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[bug #47624] Suppress unnecessary warning for "include XXX" when we know


From: Stefan Becker
Subject: [bug #47624] Suppress unnecessary warning for "include XXX" when we know how to build XXX
Date: Tue, 05 Apr 2016 08:18:02 +0000
User-agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0

URL:
  <http://savannah.gnu.org/bugs/?47624>

                 Summary: Suppress unnecessary warning for "include XXX" when
we know how to build XXX
                 Project: make
            Submitted by: stefanb
            Submitted on: Tue 05 Apr 2016 08:18:01 AM GMT
                Severity: 3 - Normal
              Item Group: Enhancement
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 4.1
        Operating System: None
           Fixed Release: None
           Triage Status: None

    _______________________________________________________

Details:

Over the years I have seen the same useless discussion popping up again and
again, caused by an unnecessary warning generated by GNU make.

SW build user: build log shows "Makefile:NN: xyz: No such file or directory".
Please replace "include" with "-include" in the build templates to remove this
error message from the log.

SW build owner: This is a GNU make warning, not an error. "-include" cannot be
used, because it causes GNU make to ignore _real_ build errors.

Example test makefile:


.PHONY: default
default:
        @echo DONE

generated_include1:
        touch $@

include generated_include1

include generated_include2

generated_include2:
        touch $@


Test run:


$ rm -f generated_include*; /usr/bin/make -f Makefile.test 
Makefile.test:11: generated_include1: No such file or directory
Makefile.test:13: generated_include2: No such file or directory
touch generated_include2
touch generated_include1
DONE


The first warning message is unnecessary, because GNU make already knows that
it will be able to generate the file "generated_include1".

With the attached simple patch we suppress the warning for non-existing files
for which GNU make already has parsed a recipe:


$ rm -f generated_include*; ./make -f Makefile.test 
Makefile.test:13: generated_include2: No such file or directory
touch generated_include2
touch generated_include1
DONE





    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Tue 05 Apr 2016 08:18:01 AM GMT  Name: dummy.patch  Size: 906B   By:
stefanb
Patch to suppress &quot;include X&quot; warning message for X when recipe for
X is already known
<http://savannah.gnu.org/bugs/download.php?file_id=36837>

    _______________________________________________________

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  <http://savannah.gnu.org/bugs/?47624>

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