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authorMasahiro Yamada <yamada.masahiro@socionext.com>2017-08-20 09:04:11 +0300
committerMasahiro Yamada <yamada.masahiro@socionext.com>2017-09-01 02:50:32 +0300
commit8e9b466799230bc20a029579e92d4cd526e5a2e1 (patch)
tree3b51d498c991f1e22bf482c0e59e0c2d203faac4
parentaae4e7a8bc44722fe70d58920a36916b1043195e (diff)
downloadlinux-8e9b466799230bc20a029579e92d4cd526e5a2e1.tar.xz
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 37d69ee30808 ("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 $(realpath ...) returns an empty string if the given path does not exist. It is convenient in places where we need to error-out if the makefile fails to create an output directory. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Thierry Reding <treding@nvidia.com>
-rw-r--r--Makefile12
-rw-r--r--scripts/gdb/linux/Makefile2
-rw-r--r--tools/power/cpupower/Makefile2
-rw-r--r--tools/scripts/Makefile.include6
4 files changed, 11 insertions, 11 deletions
diff --git a/Makefile b/Makefile
index 6eba23bcb5ad..eca6cffa3cd7 100644
--- a/Makefile
+++ b/Makefile
@@ -130,8 +130,8 @@ endif
ifneq ($(KBUILD_OUTPUT),)
# check that the output directory actually exists
saved-output := $(KBUILD_OUTPUT)
-KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
- && /bin/pwd)
+$(shell [ -d $(KBUILD_OUTPUT) ] || mkdir -p $(KBUILD_OUTPUT))
+KBUILD_OUTPUT := $(realpath $(KBUILD_OUTPUT))
$(if $(KBUILD_OUTPUT),, \
$(error failed to create output directory "$(saved-output)"))
@@ -978,7 +978,7 @@ ifdef CONFIG_HEADERS_CHECK
$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
endif
ifdef CONFIG_GDB_SCRIPTS
- $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
+ $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
endif
ifdef CONFIG_TRIM_UNUSED_KSYMS
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
@@ -1237,7 +1237,7 @@ _modinst_:
@rm -rf $(MODLIB)/kernel
@rm -f $(MODLIB)/source
@mkdir -p $(MODLIB)/kernel
- @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
+ @ln -s $(abspath $(srctree)) $(MODLIB)/source
@if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
rm -f $(MODLIB)/build ; \
ln -s $(CURDIR) $(MODLIB)/build ; \
@@ -1629,11 +1629,11 @@ image_name:
# Clear a bunch of variables before executing the submake
tools/: FORCE
$(Q)mkdir -p $(objtree)/tools
- $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
+ $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
tools/%: FORCE
$(Q)mkdir -p $(objtree)/tools
- $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
+ $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
# Single targets
# ---------------------------------------------------------------------------
diff --git a/scripts/gdb/linux/Makefile b/scripts/gdb/linux/Makefile
index 8b00031f5349..ab3cfe727a4e 100644
--- a/scripts/gdb/linux/Makefile
+++ b/scripts/gdb/linux/Makefile
@@ -1,6 +1,6 @@
always := gdb-scripts
-SRCTREE := $(shell cd $(srctree) && /bin/pwd)
+SRCTREE := $(abspath $(srctree))
$(obj)/gdb-scripts:
ifneq ($(KBUILD_SRC),)
diff --git a/tools/power/cpupower/Makefile b/tools/power/cpupower/Makefile
index d6e1c02ddcfe..4c5a481a850c 100644
--- a/tools/power/cpupower/Makefile
+++ b/tools/power/cpupower/Makefile
@@ -26,7 +26,7 @@ endif
ifneq ($(OUTPUT),)
# check that the output directory actually exists
-OUTDIR := $(shell cd $(OUTPUT) && /bin/pwd)
+OUTDIR := $(realpath $(OUTPUT))
$(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
endif
diff --git a/tools/scripts/Makefile.include b/tools/scripts/Makefile.include
index ccad8ce925e4..57a850978cef 100644
--- a/tools/scripts/Makefile.include
+++ b/tools/scripts/Makefile.include
@@ -1,7 +1,7 @@
ifneq ($(O),)
ifeq ($(origin O), command line)
- dummy := $(if $(shell test -d $(O) || echo $(O)),$(error O=$(O) does not exist),)
- ABSOLUTE_O := $(shell cd $(O) ; pwd)
+ ABSOLUTE_O := $(realpath $(O))
+ dummy := $(if $(ABSOLUTE_O),,$(error O=$(O) does not exist))
OUTPUT := $(ABSOLUTE_O)/$(if $(subdir),$(subdir)/)
COMMAND_O := O=$(ABSOLUTE_O)
ifeq ($(objtree),)
@@ -12,7 +12,7 @@ endif
# check that the output directory actually exists
ifneq ($(OUTPUT),)
-OUTDIR := $(shell cd $(OUTPUT) && /bin/pwd)
+OUTDIR := $(realpath $(OUTPUT))
$(if $(OUTDIR),, $(error output directory "$(OUTPUT)" does not exist))
endif