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job-output-long-lines.mk revision 1.2 
      1 # $NetBSD: job-output-long-lines.mk,v 1.2 2020/09/29 18:16:24 rillig Exp $
      2 #
      3 # The jobs may produce long lines of output.  A practical case are the echoed
      4 # command lines from compiler invocations, with their many -D options.
      5 #
      6 # Each of these lines must be written atomically to the actual output.
      7 # The markers for switching jobs must always be written at the beginning of
      8 # the line, to make them clearly visible in large log files.
      9 # 
     10 # As of 2020-09-27, the default job buffer size is 1024.  When a job produces
     11 # output lines that are longer than this buffer size, these output pieces are
     12 # not terminated by a newline.  Because of this missing newline, the job
     13 # markers "--- job-a ---" and "--- job-b ---" are not always written at the
     14 # beginning of a line, even though this is expected by anyone reading the log
     15 # files.
     16 
     17 .MAKEFLAGS: -j2
     18 
     19 100:=	${:U1:S,1,2222222222,g:S,2,3333333333,g}
     20 10000:=	${100:S,3,4444444444,g:S,4,xxxxxxxxxx,g}
     21 
     22 all: job-a job-b
     23 
     24 job-a:
     25 .for i in ${:U:range=100}
     26 	@echo ${10000:S,x,a,g}
     27 .endfor
     28 
     29 job-b:
     30 .for i in ${:U:range=100}
     31 	@echo ${10000:S,x,b,g}
     32 .endfor
     33