[cfe-users] Why doesn't clang use colors for diagnostics by default?

[Victor via cfe-users]

> Did you build clang?
Yes

> Do you have terminfo installed?
$ find /usr/share/terminfo -type f
/usr/share/terminfo/k/kon2
/usr/share/terminfo/k/kon
/usr/share/terminfo/k/konsole-256color
/usr/share/terminfo/k/konsole
/usr/share/terminfo/v/vs100
/usr/share/terminfo/c/cygwin
/usr/share/terminfo/c/cons25
/usr/share/terminfo/t/teraterm2.3
/usr/share/terminfo/t/teraterm
/usr/share/terminfo/g/gnome
/usr/share/terminfo/g/gnome-256color
/usr/share/terminfo/w/wsvt25
/usr/share/terminfo/w/wsvt25m
/usr/share/terminfo/n/nxterm
/usr/share/terminfo/n/nsterm
/usr/share/terminfo/m/mrxvt
/usr/share/terminfo/m/mach
/usr/share/terminfo/m/mach-bold
/usr/share/terminfo/m/mach-color
/usr/share/terminfo/m/mlterm
/usr/share/terminfo/E/Eterm-88color
/usr/share/terminfo/E/Eterm-256color
/usr/share/terminfo/E/Eterm
/usr/share/terminfo/E/Eterm-color
/usr/share/terminfo/a/aterm
/usr/share/terminfo/a/ansis
/usr/share/terminfo/a/ansi80x25
/usr/share/terminfo/p/putty-vt100
/usr/share/terminfo/p/pcansi
/usr/share/terminfo/p/putty-256color
/usr/share/terminfo/p/putty
/usr/share/terminfo/s/screen.xterm-new
/usr/share/terminfo/s/sun
/usr/share/terminfo/s/screen-16color-bce
/usr/share/terminfo/s/screen-16color-s
/usr/share/terminfo/s/screen-16color-bce-s
/usr/share/terminfo/s/sun1
/usr/share/terminfo/s/screen
/usr/share/terminfo/s/screen.rxvt
/usr/share/terminfo/s/sun2
/usr/share/terminfo/s/screen.linux
/usr/share/terminfo/s/screen-256color-bce
/usr/share/terminfo/s/screen-16color
/usr/share/terminfo/s/screen-256color-s
/usr/share/terminfo/s/screen.xterm-xfree86
/usr/share/terminfo/s/screen-256color-bce-s
/usr/share/terminfo/s/screen.teraterm
/usr/share/terminfo/s/screen-bce
/usr/share/terminfo/s/screen-s
/usr/share/terminfo/s/screen.mlterm
/usr/share/terminfo/s/screen-w
/usr/share/terminfo/s/screen.xterm-r6
/usr/share/terminfo/s/screen-256color
/usr/share/terminfo/s/screen.Eterm
/usr/share/terminfo/j/jfbterm
/usr/share/terminfo/h/hurd
/usr/share/terminfo/r/rxvt-color
/usr/share/terminfo/r/rxvt-xpm
/usr/share/terminfo/r/rxvt-unicode
/usr/share/terminfo/r/rxvt-basic
/usr/share/terminfo/r/rxvt
/usr/share/terminfo/r/rxvt-88color
/usr/share/terminfo/r/rxvt-16color
/usr/share/terminfo/r/rxvt-cygwin-native
/usr/share/terminfo/r/rxvt-256color
/usr/share/terminfo/r/rxvt-cygwin
/usr/share/terminfo/x/xterm-xf86-v32
/usr/share/terminfo/x/xterm-xi
/usr/share/terminfo/x/xterm-r5
/usr/share/terminfo/x/xterm-vt220
/usr/share/terminfo/x/xterm-new
/usr/share/terminfo/x/xterm-sun
/usr/share/terminfo/x/xterm-nic
/usr/share/terminfo/x/xterm-8bit
/usr/share/terminfo/x/xterm-old
/usr/share/terminfo/x/xterm-hp
/usr/share/terminfo/x/xterm-color
/usr/share/terminfo/x/xterm-256color
/usr/share/terminfo/x/xterm-pcolor
/usr/share/terminfo/x/xterm-basic
/usr/share/terminfo/x/xterm-noapp
/usr/share/terminfo/x/xterm-24
/usr/share/terminfo/x/xterm-bold
/usr/share/terminfo/x/xterms
/usr/share/terminfo/x/xterm
/usr/share/terminfo/x/xterm-1003
/usr/share/terminfo/x/xterm-sco
/usr/share/terminfo/x/xterm-1002
/usr/share/terminfo/x/xterm-vt52
/usr/share/terminfo/x/xterm-16color
/usr/share/terminfo/x/xterm-r6
/usr/share/terminfo/x/xterm-xf86-v44
/usr/share/terminfo/x/xfce
/usr/share/terminfo/x/xterm-xf86-v333
/usr/share/terminfo/x/xterm-88color
/usr/share/terminfo/x/xterm-xfree86
/usr/share/terminfo/x/xterm-xf86-v43
/usr/share/terminfo/x/xterm-xf86-v40
/usr/share/terminfo/x/xterm-xf86-v33
/usr/share/terminfo/e/eterm
/usr/share/terminfo/e/eterm-color
/usr/share/terminfo/A/Apple_Terminal

