[bug #54675] avoid redundant recipe warning for identical recipes

[David Boyce]

URL:
  <https://savannah.gnu.org/bugs/?54675>

                 Summary: avoid redundant recipe warning for identical recipes
                 Project: make
            Submitted by: boyski
            Submitted on: Tue 18 Sep 2018 01:23:09 AM UTC
                Severity: 3 - Normal
              Item Group: Enhancement
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: SCM
        Operating System: None
           Fixed Release: None
           Triage Status: None

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Details:

I'm wondering whether it might be reasonable to skip the redundant-recipe
warnings if the recipes are identical anyway. Test case:

% cat makefile
.PHONY: all
all:
foo:; touch $@
foo:; touch $@

% make
makefile:5: warning: overriding recipe for target 'foo'
makefile:4: warning: ignoring old recipe for target 'foo'
make: Nothing to be done for 'all'.

It looks like this might be avoidable with a strcmp in read.c around line 2113
(in current SCM) though I'm not in a position to try it now.

This comes up because I have various macros and helper makefiles which
generate rules to create directory paths. The recipe to create a directory
will in all cases be "mkdir $@" in my use case but when multiple macros end up
generating identical rules these spurious warnings are still printed. Of
course it can be programmed around but I wonder whether it's worth giving the
warning at all here.






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