From 8e9b466799230bc20a029579e92d4cd526e5a2e1 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Sun, 20 Aug 2017 15:04:11 +0900 Subject: 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 $(realpath ...) returns an empty string if the given path does not exist. It is convenient in places where we need to error-out if the makefile fails to create an output directory. Signed-off-by: Masahiro Yamada Acked-by: Thierry Reding --- tools/power/cpupower/Makefile | 2 +- tools/scripts/Makefile.include | 6 +++--- 2 files changed, 4 insertions(+), 4 deletions(-) (limited to 'tools') diff --git a/tools/power/cpupower/Makefile b/tools/power/cpupower/Makefile index d6e1c02ddcfe..4c5a481a850c 100644 --- a/tools/power/cpupower/Makefile +++ b/tools/power/cpupower/Makefile @@ -26,7 +26,7 @@ endif ifneq ($(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 -- cgit v1.2.3-58-ga151