On Thu, 10 Sep 2015 11:53:48 -0400
  don hinton <hintonda at gmail.com> wrote:
> Did you build clang?  Do you have terminfo installed?  I 
>think that's what
> it checks.
> 
> On Thu, Sep 10, 2015 at 11:49 AM, Victor <d.v.a at ngs.ru> 
>wrote:
> 
>> No. Still no luck. Tried both
>>
>>
>> On Thu, 10 Sep 2015 11:39:24 -0400
>>  don hinton <hintonda at gmail.com> wrote:
>>
>>> Hi Victor:
>>>
>>> Try setting TERM to a color terminal, e.g., xterm-color 
>>>or xterm-256color
>>> and see if that helps.  I use xterm-256color inside tmux 
>>>and it works
>>> fine.
>>>
>>> hth...
>>> don
>>>
>>> On Thu, Sep 10, 2015 at 2:40 AM, Victor via cfe-users <
>>> cfe-users at lists.llvm.org> wrote:
>>>
>>> I'm using command like this:
>>>>
>>>> $ clang++ prg.cpp
>>>>
>>>> My Clang is built from sources. What libraries it needs 
>>>>to use colors
>>>> automatically? Or may be there is some option that I can 
>>>>specify for
>>>> configure?
>>>>
>>>>
>>>> On Wed, 9 Sep 2015 19:49:21 -0700
>>>>  Richard Trieu <rtrieu at google.com> wrote:
>>>>
>>>> Are you invoking Clang with "clang foo.cc" or "clang 
>>>>-cc1 foo.cc"?  The
>>>>> first should detect if you have a color capable terminal 
>>>>>and
>>>>> automatically
>>>>> turn on color diagnostics while the second needs the 
>>>>>flag explicitly.
>>>>> The
>>>>> other possibility is that the Clang you are using was 
>>>>>compiled with the
>>>>> libraries needed to detect a color terminal, and 
>>>>>defaults to no color.
>>>>>
>>>>> On Mon, Sep 7, 2015 at 5:15 AM, Victor via cfe-users <
>>>>> cfe-users at lists.llvm.org> wrote:
>>>>>
>>>>> Hello, all.
>>>>>
>>>>>>
>>>>>> Why doesn't clang use colors for diagnostics by default?
>>>>>> My environment:
>>>>>>
>>>>>> $ cat /etc/*-release
>>>>>> Red Hat Enterprise Linux Server release 6.3 (Santiago)
>>>>>>
>>>>>> $ echo $TERM
>>>>>> xterm
>>>>>>
>>>>>> Doc here
>>>>>> http://clang.llvm.org/docs/UsersManual.html#formatting-of-diagnostics
>>>>>> says: "This option, which defaults to on when a 
>>>>>>color-capable terminal
>>>>>> is
>>>>>> detected". Isn't xterm "a color-capable terminal"?
>>>>>>
>>>>>> If I give -fcolor-diagnostics explicitly, all works as 
>>>>>>expected. But
>>>>>> why
>>>>>> must I do that? GCC uses colors by default.
>>>>>> _______________________________________________
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>>>>>>
>>>>>>
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