Cumulative Dependencies

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Dependencies are cumulative in a description block if a target is repeated.

This... ...is evaluated as this 
bounce.exe : jump.obj
bounce.exe : up.obj
   echo Building
bounce.exe...
 
bounce.exe : jump.obj
up.obj
   echo Building
bounce.exe...

Multiple targets in multiple dependency lines in a single description block are evaluated as if each were specified in a separate description block, but targets that are not in the last dependency line do not use the commands block.

This... ...is evaluated as this 
bounce.exe leap.exe :
jump.obj
bounce.exe climb.exe :
up.obj
   echo Building...
 
bounce.exe : jump.obj
up.obj
   echo Building
bounce.exe...
climb.exe : up.obj
   echo Building
climb.exe...
leap.exe : jump.obj
# invokes an inference rule
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