make -j max_jobs

To: tech-toolchain%netbsd.org@localhost
Subject: make -j max_jobs
From: "Simon J. Gerraty" <sjg%crufty.net@localhost>
Date: 2010年4月21日 22:06:00 -0700 (PDT)

If you run make with -j8 etc,
"-j" and "8" are placed in .MAKEFLAGS as two separate words.
So to get max_jobs you need something like:
_NJOBS := ${.MAKEFLAGS:C,.*-j *([1-9][0-9]*).*,1,円W}
would it be more useful to set say .MAKE.JOBS or .MAKE.MAX_JOBS to the
actual arg value as in:
Index: main.c
===================================================================
RCS file: /cvsroot/src/usr.bin/make/main.c,v
retrieving revision 1.179
diff -u -p -r1.179 main.c
--- main.c 20 Apr 2010 17:18:08 -0000 1.179
+++ main.c 22 Apr 2010 05:05:01 -0000
@@ -385,6 +385,7 @@ rearg: 
 case 'B':
 compatMake = TRUE;
 Var_Append(MAKEFLAGS, "-B", VAR_GLOBAL);
+ Var_Set(MAKE_MODE, "compat", VAR_GLOBAL, 0);
 break;
 case 'C':
 if (chdir(argvalue) == -1) {
@@ -500,6 +501,7 @@ rearg: 
 }
 Var_Append(MAKEFLAGS, "-j", VAR_GLOBAL);
 Var_Append(MAKEFLAGS, argvalue, VAR_GLOBAL);
+ Var_Set(".MAKE.JOBS", argvalue, VAR_GLOBAL, 0);
 maxJobTokens = maxJobs;
 break;
 case 'k':

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