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Force Rebuild if CXXFLAGS Change?

From: Jeffrey Walton
Subject: Force Rebuild if CXXFLAGS Change?
Date: Thu, 11 Aug 2011 03:27:09 -0400 
Hi All,

Is it possible to have make rebuild a target if its CXXFLAGS change?
For example:

    `make debug`   # CXXFLAGS = -D_GLIBCXX_DEBUG -DDEBUG=1 -g3 -ggdb -O0
    <user runs debug build>
    `make release`   #CXXFLAGS = -DNDEBUG=1 -g -O2
    <make: nothing to make>

Jeff
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