[src/trunk]: src/usr.bin/make Since we are avoiding VAR_INTERNAL, allow the v...

[sjg <sjg%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d65913b2ba7f
branches:  trunk
changeset: 821336:d65913b2ba7f
user:      sjg <sjg%NetBSD.org@localhost>
date:      Wed Feb 01 18:39:27 2017 +0000

description:
Since we are avoiding VAR_INTERNAL, allow the variable :_ stores to
to be specified, also allows for multiple stages of modification to
be stashed.

diffstat:

 usr.bin/make/make.1 |  16 +++++++---------
 usr.bin/make/var.c  |  27 ++++++++++++++++++++-------
 2 files changed, 27 insertions(+), 16 deletions(-)

diffs (103 lines):

diff -r 717a9088cbc9 -r d65913b2ba7f usr.bin/make/make.1
--- a/usr.bin/make/make.1       Wed Feb 01 18:24:22 2017 +0000
+++ b/usr.bin/make/make.1       Wed Feb 01 18:39:27 2017 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: make.1,v 1.265 2017/01/30 02:46:20 sjg Exp $
+.\"    $NetBSD: make.1,v 1.266 2017/02/01 18:39:27 sjg Exp $
 .\"
 .\" Copyright (c) 1990, 1993
 .\"    The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"    from: @(#)make.1        8.4 (Berkeley) 3/19/94
 .\"
-.Dd January 29, 2017
+.Dd February 1, 2017
 .Dt MAKE 1
 .Os
 .Sh NAME
@@ -1425,24 +1425,22 @@
 .Pp
 However a single character variable is often more readable:
 .Dl ${MAKE_PRINT_VAR_ON_ERROR:@v@$v='${$v}'${.newline}@}
-.It Cm \&:_
+.It Cm \&:_[=var]
 Save the current variable value in
 .Ql $_
+or the named
+.Va var
 for later reference.
-This
-.Ql $_
-is internal to the variable modifier processing and
-will not conflict with any set in a makefile.
 Example usage:
 .Bd -literal -offset indent
-M_cmpv.units = 1 100 10000
+M_cmpv.units = 1 1000 1000000
 M_cmpv = S,., ,g:_:range:@i@+ $${_:[-$$i]} \&\\
 \\* $${M_cmpv.units:[$$i]}@:S,^,expr 0 ,1:sh
 
 .Dv .if ${VERSION:${M_cmpv}} < ${3.1.12:L:${M_cmpv}}
 
 .Ed
-Here the 
+Here
 .Ql $_
 is used to save the result of the
 .Ql :S
diff -r 717a9088cbc9 -r d65913b2ba7f usr.bin/make/var.c
--- a/usr.bin/make/var.c        Wed Feb 01 18:24:22 2017 +0000
+++ b/usr.bin/make/var.c        Wed Feb 01 18:39:27 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: var.c,v 1.212 2017/02/01 18:00:14 sjg Exp $    */
+/*     $NetBSD: var.c,v 1.213 2017/02/01 18:39:27 sjg Exp $    */
 
 /*
  * Copyright (c) 1988, 1989, 1990, 1993
@@ -69,14 +69,14 @@
  */
 
 #ifndef MAKE_NATIVE
-static char rcsid[] = "$NetBSD: var.c,v 1.212 2017/02/01 18:00:14 sjg Exp $";
+static char rcsid[] = "$NetBSD: var.c,v 1.213 2017/02/01 18:39:27 sjg Exp $";
 #else
 #include <sys/cdefs.h>
 #ifndef lint
 #if 0
 static char sccsid[] = "@(#)var.c      8.3 (Berkeley) 3/19/94";
 #else
-__RCSID("$NetBSD: var.c,v 1.212 2017/02/01 18:00:14 sjg Exp $");
+__RCSID("$NetBSD: var.c,v 1.213 2017/02/01 18:39:27 sjg Exp $");
 #endif
 #endif /* not lint */
 #endif
@@ -2742,11 +2742,24 @@
                break;
            }
        case '_':                       /* remember current value */
-           if CHARMOD_MATCH(tstr[1]) {
-               Var_Set("_", nstr, ctxt, 0);
+           cp = tstr + 1;      /* make sure it is set */
+           if (STRMOD_MATCHX(tstr, "_", 1)) {
+               if (tstr[1] == '=') {
+                   char *np;
+                   int n;
+
+                   cp++;
+                   n = strcspn(cp, ":)}");
+                   np = bmake_strndup(cp, n+1);
+                   np[n] = '\0';
+                   cp = tstr + 2 + n;
+                   Var_Set(np, nstr, ctxt, 0);
+                   free(np);
+               } else {
+                   Var_Set("_", nstr, ctxt, 0);
+               }
                newStr = nstr;
-               cp = ++tstr;
-               termc = *tstr;
+               termc = *cp;
                break;
            }
            goto default_case;