imx51 make clean

build/core/envsetup.mk

root下的Makefile
include build/core/main.mk
會展開main.mk位於build/core

build/core/main.mk
內有clean

下make clean 就會呼叫到這裡


.PHONY: clean
dirs_to_clean := \
        $(PRODUCT_OUT) \
        $(TARGET_COMMON_OUT_ROOT) \
        $(HOST_OUT) \
        $(HOST_COMMON_OUT_ROOT)
clean:
        @for dir in $(dirs_to_clean) ; do \
            echo "Cleaning $$dir..."; \
            rm -rf $$dir; \
        done
        @echo "Clean."; \

所以要知道會刪除哪些資料就要知道這些參數的定義

        $(PRODUCT_OUT) 

        $(TARGET_COMMON_OUT_ROOT) 

        $(HOST_OUT) 

        $(HOST_COMMON_OUT_ROOT)

可以從envsetup.mk知道

以下是結果

TARGET_COMMON_OUT_ROOT = out/target/common

PRODUCT_OUT := $(TARGET_PRODUCT_OUT_ROOT)/$(TARGET_DEVICE)  = out/target/product/imx51_bbg

HOST_OUT = out/host/linux-x86

HOST_COMMON_OUT_ROOT = out/host/common

怎麼知道envsetup.mk有跟main.mk有關系呢

main.mk會include config.mk

./main.mk:55:include $(BUILD_SYSTEM)/config.mk

config.mk會include envsetup.mk

./config.mk:122:include $(BUILD_SYSTEM)/envsetup.mk

而BUILD_SYSTEM就是build/core