diff options
Diffstat (limited to 'usr.bin/make/make.1')
| -rw-r--r-- | usr.bin/make/make.1 | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/usr.bin/make/make.1 b/usr.bin/make/make.1 index 7e94424dad7..c17e620c66e 100644 --- a/usr.bin/make/make.1 +++ b/usr.bin/make/make.1 @@ -1,4 +1,4 @@ -.\" $OpenBSD: make.1,v 1.100 2012/10/12 21:44:19 espie Exp $ +.\" $OpenBSD: make.1,v 1.101 2013/02/04 14:44:58 espie Exp $ .\" $NetBSD: make.1,v 1.18 1997/03/10 21:19:53 christos Exp $ .\" .\" Copyright (c) 1990, 1993 @@ -30,7 +30,7 @@ .\" .\" from: @(#)make.1 8.4 (Berkeley) 3/19/94 .\" -.Dd $Mdocdate: October 12 2012 $ +.Dd $Mdocdate: February 4 2013 $ .Dt MAKE 1 .Os .Sh NAME @@ -526,6 +526,20 @@ Any whitespace before the assigned is removed; if the value is being appended, a single space is inserted between the previous contents of the variable and the appended value. .Pp +Several extended assignment operators may be combined together. +For instance, +.Bd -literal -offset indent +A ?!= cmd +.Ed +.Pp +will only run +.Qq cmd +and put its output into +.Va A +if +.Va A +is not yet defined. +.Pp Variables are expanded by surrounding the variable name with either curly braces .Pq Ql {} @@ -1542,7 +1556,7 @@ is contorted to the point of absurdity. .Pp If the same target is specified several times in complete target rules, .Nm -ignores all commands after the first non empty set of commands, +silently ignores all commands after the first non empty set of commands, e.g., in .Bd -literal -offset indent a: @@ -1601,13 +1615,6 @@ For instance, in .Pp the test will never match, even though the value is correct. .Pp -The conditional handler is incredibly lame. -Junk such as -.Pp -.Dl \&.if defined anything goes (A) -.Pp -will be accepted silently. -.Pp In a .for loop, only the variable value is used; assignments will be evaluated later, e.g., in .Bd -literal -offset indent |