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

[Masahiro Yamada]

URL:
  <https://savannah.gnu.org/bugs/?63429>

                 Summary: Escape sequence in logs are lost with -O option
                 Project: make
               Submitter: masahiroy
               Submitted: Sun 27 Nov 2022 02:32:02 AM UTC
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: None
        Operating System: None
           Fixed Release: None
           Triage Status: None


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Follow-up Comments:


-------------------------------------------------------
Date: Sun 27 Nov 2022 02:32:02 AM UTC By: Masahiro Yamada <masahiroy>
While the -O option buffering the logs, the escape sequences for colors are
lost.



[Sample Makefile]


all: test.txt
        grep --color=auto foo $<

test.txt:
        @echo foobar > $@




[Test without -O]

$ make
grep --color=auto foo test.txt
foobar


In my environment, the part "foo" is highlighted in color.




[Test with -O]
$ make -j2 -O
grep --color=auto foo test.txt
foobar


The part "foo" is not highlighted any more.




Recent compilers show warnings/errors in color, but they are lost with the -O
option.


Can we do this better?







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