@ is unnecessary now.'

@@ -872,21 +872,21 @@ all: modules

# Build modules

-.PHONY: modules
+PHONY += modules
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
@echo ' Building modules, stage 2.';
$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost

# Target to prepare building external modules
-.PHONY: modules_prepare
+PHONY += modules_prepare
modules_prepare: prepare scripts

# Target to install modules
-.PHONY: modules_install
+PHONY += modules_install
modules_install: _modinst_ _modinst_post

-.PHONY: _modinst_
+PHONY += _modinst_
_modinst_:
@if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
echo "Warning: you may need to install module-init-tools"; \
@@ -913,7 +913,7 @@ depmod_opts :=
else
depmod_opts := -b $(INSTALL_MOD_PATH) -r
endif
-.PHONY: _modinst_post
+PHONY += _modinst_post
_modinst_post: _modinst_
if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi

@@ -956,7 +956,7 @@ clean: rm-dirs := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))

-.PHONY: $(clean-dirs) clean archclean
+PHONY += $(clean-dirs) clean archclean
$(clean-dirs):
$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

@@ -974,7 +974,7 @@ mrproper: rm-dirs := $(wildcard $(MRPRO
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)

-.PHONY: $(mrproper-dirs) mrproper archmrproper
+PHONY += $(mrproper-dirs) mrproper archmrproper
$(mrproper-dirs):
$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

@@ -984,7 +984,7 @@ mrproper: clean archmrproper $(mrproper-

# distclean
#
-.PHONY: distclean
+PHONY += distclean

distclean: mrproper
@find $(srctree) $(RCS_FIND_IGNORE) \
@@ -1000,7 +1000,7 @@ distclean: mrproper
# rpm target kept for backward compatibility
package-dir := $(srctree)/scripts/package

-.PHONY: %-pkg rpm
+PHONY += %-pkg rpm

%pkg: FORCE
$(Q)$(MAKE) -f $(package-dir)/Makefile $@
@@ -1092,12 +1092,12 @@ else # KBUILD_EXTMOD

# We are always building modules
KBUILD_MODULES := 1
-.PHONY: crmodverdir
+PHONY += crmodverdir
crmodverdir:
$(Q)rm -rf $(MODVERDIR)
$(Q)mkdir -p $(MODVERDIR)

-.PHONY: $(objtree)/Module.symvers
+PHONY += $(objtree)/Module.symvers
$(objtree)/Module.symvers:
@test -e $(objtree)/Module.symvers || ( \
echo; \
@@ -1106,7 +1106,7 @@ $(objtree)/Module.symvers:
echo )

module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
-.PHONY: $(module-dirs) modules
+PHONY += $(module-dirs) modules
$(module-dirs): crmodverdir $(objtree)/Module.symvers
$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)

@@ -1114,11 +1114,11 @@ modules: $(module-dirs)
@echo ' Building modules, stage 2.';
$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost

-.PHONY: modules_install
+PHONY += modules_install
modules_install: _emodinst_ _emodinst_post

-install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
-.PHONY: _emodinst_
+install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
+PHONY += _emodinst_
_emodinst_:
$(Q)rm -rf $(MODLIB)/$(install-dir)
$(Q)mkdir -p $(MODLIB)/$(install-dir)
@@ -1133,13 +1133,13 @@ quiet_cmd_depmod = DEPMOD $(KERNELRELEA
$(KERNELRELEASE); \
fi

-.PHONY: _emodinst_post
+PHONY += _emodinst_post
_emodinst_post: _emodinst_
$(call cmd,depmod)

clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))

-.PHONY: $(clean-dirs) clean
+PHONY += $(clean-dirs) clean
$(clean-dirs):
$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

@@ -1161,7 +1161,7 @@ help:
@echo ''

# Dummies...
-.PHONY: prepare scripts
+PHONY += prepare scripts
prepare: ;
scripts: ;
endif # KBUILD_EXTMOD
@@ -1274,7 +1274,7 @@ namespacecheck:
endif #ifeq ($(config-targets),1)
endif #ifeq ($(mixed-targets),1)

