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opt-debug-jobs.mk revision 1.6 
      1 # $NetBSD: opt-debug-jobs.mk,v 1.6 2023/11/19 21:47:52 rillig Exp $
      2 #
      3 # Tests for the -dj command line option, which adds debug logging about
      4 # running jobs in multiple shells.
      5 
      6 .MAKEFLAGS: -dj
      7 
      8 # Run in parallel mode since the debug logging is more interesting there
      9 # than in compat mode.
     10 .MAKEFLAGS: -j1
     11 
     12 all:
     13 	# Only the actual command is logged.
     14 	# To see the evaluation of the expressions, use -dv.
     15 	: ${:Uexpanded} expression
     16 
     17 	# Undefined variables expand to empty strings.
     18 	# Multiple spaces are preserved in the command, as they might be
     19 	# significant.
     20 	: ${UNDEF} variable
     21 
     22 	# In the debug output, single quotes are not escaped, even though
     23 	# the whole command is enclosed in single quotes as well.
     24 	# This allows to copy and paste the whole command, without having
     25 	# to unescape anything.
     26 	: 'single' and "double" quotes
     27 
     28 	# Avoid a race condition in the debug output.  Without sleeping,
     29 	# it is not guaranteed that the two lines "exited/stopped" and
     30 	# "JobFinish" are output earlier than the stdout of the actual shell
     31 	# commands.  The '@' prefix avoids that this final command gets into
     32 	# another race condition with the "exited/stopped" line.
     33 	@sleep 1
     34