[U-Boot] [PATCH] Fix variable flavor in examples/standalone/Makefile

[Che-liang Chiou]

GNU Makefile have two flavors of variables, recursively expanded that is
defined by using '=', and simply expanded that is defined by using ':='.

The bug is caused by using recursively expanded flavor for BIN and SREC.
As you can see below, they are prepended by $(obj) twice.

We can reproduce this bug with a simplified version of this Makefile:
$ cat > Makefile <<EOF
obj := /path/to/obj/
ELF := hello_world

BIN_rec = $(addsuffix .bin,$(ELF))      # recursively expanded
BIN_sim := $(addsuffix .bin,$(ELF))     # simply expanded

ELF := $(addprefix $(obj),$(ELF))
BIN_rec := $(addprefix $(obj),$(BIN_rec))
BIN_sim := $(addprefix $(obj),$(BIN_sim))

show:
    @echo BIN_rec=$(BIN_rec)
    @echo BIN_sim=$(BIN_sim)

.PHONY: show
EOF
$ make show
BIN_rec=/path/to/obj//path/to/obj/hello_world.bin
BIN_sim=/path/to/obj/hello_world.bin

Signed-off-by: Che-Liang Chiou <clchiou at chromium.org>
---

 examples/standalone/Makefile |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/examples/standalone/Makefile b/examples/standalone/Makefile
index c1dfdce..6fd9f5d 100644
--- a/examples/standalone/Makefile
+++ b/examples/standalone/Makefile
@@ -45,8 +45,8 @@ ELF-oxc                          += eepro100_eeprom
 #
 ELF := $(strip $(ELF-y) $(ELF-$(ARCH)) $(ELF-$(BOARD)) $(ELF-$(CPU)))

-SREC = $(addsuffix .srec,$(ELF))
-BIN  = $(addsuffix .bin,$(ELF))
+SREC := $(addsuffix .srec,$(ELF))
+BIN  := $(addsuffix .bin,$(ELF))

 COBJS  := $(ELF:=.o)

-- 
1.7.3.1