(make.info.gz) Variables in Recipes

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 5.1.2 Using Variables in Recipes
 --------------------------------
 
 The other way in which `make' processes recipes is by expanding any
 variable references in them ( Basics of Variable References
 Reference.).  This occurs after make has finished reading all the
 makefiles and the target is determined to be out of date; so, the
 recipes for targets which are not rebuilt are never expanded.
 
    Variable and function references in recipes have identical syntax and
 semantics to references elsewhere in the makefile.  They also have the
 same quoting rules: if you want a dollar sign to appear in your recipe,
 you must double it (`$$').  For shells like the default shell, that use
 dollar signs to introduce variables, it's important to keep clear in
 your mind whether the variable you want to reference is a `make'
 variable (use a single dollar sign) or a shell variable (use two dollar
 signs).  For example:
 
      LIST = one two three
      all:
              for i in $(LIST); do \
                  echo $$i; \
              done
 
 results in the following command being passed to the shell:
 
      for i in one two three; do \
          echo $i; \
      done
 
 which generates the expected result:
 
      one
      two
      three
 

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