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Re: [Qemu-devel] [PATCH] CPPFLAGS+= in Makefile.target

From: Paul Brook
Subject: Re: [Qemu-devel] [PATCH] CPPFLAGS+= in Makefile.target
Date: Fri, 25 Jan 2008 15:53:36 +0000
User-agent: KMail/1.9.7

On Friday 25 January 2008, Ian Jackson wrote:
> Paul Brook writes ("Re: [Qemu-devel] [PATCH] CPPFLAGS+= in 
> > In that case you should always provide a definition in config-host.mak.
> > Under some circumstances make may inherit initial values from elsewhere.
> What circumstances ?  CPPFLAGS+= overrides (discards) values in the
> environment as well as ones from the command line.

$ cat Makefile
FOO += World
        @echo "$(FOO)"
$ FOO=Hello make
Hello World

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