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[driver] Remove TARGET macro

After this change the default target is the first target
in the target list. This change makes easier to keep
consistency between availabe target list and default target.

--- a/config.mk

+++ b/config.mk

@@ -2,10 +2,10 @@

 VERSION = 0.1

 ## Customize below to fit your system

-# TARGET is defined by backend-arch-abi-sys

+# TARGETS is defined by a list of backend-arch-abi-sys. First

+# element of the list becomes the default target

-TARGETS = z80-scc-dos-com \

-          amd64-sysv-linux-elf \

+TARGETS = amd64-sysv-linux-elf \

           i386-sysv-linux-elf \

           amd64-sysv-openbsd-elf

@@ -12,10 +12,8 @@

 # USEQBE selects QBE by default in the targets that support it

 USEQBE = 1

-#MKQBE enable build of 

+#MKQBE enable build of qbe backends

 MKQBE = 1

-

-TARGET  = amd64-sys-linux-elf

 DRIVER = posix

--- a/driver/posix/Makefile

+++ b/driver/posix/Makefile

@@ -17,7 +17,7 @@

 	cp scc scpp ../../rootdir/bin/

 dep:

-	PREFIX=$(PREFIX) USEQBE=$(USEQBE) ./gendep.sh $(TARGET)

+	PREFIX=$(PREFIX) USEQBE=$(USEQBE) ./gendep.sh $(TARGETS)

 $(OBJ): $(HDR)

--- a/driver/posix/gendep.sh

+++ b/driver/posix/gendep.sh

@@ -9,7 +9,7 @@

 USEQBE=${USEQBE:-1}

 echo $@ |

-(IFS=- read arch abi sys format r

+(IFS='- 	' read arch abi sys format r

 echo \#define PREFIX \"$PREFIX\"

 echo \#define USEQBE $USEQBE

 echo \#define ARCH \"$arch\"