From: Paolo 'Blaisorblade' Giarrusso Date: Thu, 5 May 2005 23:15:18 +0000 (-0700) Subject: [PATCH] uml kbuild: avoid useless rebuilds X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=776cfebb430c7b22c208b1b17add97f354d97cab;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git [PATCH] uml kbuild: avoid useless rebuilds - Fix some problems with usage of $(targets) (sometimes missing, sometimes used badly) that trigger partial rebuilds when doing a rebuild. - At that purpose, also factor out some common code for symlinks creation. - Fix a x86-64 build warning, caused by -L/usr/lib, which is anyway useless, and invalid in the x86-64 case. Tested on x86_64 and x86. Signed-off-by: Paolo 'Blaisorblade' Giarrusso Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/um/Makefile b/arch/um/Makefile index 97bca6b5ca95..6f75fb251359 100644 --- a/arch/um/Makefile +++ b/arch/um/Makefile @@ -126,7 +126,7 @@ define cmd_vmlinux__ $(CC) $(CFLAGS_vmlinux) -o $@ \ -Wl,-T,$(vmlinux-lds) $(vmlinux-init) \ -Wl,--start-group $(vmlinux-main) -Wl,--end-group \ - -L/usr/lib -lutil \ + -lutil \ $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) \ FORCE ,$^) ; rm -f linux endef diff --git a/arch/um/kernel/Makefile b/arch/um/kernel/Makefile index 246f0e7fb4cc..a9dd6933dfc3 100644 --- a/arch/um/kernel/Makefile +++ b/arch/um/kernel/Makefile @@ -4,7 +4,7 @@ # extra-y := vmlinux.lds -clean-files := vmlinux.lds.S config.tmp +clean-files := vmlinux.lds.S obj-y = checksum.o config.o exec_kern.o exitcode.o \ helper.o init_task.o irq.o irq_user.o ksyms.o main.o mem.o mem_user.o \ @@ -34,7 +34,7 @@ USER_OBJS := $(user-objs-y) config.o helper.o main.o process.o tempfile.o \ include arch/um/scripts/Makefile.rules -targets += config.c +targets := config.c config.tmp # Be careful with the below Sed code - sed is pitfall-rich! # We use sed to lower build requirements, for "embedded" builders for instance. diff --git a/arch/um/kernel/tt/Makefile b/arch/um/kernel/tt/Makefile index 3d5177df3504..c3faea21a996 100644 --- a/arch/um/kernel/tt/Makefile +++ b/arch/um/kernel/tt/Makefile @@ -4,6 +4,7 @@ # extra-y := unmap_fin.o +targets := unmap.o clean-files := unmap_tmp.o obj-y = exec_kern.o exec_user.o gdb.o ksyms.o mem.o mem_user.o process_kern.o \ diff --git a/arch/um/scripts/Makefile.rules b/arch/um/scripts/Makefile.rules index 143f6fea0763..ea3c8745fb6e 100644 --- a/arch/um/scripts/Makefile.rules +++ b/arch/um/scripts/Makefile.rules @@ -10,4 +10,18 @@ USER_OBJS := $(foreach file,$(USER_OBJS),$(obj)/$(file)) $(USER_OBJS): c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) $(CFLAGS_$(notdir $@)) quiet_cmd_make_link = SYMLINK $@ -cmd_make_link = rm -f $@; ln -sf $(srctree)/arch/$(SUBARCH)/$($(notdir $@)-dir)/$(notdir $@) $@ +cmd_make_link = ln -sf $(srctree)/arch/$(SUBARCH)/$($(notdir $@)-dir)/$(notdir $@) $@ + +# this needs to be before the foreach, because targets does not accept +# complete paths like $(obj)/$(f). To make sure this works, use a := assignment, +# or we will get $(obj)/$(f) in the "targets" value. +# Also, this forces you to use the := syntax when assigning to targets. +# Otherwise the line below will cause an infinite loop (if you don't know why, +# just do it). + +targets := $(targets) $(SYMLINKS) + +SYMLINKS := $(foreach f,$(SYMLINKS),$(obj)/$(f)) + +$(SYMLINKS): FORCE + $(call if_changed,make_link) diff --git a/arch/um/sys-i386/Makefile b/arch/um/sys-i386/Makefile index 950781e354de..fcd67c3414e4 100644 --- a/arch/um/sys-i386/Makefile +++ b/arch/um/sys-i386/Makefile @@ -7,24 +7,13 @@ obj-$(CONFIG_MODULES) += module.o USER_OBJS := bugs.o ptrace_user.o sigcontext.o fault.o -include arch/um/scripts/Makefile.rules - SYMLINKS = bitops.c semaphore.c highmem.c module.c -# this needs to be before the foreach, because clean-files does not accept -# complete paths like $(src)/$f. -clean-files := $(SYMLINKS) - -targets += $(SYMLINKS) - -SYMLINKS := $(foreach f,$(SYMLINKS),$(obj)/$f) - bitops.c-dir = lib semaphore.c-dir = kernel highmem.c-dir = mm module.c-dir = kernel -$(SYMLINKS): FORCE - $(call if_changed,make_link) - subdir- := util + +include arch/um/scripts/Makefile.rules diff --git a/arch/um/sys-x86_64/Makefile b/arch/um/sys-x86_64/Makefile index e60c9da8fb48..d6094281aa53 100644 --- a/arch/um/sys-x86_64/Makefile +++ b/arch/um/sys-x86_64/Makefile @@ -19,14 +19,6 @@ include arch/um/scripts/Makefile.rules SYMLINKS = bitops.c csum-copy.S csum-partial.c csum-wrappers.c memcpy.S \ semaphore.c thunk.S module.c -# this needs to be before the foreach, because clean-files does not accept -# complete paths like $(src)/$f. -clean-files := $(SYMLINKS) - -targets += $(SYMLINKS) - -SYMLINKS := $(foreach f,$(SYMLINKS),$(obj)/$f) - bitops.c-dir = lib csum-copy.S-dir = lib csum-partial.c-dir = lib @@ -36,7 +28,4 @@ semaphore.c-dir = kernel thunk.S-dir = lib module.c-dir = kernel -$(SYMLINKS): FORCE - $(call if_changed,make_link) - CFLAGS_csum-partial.o := -Dcsum_partial=arch_csum_partial