-.PHONY: checkstack
+PHONY += checkstack
checkstack:
$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
$(PERL) $(src)/scripts/checkstack.pl $(ARCH)
@@ -1357,4 +1357,10 @@ clean := -f $(if $(KBUILD_SRC),$(srctree

endif # skip-makefile

+PHONY += FORCE
FORCE:
+
+
+# Declare the contents of the .PHONY variable as phony. We keep that
+# information in a variable se we can use it in if_changed and friends.
+.PHONY: $(PHONY)
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index fbfc14a..585d334 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -1,6 +1,9 @@
#
# arch/arm/Makefile
#
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies.
+#
# This file is subject to the terms and conditions of the GNU General Public
# License. See the file "COPYING" in the main directory of this archive
# for more details.
@@ -176,7 +179,7 @@ endif

archprepare: maketools

-.PHONY: maketools FORCE
+PHONY += maketools FORCE
maketools: include/linux/version.h include/asm-arm/.arch FORCE
$(Q)$(MAKE) $(build)=arch/arm/tools include/asm-arm/mach-types.h

diff --git a/arch/arm/boot/Makefile b/arch/arm/boot/Makefile
index a174d63..ec9c400 100644
--- a/arch/arm/boot/Makefile
+++ b/arch/arm/boot/Makefile
@@ -1,6 +1,9 @@
#
# arch/arm/boot/Makefile
#
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies.
+#
# This file is subject to the terms and conditions of the GNU General Public
# License. See the file "COPYING" in the main directory of this archive
# for more details.
@@ -73,7 +76,7 @@ $(obj)/bootpImage: $(obj)/bootp/bootp FO
$(call if_changed,objcopy)
@echo ' Kernel: $@ is ready'

-.PHONY: initrd FORCE
+PHONY += initrd FORCE
initrd:
@test "$(INITRD_PHYS)" != "" || \
(echo This machine does not support INITRD; exit -1)
diff --git a/arch/arm/boot/bootp/Makefile b/arch/arm/boot/bootp/Makefile
index 8e8879b..c394e30 100644
--- a/arch/arm/boot/bootp/Makefile
+++ b/arch/arm/boot/bootp/Makefile
@@ -1,6 +1,9 @@
#
# linux/arch/arm/boot/bootp/Makefile
#
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies.
+#

LDFLAGS_bootp :=-p --no-undefined -X \
--defsym initrd_phys=$(INITRD_PHYS) \
@@ -21,4 +24,4 @@ $(obj)/kernel.o: arch/arm/boot/zImage FO

$(obj)/initrd.o: $(INITRD) FORCE

-.PHONY: $(INITRD) FORCE
+PHONY += $(INITRD) FORCE
diff --git a/arch/arm26/Makefile b/arch/arm26/Makefile
index 844a9e4..fe91eda 100644
--- a/arch/arm26/Makefile
+++ b/arch/arm26/Makefile
@@ -1,6 +1,9 @@
#
# arch/arm26/Makefile
#
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies.
+#
# This file is subject to the terms and conditions of the GNU General Public
# License. See the file "COPYING" in the main directory of this archive
# for more details.
@@ -49,9 +52,9 @@ all: zImage

boot := arch/arm26/boot

-.PHONY: maketools FORCE
+PHONY += maketools FORCE
maketools: FORCE
-
+

# Convert bzImage to zImage
bzImage: vmlinux
diff --git a/arch/arm26/boot/Makefile b/arch/arm26/boot/Makefile
index b5c2277..68acb7b 100644
--- a/arch/arm26/boot/Makefile
+++ b/arch/arm26/boot/Makefile
@@ -1,6 +1,9 @@
#
# arch/arm26/boot/Makefile
#
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies.
+#
# This file is subject to the terms and conditions of the GNU General Public
# License. See the file "COPYING" in the main directory of this archive
# for more details.
@@ -60,7 +63,7 @@ $(obj)/xipImage: vmlinux FORCE
@echo ' Kernel: $@ is ready'
endif

