From owner-freebsd-current  Fri Apr  9  0: 3: 5 1999
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Date: Fri, 9 Apr 1999 17:00:59 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199904090700.RAA26586@godzilla.zeta.org.au>
To: bde@zeta.org.au, green@unixhelp.org
Subject: Re: /sys/boot, egcs vs. gcc, -Os
Cc: current@FreeBSD.ORG, jdp@polstra.com
Sender: owner-freebsd-current@FreeBSD.ORG
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>> "CC+=-Os" in individual Makefiles works about as well as "CFLAGS+=-Os" for
>> adding flags.  That's not very well.  Removing unwanted additions is hard.

>Why don't we have a -= operator in make(1)?

Substitution can replace -= in may cases, e.g.:

CC:=	${CC:S/-Os//}

This is "hard" because it has to be coded in the makefile, while additions
can be passed to make.

Bruce


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