bin/144388: different behavior of make(1) between command line argument and .MAKEFLAGS special target

[Jui-Nan Lin]

The following reply was made to PR bin/144388; it has been noted by GNATS.

From: Jui-Nan Lin <jnlin at csie.nctu.edu.tw>
To: bug-followup at FreeBSD.org, yanefbsd at gmail.com
Cc:  
Subject: Re: bin/144388: different behavior of make(1) between command line 
	argument and .MAKEFLAGS special target
Date: Mon, 1 Mar 2010 21:36:56 +0800

 Hi Garrett,
 
 Following is the result:
 
 # cat Makefile
 .MAKEFLAGS: -j1
 
 all:
         /bin/sleep 10 & \
         /bin/sleep 10 &
         @wait
 
 # time make all
 /bin/sleep 10 &  /bin/sleep 10 &
 0.000u 0.006s 0:00.01 0.0%      0+0k 0+0io 0pf+0w
 # time make -j1 all
 /bin/sleep 10 &  /bin/sleep 10 &
 0.000u 0.007s 0:10.00 0.0%      0+0k 0+0io 0pf+0w
 
 The latter version is correct because when specifying "-j", make(1)
 only forks a shell for all commands. If no "-j" specified, make forks
 1 shell for each command. You can see manpage of make(1).