-.PHONY: initrd
+PHONY += initrd
initrd:
@test "$(INITRD_PHYS)" != "" || \
(echo This machine does not support INITRD; exit -1)
diff --git a/arch/i386/Makefile b/arch/i386/Makefile
index 36bef65..ff6973a 100644
--- a/arch/i386/Makefile
+++ b/arch/i386/Makefile
@@ -99,8 +99,8 @@ AFLAGS += $(mflags-y)

boot := arch/i386/boot

-.PHONY: zImage bzImage compressed zlilo bzlilo \
- zdisk bzdisk fdimage fdimage144 fdimage288 install
+PHONY += zImage bzImage compressed zlilo bzlilo \
+ zdisk bzdisk fdimage fdimage144 fdimage288 install

all: bzImage

diff --git a/arch/ia64/Makefile b/arch/ia64/Makefile
index f722e1a..80ea750 100644
--- a/arch/ia64/Makefile
+++ b/arch/ia64/Makefile
@@ -1,6 +1,9 @@
#
# ia64/Makefile
#
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies.
+#
# This file is subject to the terms and conditions of the GNU General Public
# License. See the file "COPYING" in the main directory of this archive
# for more details.
@@ -62,7 +65,7 @@ drivers-$(CONFIG_OPROFILE) += arch/ia64/

boot := arch/ia64/hp/sim/boot

-.PHONY: boot compressed check
+PHONY += boot compressed check

all: compressed unwcheck

diff --git a/arch/m32r/Makefile b/arch/m32r/Makefile
index 983d438..229f66f 100644
--- a/arch/m32r/Makefile
+++ b/arch/m32r/Makefile
@@ -1,6 +1,9 @@
#
# m32r/Makefile
#
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies.
+#

LDFLAGS :=
OBJCOPYFLAGS := -O binary -R .note -R .comment -S
@@ -39,7 +42,7 @@ drivers-$(CONFIG_OPROFILE) += arch/m32r/

boot := arch/m32r/boot

-.PHONY: zImage
+PHONY += zImage

all: zImage

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 5500ab5..5787d55 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -150,7 +150,7 @@ CPPFLAGS_vmlinux.lds := -Upowerpc

BOOT_TARGETS = zImage zImage.initrd znetboot znetboot.initrd vmlinux.sm uImage

-.PHONY: $(BOOT_TARGETS)
+PHONY += $(BOOT_TARGETS)

boot := arch/$(ARCH)/boot

diff --git a/arch/ppc/Makefile b/arch/ppc/Makefile
index 98e940b..9fbdf54 100644
--- a/arch/ppc/Makefile
+++ b/arch/ppc/Makefile
@@ -82,7 +82,7 @@ drivers-$(CONFIG_OPROFILE) += arch/power

BOOT_TARGETS = zImage zImage.initrd znetboot znetboot.initrd vmlinux.sm

-.PHONY: $(BOOT_TARGETS)
+PHONY += $(BOOT_TARGETS)

all: uImage zImage

diff --git a/arch/ppc/boot/Makefile b/arch/ppc/boot/Makefile
index efd8ce5..84eec0b 100644
--- a/arch/ppc/boot/Makefile
+++ b/arch/ppc/boot/Makefile
@@ -1,6 +1,9 @@
#
# arch/ppc/boot/Makefile
#
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies.
+#
# This file is subject to the terms and conditions of the GNU General Public
# License. See the file "COPYING" in the main directory of this archive
# for more details.
@@ -25,7 +28,7 @@ subdir- += simple openfirmware

hostprogs-y := $(addprefix utils/, addnote mknote hack-coff mkprep mkbugboot mktree)

-.PHONY: $(BOOT_TARGETS) $(bootdir-y)
+PHONY += $(BOOT_TARGETS) $(bootdir-y)

$(BOOT_TARGETS): $(bootdir-y)

diff --git a/arch/ppc/boot/openfirmware/Makefile b/arch/ppc/boot/openfirmware/Makefile
index 2a411ec..66b7397 100644
--- a/arch/ppc/boot/openfirmware/Makefile
+++ b/arch/ppc/boot/openfirmware/Makefile
@@ -1,5 +1,8 @@
# Makefile for making bootable images on various OpenFirmware machines.
#
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies.
+#
# Paul Mackerras January 1997
# XCOFF bootable images for PowerMacs
# Geert Uytterhoeven September 1997
@@ -86,7 +89,7 @@ $(images)/zImage.chrp-rs6k $(images)/zIm

# The targets used on the make command-line

-.PHONY: zImage zImage.initrd
+PHONY += zImage zImage.initrd
zImage: $(images)/zImage.chrp \
$(images)/zImage.chrp-rs6k
@echo ' kernel: $@ is ready ($<)'
@@ -96,7 +99,7 @@ zImage.initrd: $(images)/zImage.initrd.

