(make.info.gz) Variables in Commands

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 5.1.2 Using Variables in Commands
 ---------------------------------
 
 The other way in which `make' processes commands 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 makefiles and the target is determined to be out of date; so, the
 commands for targets which are not rebuilt are never expanded.
 
    Variable and function references in commands 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
 command, 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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