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.SILENT: clobbered by .SILENT: with_target

From: Britton Kerin
Subject: .SILENT: clobbered by .SILENT: with_target
Date: Tue, 11 Jan 2022 11:49:12 -0900

.SILENT: (without prerequisites) doesn't work as expected when
.SILENT: some_target (with prerequisites) is present:

     $ cat Makefile

     .SILENT: target_a
             echo target_a_recipe

             echo target_b_recipe
     $ make target_b
     echo target_b_recipe

It looks like the .SILENT: with a recipe clobbers the .SILENT:
without, which is at best undocumented spooky action-at-a-distance wrt
target_b behavior.  Reversing the order of the two .SILENT:
declarations gives the same behavior.  I think what should happen is
the global .SILENT: (with no prerequisites) wins.  Whether other
.SILENT: with_targets in the same run should then result in an error
or warning is debatable.  I guess this could be a breaking change but
the present behavior seems clearly buggy.  Is there a strategy for
incrementally changing this sort of thing?


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