TFTPIMAGE := /tftpboot/zImage

-.PHONY: znetboot znetboot.initrd
+PHONY += znetboot znetboot.initrd
znetboot: $(images)/zImage.chrp
cp $(images)/zImage.chrp $(TFTPIMAGE).chrp$(END)
@echo ' kernel: $@ is ready ($<)'
diff --git a/arch/sh/Makefile b/arch/sh/Makefile
index 08c9515..c72e17a 100644
--- a/arch/sh/Makefile
+++ b/arch/sh/Makefile
@@ -172,7 +172,7 @@ include/asm-sh/.mach: $(wildcard include

archprepare: maketools include/asm-sh/.cpu include/asm-sh/.mach

-.PHONY: maketools FORCE
+PHONY += maketools FORCE
maketools: include/linux/version.h FORCE
$(Q)$(MAKE) $(build)=arch/sh/tools include/asm-sh/machtypes.h

diff --git a/arch/um/Makefile b/arch/um/Makefile
index c58b657..8d14c7a 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -1,4 +1,7 @@
-#
+#
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies.
+#
# Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
# Licensed under the GPL
#
@@ -88,7 +91,7 @@ CONFIG_KERNEL_HALF_GIGS ?= 0

SIZE = (($(CONFIG_NEST_LEVEL) + $(CONFIG_KERNEL_HALF_GIGS)) * 0x20000000)

-.PHONY: linux
+PHONY += linux

all: linux

diff --git a/arch/x86_64/Makefile b/arch/x86_64/Makefile
index d7fd464..7405dfd 100644
--- a/arch/x86_64/Makefile
+++ b/arch/x86_64/Makefile
@@ -67,8 +67,8 @@ drivers-$(CONFIG_OPROFILE) += arch/x86_

boot := arch/x86_64/boot

-.PHONY: bzImage bzlilo install archmrproper \
- fdimage fdimage144 fdimage288 archclean
+PHONY += bzImage bzlilo install archmrproper \
+ fdimage fdimage144 fdimage288 archclean

#Default target when executing "make"
all: bzImage
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index c3d2e4e..59620b1 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -116,16 +116,18 @@ make-cmd = $(subst \#,\\\#,$(subst $$,$$
# function to only execute the passed command if necessary
# >'< substitution is for echo to work, >$< substitution to preserve $ when reloading .cmd file
# note: when using inline perl scripts [perl -e '...$$t=1;...'] in $(cmd_xxx) double $$ your perl vars
-#
-if_changed = $(if $(strip $? $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
+#
+if_changed = $(if $(strip $(filter-out $(PHONY),$?) \
+ $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
@set -e; \
$(echo-cmd) $(cmd_$(1)); \
echo 'cmd_$@ := $(make-cmd)' > $(@D)/.$(@F).cmd)

# execute the command and also postprocess generated .d dependencies
# file
-if_changed_dep = $(if $(strip $? $(filter-out FORCE $(wildcard $^),$^)\
- $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
+if_changed_dep = $(if $(strip $(filter-out $(PHONY),$?) \
+ $(filter-out FORCE $(wildcard $^),$^) \
+ $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ), \
@set -e; \
$(echo-cmd) $(cmd_$(1)); \
scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(@D)/.$(@F).tmp; \
@@ -135,6 +137,7 @@ if_changed_dep = $(if $(strip $? $(filte
# Usage: $(call if_changed_rule,foo)
# will check if $(cmd_foo) changed, or any of the prequisites changed,
# and if so will execute $(rule_foo)
-if_changed_rule = $(if $(strip $? $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),\
+if_changed_rule = $(if $(strip $(filter-out $(PHONY),$?) \
+ $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),\
@set -e; \
$(rule_$(1)))
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 6ac96ea..7afe3e7 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -4,7 +4,7 @@

src := $(obj)

