gemini: image: fix race condition when building copy-kernel.bin

[openwrt/openwrt.git] / target / linux / gemini / image / copy-kernel / Makefile

diff --git a/target/linux/gemini/image/copy-kernel/Makefile b/target/linux/gemini/image/copy-kernel/Makefile
index 155c35968c688473fdc08787639b9846abe4aafd..9ba283bb01cb4bee2276806070102d74c7d3dff2 100644 (file)
--- a/target/linux/gemini/image/copy-kernel/Makefile
+++ b/target/linux/gemini/image/copy-kernel/Makefile
@@ -13,20 +13,26 @@ OBJCOPY             := $(CROSS_COMPILE)objcopy
 
 BIN_FLAGS      := -O binary -S
 
-all: copy-kernel.bin
+SRC_DIR                := $(CURDIR)/
+OUT_DIR                := $(if $(O),$(if $(patsubst %/,,$(O)),$(O)/,$(O)),$(SRC_DIR))
+
+all: $(OUT_DIR)copy-kernel.bin
 
 # Don't build dependencies, this may die if $(CC) isn't gcc
 dep:
 
 install:
 
-%.o : %.S
+$(OUT_DIR):
+       mkdir -p $(OUT_DIR)
+
+$(OUT_DIR)%.o : $(SRC_DIR)%.S | $(OUT_DIR)
        $(AS) $(ASFLAGS) -k -o $@ $<
 
-%.bin: %.o
+$(OUT_DIR)%.bin: $(OUT_DIR)%.o
        $(OBJCOPY) $(BIN_FLAGS) $< $@
 
 mrproper: clean
 
 clean:
-       rm -f copy-kernel.bin copy-kernel.o
+       rm -f $(OUT_DIR)copy-kernel.bin $(OUT_DIR)copy-kernel.o