My code works, I don’t know why.

國王的耳朵是驢耳朵

Makefile結合Command Line輸出結果範例

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測試大檔案支援順手玩了一下Makefile撈command line 結果，整理如下

  • $(shell command)
    • 跑command，回傳command 輸出畫面，類似command line的$(command)或是`command`
  • $(warning)
    • 顯示警告訊息，這邊是單純拿來顯示
  • ifeq字串比較記得不要亂加"

範例如下

Makefile example
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# Warning! Not sure if there is any compatilbe problem, and surely 
# not worked on cross compilation!
IS_64=$(shell file /bin/ls|grep -o 64-bit)

ifneq ($(IS_64),64-bit)
$(warning "Set -D_FILE_OFFSET_BITS=64")
CFLAGS+=-D_FILE_OFFSET_BITS=64
endif

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