xref: /netbsd-current/usr.bin/make/unit-tests/job-output-long-lines.mk

# $NetBSD: job-output-long-lines.mk,v 1.2 2020/09/29 18:16:24 rillig Exp $
#
# The jobs may produce long lines of output.  A practical case are the echoed
# command lines from compiler invocations, with their many -D options.
#
# Each of these lines must be written atomically to the actual output.
# The markers for switching jobs must always be written at the beginning of
# the line, to make them clearly visible in large log files.
# 
# As of 2020-09-27, the default job buffer size is 1024.  When a job produces
# output lines that are longer than this buffer size, these output pieces are
# not terminated by a newline.  Because of this missing newline, the job
# markers "--- job-a ---" and "--- job-b ---" are not always written at the
# beginning of a line, even though this is expected by anyone reading the log
# files.

.MAKEFLAGS: -j2

100:=	${:U1:S,1,2222222222,g:S,2,3333333333,g}
10000:=	${100:S,3,4444444444,g:S,4,xxxxxxxxxx,g}

all: job-a job-b

job-a:
.for i in ${:U:range=100}
	@echo ${10000:S,x,a,g}
.endfor

job-b:
.for i in ${:U:range=100}
	@echo ${10000:S,x,b,g}
.endfor