Re: VPATH and prerequisites

[Paul D. Smith]

%% Joost Leeuwesteijn <address@hidden> writes:

  jl> You can check if make is run from the root directory by including a 
  jl> first/default rule in the dir1 makefile that stops the build. Something 
  jl> like:
  jl> ----------------------------------------
  jl> .PHONY : dir1_default_rule
  jl> dir1_default_rule :
  jl>       echo "ERROR: only run the toplevel makefile"
  jl>       <not sure what's the best way to bail out (exit 1?, $$(error ...)>

  jl> and/or check on a variable that must be set by the toplevel makefile and 
  jl> call $(error ...)
  jl> ----------------------------------------

You could instead check the MAKELEVEL variable to see whether this is
the top-level make, or a recursive invocation.

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 Paul D. Smith <address@hidden>          Find some GNU make tips at:
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