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kbuild: use $(abspath ...) instead of $(shell cd ... && /bin/pwd)
Kbuild conventionally uses $(shell cd ... && /bin/pwd) idiom to get
the absolute path of the directory because GNU Make 3.80, the minimal
supported version at that time, did not support $(abspath ...) or
$(realpath ...).
Commit 37d69ee308
("docs: bump minimal GNU Make version to 3.81")
dropped the GNU Make 3.80 support, so we are now allowed to use those
make-builtin helpers.
This conversion will provide better portability without relying on
the pwd command or its location /bin/pwd.
I am intentionally using $(realpath ...) instead $(abspath ...) in
some places. The difference between the two is $(realpath ...)
returns an empty string if the given path does not exist. It is
convenient in places where we need to error-out if the makefile fails
to create an output directory.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
parent
aae4e7a8bc
commit
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12
Makefile
12
Makefile
@ -130,8 +130,8 @@ endif
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ifneq ($(KBUILD_OUTPUT),)
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# check that the output directory actually exists
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saved-output := $(KBUILD_OUTPUT)
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KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
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&& /bin/pwd)
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$(shell [ -d $(KBUILD_OUTPUT) ] || mkdir -p $(KBUILD_OUTPUT))
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KBUILD_OUTPUT := $(realpath $(KBUILD_OUTPUT))
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$(if $(KBUILD_OUTPUT),, \
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$(error failed to create output directory "$(saved-output)"))
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@ -978,7 +978,7 @@ ifdef CONFIG_HEADERS_CHECK
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$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
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endif
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ifdef CONFIG_GDB_SCRIPTS
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$(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
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$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
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endif
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ifdef CONFIG_TRIM_UNUSED_KSYMS
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$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
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@ -1237,7 +1237,7 @@ _modinst_:
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@rm -rf $(MODLIB)/kernel
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@rm -f $(MODLIB)/source
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@mkdir -p $(MODLIB)/kernel
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@ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
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@ln -s $(abspath $(srctree)) $(MODLIB)/source
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@if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
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rm -f $(MODLIB)/build ; \
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ln -s $(CURDIR) $(MODLIB)/build ; \
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@ -1629,11 +1629,11 @@ image_name:
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# Clear a bunch of variables before executing the submake
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tools/: FORCE
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$(Q)mkdir -p $(objtree)/tools
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$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
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$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
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tools/%: FORCE
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$(Q)mkdir -p $(objtree)/tools
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$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
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$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
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# Single targets
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# ---------------------------------------------------------------------------
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@ -1,6 +1,6 @@
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always := gdb-scripts
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SRCTREE := $(shell cd $(srctree) && /bin/pwd)
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SRCTREE := $(abspath $(srctree))
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$(obj)/gdb-scripts:
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ifneq ($(KBUILD_SRC),)
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@ -26,7 +26,7 @@ endif
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ifneq ($(OUTPUT),)
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# check that the output directory actually exists
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OUTDIR := $(shell cd $(OUTPUT) && /bin/pwd)
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OUTDIR := $(realpath $(OUTPUT))
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$(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
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endif
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@ -1,7 +1,7 @@
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ifneq ($(O),)
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ifeq ($(origin O), command line)
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dummy := $(if $(shell test -d $(O) || echo $(O)),$(error O=$(O) does not exist),)
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ABSOLUTE_O := $(shell cd $(O) ; pwd)
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ABSOLUTE_O := $(realpath $(O))
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dummy := $(if $(ABSOLUTE_O),,$(error O=$(O) does not exist))
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OUTPUT := $(ABSOLUTE_O)/$(if $(subdir),$(subdir)/)
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COMMAND_O := O=$(ABSOLUTE_O)
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ifeq ($(objtree),)
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@ -12,7 +12,7 @@ endif
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# check that the output directory actually exists
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ifneq ($(OUTPUT),)
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OUTDIR := $(shell cd $(OUTPUT) && /bin/pwd)
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OUTDIR := $(realpath $(OUTPUT))
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$(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
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endif
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