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[bug #9060] --warn-undefined-variables


From: Mietek Bak
Subject: [bug #9060] --warn-undefined-variables
Date: Sun, 14 Sep 2014 08:39:52 +0000
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_4) AppleWebKit/537.78.2 (KHTML, like Gecko) Version/7.0.6 Safari/537.78.2

Follow-up Comment #3, bug #9060 (project make):

Specifying MAKEFLAGS += --warn-undefined-variables within a Makefile is not
equivalent to specifying the same option on the command-line.

Test case:

MAKEFLAGS += --warn-undefined-variables
$(foo):
        @echo foo
bar:
        @echo $(bar)

This bug has a long history of confusing users:
http://lists.gnu.org/archive/html/bug-make/2002-08/msg00063.html
http://lists.gnu.org/archive/html/bug-make/2003-04/msg00015.html
http://lists.gnu.org/archive/html/help-make/2011-06/msg00027.html
http://lists.gnu.org/archive/html/help-make/2013-01/msg00015.html


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