bootconfig: Support O=<builddir> option

Support O=<builddir> option to build bootconfig tool in
the other directory. As same as other tools, if you specify
O=<builddir>, bootconfig command is build under <builddir>.

Link: http://lkml.kernel.org/r/158323468033.10560.14661631369326294355.stgit@devnote2Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

tools/bootconfig/Makefile

 # SPDX-License-Identifier: GPL-2.0
 # Makefile for bootconfig command
+include ../scripts/Makefile.include
 
 bindir ?= /usr/bin
 
-HEADER = include/linux/bootconfig.h
-CFLAGS = -Wall -g -I./include
+ifeq ($(srctree),)
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+endif
 
-PROGS = bootconfig
+LIBSRC = $(srctree)/lib/bootconfig.c $(srctree)/include/linux/bootconfig.h
+CFLAGS = -Wall -g -I$(CURDIR)/include
 
-all: $(PROGS)
+ALL_TARGETS := bootconfig
+ALL_PROGRAMS := $(patsubst %,$(OUTPUT)%,$(ALL_TARGETS))
 
-bootconfig: ../../lib/bootconfig.c main.c $(HEADER)
+all: $(ALL_PROGRAMS)
+
+$(OUTPUT)bootconfig: main.c $(LIBSRC)
 	$(CC) $(filter %.c,$^) $(CFLAGS) -o $@
 
-install: $(PROGS)
-	install bootconfig $(DESTDIR)$(bindir)
+test: $(ALL_PROGRAMS) test-bootconfig.sh
+	./test-bootconfig.sh $(OUTPUT)
 
-test: bootconfig
-	./test-bootconfig.sh
+install: $(ALL_PROGRAMS)
+	install $(OUTPUT)bootconfig $(DESTDIR)$(bindir)
 
 clean:
-	$(RM) -f *.o bootconfig
+	$(RM) -f $(OUTPUT)*.o $(ALL_PROGRAMS)

tools/bootconfig/test-bootconfig.sh

@@ -3,9 +3,16 @@
 
 echo "Boot config test script"
 
-BOOTCONF=./bootconfig
-INITRD=`mktemp initrd-XXXX`
-TEMPCONF=`mktemp temp-XXXX.bconf`
+if [ -d "$1" ]; then
+  TESTDIR=$1
+else
+  TESTDIR=.
+fi
+BOOTCONF=${TESTDIR}/bootconfig
+
+INITRD=`mktemp ${TESTDIR}/initrd-XXXX`
+TEMPCONF=`mktemp ${TESTDIR}/temp-XXXX.bconf`
+OUTFILE=`mktemp ${TESTDIR}/tempout-XXXX`
 NG=0
 
 cleanup() {
@@ -65,7 +72,6 @@ new_size=$(stat -c %s $INITRD)
 xpass test $new_size -eq $initrd_size
 
 echo "No error messge while applying"
-OUTFILE=`mktemp tempout-XXXX`
 dd if=/dev/zero of=$INITRD bs=4096 count=1
 printf " \0\0\0 \0\0\0" >> $INITRD
 $BOOTCONF -a $TEMPCONF $INITRD > $OUTFILE 2>&1