make use of make variable CURDIR instead of calling pwd

make already provides the current working directory in a variable, so make
use of it instead of forking a shell. Also replace usage of PWD by
CURDIR. PWD is provided by most shells, but not all, so this makes the
build system more robust.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Michal Marek <mmarek@suse.com>

samples/bpf/Makefile

@@ -119,10 +119,10 @@ CLANG ?= clang
 
 # Trick to allow make to be run from this directory
 all:
-	$(MAKE) -C ../../ $$PWD/
+	$(MAKE) -C ../../ $(CURDIR)/
 
 clean:
-	$(MAKE) -C ../../ M=$$PWD clean
+	$(MAKE) -C ../../ M=$(CURDIR) clean
 	@rm -f *~
 
 # Verify LLVM compiler tools are available and bpf target is supported by llc

samples/connector/Makefile

@@ -13,4 +13,4 @@ HOSTCFLAGS_ucon.o += -I$(objtree)/usr/include
 all: modules
 
 modules clean:
-	$(MAKE) -C ../.. SUBDIRS=$(PWD) $@
+	$(MAKE) -C ../.. SUBDIRS=$(CURDIR) $@

tools/build/Makefile

 ifeq ($(srctree),)
-srctree := $(patsubst %/,%,$(dir $(shell pwd)))
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 endif
 

tools/gpio/Makefile

@@ -3,7 +3,7 @@ include ../scripts/Makefile.include
 bindir ?= /usr/bin
 
 ifeq ($(srctree),)
-srctree := $(patsubst %/,%,$(dir $(shell pwd)))
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 endif
 

tools/lib/api/Makefile

@@ -2,7 +2,7 @@ include ../../scripts/Makefile.include
 include ../../scripts/utilities.mak		# QUIET_CLEAN
 
 ifeq ($(srctree),)
-srctree := $(patsubst %/,%,$(dir $(shell pwd)))
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 #$(info Determined 'srctree' to be $(srctree))

tools/lib/bpf/Makefile

@@ -7,7 +7,7 @@ BPF_EXTRAVERSION = 1
 MAKEFLAGS += --no-print-directory
 
 ifeq ($(srctree),)
-srctree := $(patsubst %/,%,$(dir $(shell pwd)))
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 #$(info Determined 'srctree' to be $(srctree))

tools/lib/lockdep/Makefile

@@ -50,7 +50,7 @@ ifndef VERBOSE
 endif
 
 ifeq ($(srctree),)
-srctree := $(patsubst %/,%,$(dir $(shell pwd)))
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 #$(info Determined 'srctree' to be $(srctree))

tools/lib/subcmd/Makefile

@@ -2,7 +2,7 @@ include ../../scripts/Makefile.include
 include ../../scripts/utilities.mak		# QUIET_CLEAN
 
 ifeq ($(srctree),)
-srctree := $(patsubst %/,%,$(dir $(shell pwd)))
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 #$(info Determined 'srctree' to be $(srctree))

tools/lib/traceevent/Makefile

@@ -86,7 +86,7 @@ ifndef VERBOSE
 endif
 
 ifeq ($(srctree),)
-srctree := $(patsubst %/,%,$(dir $(shell pwd)))
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 #$(info Determined 'srctree' to be $(srctree))

tools/objtool/Makefile

@@ -11,12 +11,12 @@ LD = ld
 AR = ar
 
 ifeq ($(srctree),)
-srctree := $(patsubst %/,%,$(dir $(shell pwd)))
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 endif
 
 SUBCMD_SRCDIR		= $(srctree)/tools/lib/subcmd/
-LIBSUBCMD_OUTPUT	= $(if $(OUTPUT),$(OUTPUT),$(PWD)/)
+LIBSUBCMD_OUTPUT	= $(if $(OUTPUT),$(OUTPUT),$(CURDIR)/)
 LIBSUBCMD		= $(LIBSUBCMD_OUTPUT)libsubcmd.a
 
 OBJTOOL    := $(OUTPUT)objtool

tools/perf/Makefile.perf

@@ -94,7 +94,7 @@ LC_NUMERIC=C
 export LC_COLLATE LC_NUMERIC
 
 ifeq ($(srctree),)
-srctree := $(patsubst %/,%,$(dir $(shell pwd)))
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 #$(info Determined 'srctree' to be $(srctree))
 endif

tools/perf/tests/make

@@ -42,7 +42,7 @@ LC_NUMERIC=C
 export LC_COLLATE LC_NUMERIC
 
 ifeq ($(srctree),)
-srctree := $(patsubst %/,%,$(dir $(shell pwd)))
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 #$(info Determined 'srctree' to be $(srctree))
 endif

tools/power/cpupower/Makefile

@@ -108,9 +108,6 @@ MKDIR = mkdir
 # Now we set up the build system
 #
 
-# set up PWD so that older versions of make will work with our build.
-PWD = $(shell pwd)
-
 GMO_FILES = ${shell for HLANG in ${LANGUAGES}; do echo $(OUTPUT)po/$$HLANG.gmo; done;}
 
 export CROSS CC AR STRIP RANLIB CFLAGS LDFLAGS LIB_OBJS

tools/power/cpupower/debug/kernel/Makefile

 obj-m	:=
 
 KDIR	:= /lib/modules/$(shell uname -r)/build
-PWD		:= $(shell pwd)
 KMISC   := /lib/modules/$(shell uname -r)/cpufrequtils/
 
 ifeq ("$(CONFIG_X86_TSC)", "y")
@@ -9,7 +8,7 @@ ifeq ("$(CONFIG_X86_TSC)", "y")
 endif
 
 default:
-	$(MAKE) -C $(KDIR) M=$(PWD)
+	$(MAKE) -C $(KDIR) M=$(CURDIR)
 
 clean:
 	- rm -rf *.o *.ko .tmp-versions .*.cmd .*.mod.* *.mod.c