-.PHONY: __build
+PHONY := __build
__build:

# Read .config if it exist, otherwise ignore
@@ -308,14 +308,14 @@ targets += $(multi-used-y) $(multi-used-
# Descending
# ---------------------------------------------------------------------------

-.PHONY: $(subdir-ym)
+PHONY += $(subdir-ym)
$(subdir-ym):
$(Q)$(MAKE) $(build)=$@

# Add FORCE to the prequisites of a target to force it to be always rebuilt.
# ---------------------------------------------------------------------------

-.PHONY: FORCE
+PHONY += FORCE

FORCE:

@@ -330,3 +330,9 @@ cmd_files := $(wildcard $(foreach f,$(ta
ifneq ($(cmd_files),)
include $(cmd_files)
endif
+
+
+# Declare the contents of the .PHONY variable as phony. We keep that
+# information in a variable se we can use it in if_changed and friends.
+
+.PHONY: $(PHONY)
diff --git a/scripts/Makefile.clean b/scripts/Makefile.clean
index 8974ea5..cff3349 100644
--- a/scripts/Makefile.clean
+++ b/scripts/Makefile.clean
@@ -4,7 +4,7 @@

src := $(obj)

-.PHONY: __clean
+PHONY := __clean
__clean:

# Shorthand for $(Q)$(MAKE) scripts/Makefile.clean obj=dir
@@ -87,10 +87,16 @@ endif
# Descending
# ---------------------------------------------------------------------------

-.PHONY: $(subdir-ymn)
+PHONY += $(subdir-ymn)
$(subdir-ymn):
$(Q)$(MAKE) $(clean)=$@

# If quiet is set, only print short version of command

cmd = @$(if $($(quiet)cmd_$(1)),echo ' $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
+
+
+# Declare the contents of the .PHONY variable as phony. We keep that
+# information in a variable se we can use it in if_changed and friends.
+
+.PHONY: $(PHONY)
diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
index 23fd1bd..2686dd5 100644
--- a/scripts/Makefile.modinst
+++ b/scripts/Makefile.modinst
@@ -2,7 +2,7 @@
# Installing modules
# ==========================================================================

-.PHONY: __modinst
+PHONY := __modinst
__modinst:

include scripts/Kbuild.include
@@ -12,7 +12,7 @@ include scripts/Kbuild.include
__modules := $(sort $(shell grep -h '\.ko' /dev/null $(wildcard $(MODVERDIR)/*.mod)))
modules := $(patsubst %.o,%.ko,$(wildcard $(__modules:.ko=.o)))

-.PHONY: $(modules)
+PHONY += $(modules)
__modinst: $(modules)
@:

@@ -27,3 +27,9 @@ modinst_dir = $(if $(KBUILD_EXTMOD),$(ex

$(modules):
$(call cmd,modules_install,$(MODLIB)/$(modinst_dir))
+
+
+# Declare the contents of the .PHONY variable as phony. We keep that
+# information in a variable se we can use it in if_changed and friends.
+
+.PHONY: $(PHONY)
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index 563e3c5..0cfbe1c 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -32,7 +32,7 @@
# Step 4 is solely used to allow module versioning in external modules,
# where the CRC of each module is retrieved from the Module.symers file.

-.PHONY: _modpost
+PHONY := _modpost
_modpost: __modpost

include .config
@@ -60,7 +60,7 @@ quiet_cmd_modpost = MODPOST
$(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
$(filter-out FORCE,$^)

-.PHONY: __modpost
+PHONY += __modpost
__modpost: $(wildcard vmlinux) $(modules:.ko=.o) FORCE
$(call cmd,modpost)

@@ -97,7 +97,7 @@ targets += $(modules)
# Add FORCE to the prequisites of a target to force it to be always rebuilt.
# ---------------------------------------------------------------------------

-.PHONY: FORCE
+PHONY += FORCE

FORCE:

