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clarify how :U works

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lukem 2002-03-19 22:17:30 +00:00
parent 328fa6b19f
commit dadfca12c4
1 changed files with 7 additions and 3 deletions
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10
usr.bin/make/make.1
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@ -1,4 +1,4 @@
.\" $NetBSD: make.1,v 1.62 2002/02/08 01:36:28 ross Exp $
.\" $NetBSD: make.1,v 1.63 2002/03/19 22:17:30 lukem Exp $
.\"
.\" Copyright (c) 1990, 1993
.\" The Regents of the University of California. All rights reserved.
@ -33,7 +33,7 @@
.\"
.\" from: @(#)make.1 8.4 (Berkeley) 3/19/94
.\"
.Dd December 23, 2001
.Dd March 20, 2002
.Dt MAKE 1
.Os
.Sh NAME
@ -715,9 +715,13 @@ should start and end with a period. For example.
.It Cm U Ar newval
If the variable is undefined
.Ar newval
is the value. This is another ODE make feature. It is handy for
is the value.
If the variable is defined, the existing value is returned.
This is another ODE make feature. It is handy for
setting per-target CFLAGS for instance:
.Dl ${_${.TARGET:T}_CFLAGS:U${DEF_CFLAGS}}
If a value is only required if the variable is undefined, use:
.Dl ${VAR:D:Unewval}
.It Cm D Ar newval
If the variable is defined
.Ar newval