title: why not use command 'CFLAGS += -fno-stack-protector' directly?
body: <pre><code>CFLAGS  := -fno-builtin -Wall -g -m32 -mno-sse -nostdinc $(DEFS)
  CFLAGS  += $(shell $(CC) -fno-stack-protector -E -x c /dev/null &gt;/dev/null 2&gt;&amp;1 &amp;&amp; echo -fno-stack-protector)
  
  </code></pre>
  
  <p>In the second line,i confuse  why not use command <code>CFLAGS += -fno-stack-protector</code> directly?</p>