Add support for specifying install directory with "make install DESTDIR=x"

Makefile

@@ -6,7 +6,11 @@ endif
 
 TARGETS := tools crt rpl
 
+DESTDIR ?= $(CURDIR)
+INSTALLDIR := $(shell cd ${DESTDIR} ; pwd)
+
 export WUT_ROOT
+export INSTALLDIR
 
 all:
 	@for dir in $(TARGETS); do \
@@ -26,8 +30,8 @@ clean:
 	done
 
 install:
-	@mkdir -p bin
-	@mkdir -p lib
+	@mkdir -p $(INSTALLDIR)
+	@cp -r include $(INSTALLDIR)
 	@for dir in $(TARGETS); do \
 		echo; \
 		echo Installing $$dir; \

crt/Makefile

@@ -12,8 +12,8 @@ clean:
 	@rm -f $(OFILES) $(OUTPUT).a
 
 install: all
-	@mkdir -p $(WUT_ROOT)/lib
-	@cp -f *.a $(WUT_ROOT)/lib
+	@mkdir -p $(INSTALLDIR)/lib
+	@cp -f *.a $(INSTALLDIR)/lib
 
 %.o: %.S
 	@echo "[CC]  $(notdir $<)"

rpl/Makefile

@@ -15,10 +15,10 @@ clean:
 	done
 
 install: all
-	@mkdir -p $(WUT_ROOT)/lib
+	@mkdir -p $(INSTALLDIR)/lib
 	@for dir in $(TARGETS); do \
 		echo Installing $$dir; \
-		cp $$dir/*.a $(WUT_ROOT)/lib; \
+		cp $$dir/*.a $(INSTALLDIR)/lib; \
 	done
 
 .PHONY: all install clean

tools/Makefile

@@ -18,10 +18,10 @@ else
 endif
 
 install: all
-	@mkdir -p $(WUT_ROOT)/bin
+	@mkdir -p $(INSTALLDIR)/bin
 	@for dir in $(TARGETS); do \
 		echo Installing $$dir; \
-		cp bin/$$dir $(WUT_ROOT)/bin; \
+		cp bin/$$dir $(INSTALLDIR)/bin; \
 	done
 
 else
@@ -40,10 +40,10 @@ clean:
 	done
 
 install: all
-	@mkdir -p $(WUT_ROOT)/bin
+	@mkdir -p $(INSTALLDIR)/bin
 	@for dir in $(TARGETS); do \
 		echo Installing $$dir; \
-		cp $$dir/$$dir $(WUT_ROOT)/bin; \
+		cp $$dir/$$dir $(INSTALLDIR)/bin; \
 	done
 endif