kbuild: change kbuild to not rely on incorrect GNU make behavior
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 $? list when determining whether
targets are up-to-date or not.
Signed-off-by: Paul Smith <psmith@gnu.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index c3d2e4e..59620b1 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -116,16 +116,18 @@
# function to only execute the passed command if necessary
# >'< substitution is for echo to work, >$< 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 @@
# 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 @@
# 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 @@
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 @@
# 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 @@
__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 @@
$(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 @@
$(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \
$(filter-out FORCE,$^)
-.PHONY: __modpost
+PHONY += __modpost
__modpost: $(wildcard vmlinux) $(modules:.ko=.o) FORCE
$(call cmd,modpost)
@@ -97,7 +97,7 @@
# Add FORCE to the prequisites of a target to force it to be always rebuilt.
# ---------------------------------------------------------------------------
-.PHONY: FORCE
+PHONY += FORCE
FORCE:
@@ -112,3 +112,9 @@
ifneq ($(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 @@
$(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 @@
# 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 c201ef00..d3038b7 100644
--- a/scripts/package/Makefile
+++ b/scripts/package/Makefile
@@ -32,7 +32,7 @@
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 @@
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 @@
# Deb target
# ---------------------------------------------------------------------------
#
-.PHONY: deb-pkg
+PHONY += deb-pkg
deb-pkg:
$(MAKE) KBUILD_SRC=
$(CONFIG_SHELL) $(srctree)/scripts/package/builddeb
@@ -82,7 +82,7 @@
# tarball targets
# ---------------------------------------------------------------------------
-.PHONY: tar%pkg
+PHONY += tar%pkg
tar%pkg:
$(MAKE) KBUILD_SRC=
$(CONFIG_SHELL) $(srctree)/scripts/package/buildtar $@
