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[bug #63429] Escape sequence in logs are lost with -O option

From: Paul D. Smith
Subject: [bug #63429] Escape sequence in logs are lost with -O option
Date: Sun, 27 Nov 2022 09:21:15 -0500 (EST)

Update of bug #63429 (project make):

                  Status:                    None => Not A Bug              
             Open/Closed:                    Open => Closed                 


Follow-up Comment #1:

There is no way to avoid this.  In order for output sync to ensure output is
not jumbled, it has to save the output to a file and print it later.  Tools
like grep, etc. choose color or not color output by looking to see whether the
output device is a terminal or not.  This is so that if you use something like
*grep foo | sed ...* etc. you won't see all the control characters.

When make redirects the output of the command to a file, grep sees that it is
no longer writing to a terminal and so disables color mode.

GNU make will set the environment variable MAKE_TERMOUT if the command it's
running will _eventually_ be written to a terminal.  It would be possible for
tools like grep etc. to check that variable and, if it's set, behave the same
as if it was writing to a terminal.  But that would require enhancement to

The only possible way to solve this in GNU make would be to create a pty for
each command but that is extremely complicated and non-portable.


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