@@ -112,3 +112,9 @@ cmd_files := $(wildcard $(foreach f,$(ta
ifneq ($(cmd_files),)
include $(cmd_files)
endif
+
+
+# Declare the contents of the .PHONY variable as phony. We keep that
+# information in a variable se we can use it in if_changed and friends.
+
+.PHONY: $(PHONY)
diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index 5280945..e6499db 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -2,7 +2,7 @@
# Kernel configuration targets
# These targets are used from top-level makefile

-.PHONY: oldconfig xconfig gconfig menuconfig config silentoldconfig update-po-config
+PHONY += oldconfig xconfig gconfig menuconfig config silentoldconfig update-po-config

xconfig: $(obj)/qconf
$< arch/$(ARCH)/Kconfig
@@ -42,7 +42,7 @@ update-po-config: $(obj)/kxgettext
$(Q)rm -f arch/um/Kconfig_arch
$(Q)rm -f scripts/kconfig/linux_*.pot scripts/kconfig/config.pot

-.PHONY: randconfig allyesconfig allnoconfig allmodconfig defconfig
+PHONY += randconfig allyesconfig allnoconfig allmodconfig defconfig

randconfig: $(obj)/conf
$< -r arch/$(ARCH)/Kconfig
diff --git a/scripts/kconfig/lxdialog/Makefile b/scripts/kconfig/lxdialog/Makefile
index bbf4887..a8b0263 100644
--- a/scripts/kconfig/lxdialog/Makefile
+++ b/scripts/kconfig/lxdialog/Makefile
@@ -7,10 +7,10 @@ check-lxdialog := $(srctree)/$(src)/che
# we really need to do so. (Do not call gcc as part of make mrproper)
HOST_EXTRACFLAGS = $(shell $(CONFIG_SHELL) $(check-lxdialog) -ccflags)
HOST_LOADLIBES = $(shell $(CONFIG_SHELL) $(check-lxdialog) -ldflags $(HOSTCC))
-
-HOST_EXTRACFLAGS += -DLOCALE

-.PHONY: dochecklxdialog
+HOST_EXTRACFLAGS += -DLOCALE
+
+PHONY += dochecklxdialog
$(obj)/dochecklxdialog:
$(Q)$(CONFIG_SHELL) $(check-lxdialog) -check $(HOSTCC) $(HOST_LOADLIBES)

diff --git a/scripts/package/Makefile b/scripts/package/Makefile
index c201ef0..d3038b7 100644
--- a/scripts/package/Makefile
+++ b/scripts/package/Makefile
@@ -32,7 +32,7 @@ MKSPEC := $(srctree)/scripts/package
PREV := set -e; cd ..;

# rpm-pkg
-.PHONY: rpm-pkg rpm
+PHONY += rpm-pkg rpm

$(objtree)/kernel.spec: $(MKSPEC) $(srctree)/Makefile
$(CONFIG_SHELL) $(MKSPEC) > $@
@@ -54,10 +54,10 @@ rpm-pkg rpm: $(objtree)/kernel.spec
clean-files := $(objtree)/kernel.spec

# binrpm-pkg
-.PHONY: binrpm-pkg
+PHONY += binrpm-pkg
$(objtree)/binkernel.spec: $(MKSPEC) $(srctree)/Makefile
$(CONFIG_SHELL) $(MKSPEC) prebuilt > $@
-
+
binrpm-pkg: $(objtree)/binkernel.spec
$(MAKE) KBUILD_SRC=
set -e; \
@@ -72,7 +72,7 @@ clean-files += $(objtree)/binkernel.spec
# Deb target
# ---------------------------------------------------------------------------
#
-.PHONY: deb-pkg
+PHONY += deb-pkg
deb-pkg:
$(MAKE) KBUILD_SRC=
$(CONFIG_SHELL) $(srctree)/scripts/package/builddeb
@@ -82,7 +82,7 @@ clean-dirs += $(objtree)/debian/

# tarball targets
# ---------------------------------------------------------------------------
-.PHONY: tar%pkg
+PHONY += tar%pkg
tar%pkg:
$(MAKE) KBUILD_SRC=
$(CONFIG_SHELL) $(srctree)/scripts/package/buildtar $@
--
1.0.GIT