[Haskell-beginners] Warning: Tab Character

[Dan Stromberg]

I believe the first version of make required tabs, but some subsequent
versions have relaxed that requirement to make things easier.

Here's an example on a Linux Mint system (the 20's are of course spaces) :
$ od -cx < Makefile
cmd output started 2015 Sat Nov 21 04:39:47 PM PST
0000000  \n   g   o   :  \n                   .   /   t  \n  \n
           670a    3a6f    200a    2020    2e20    742f    0a0a
0000016
above cmd output done    2015 Sat Nov 21 04:39:47 PM PST
dstromberg at dell-inspiron:/var/tmp/make-tabs i686-pc-linux-gnu 25234

$ make
cmd output started 2015 Sat Nov 21 04:39:48 PM PST
Makefile:3: *** missing separator.  Stop.
above cmd output done    2015 Sat Nov 21 04:39:48 PM PST
dstromberg at dell-inspiron:/var/tmp/make-tabs i686-pc-linux-gnu 25234

$ make --version
cmd output started 2015 Sat Nov 21 04:39:53 PM PST
GNU Make 3.81
Copyright (C) 2006  Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.

This program built for i686-pc-linux-gnu
above cmd output done    2015 Sat Nov 21 04:39:53 PM PST
dstromberg at dell-inspiron:/var/tmp/make-tabs i686-pc-linux-gnu 25234


I'll add that vim's Makefile syntax highlighting puts the space-indented
line in red, suggesting an error.  Changing the spaces to a single tab
makes the red go away.

HTH

On Sat, Nov 21, 2015 at 3:34 PM, Thomas Jakway <tjakway at nyu.edu> wrote:

> Why would make require tabs...?
> Admittedly it's been a long time since I've written any makefiles by hand
> but I always use spaces instead of tabs and have never had any problems.
>
> On Nov 21, 2015 6:01 PM, David Moberg <kaddkaka at gmail.com> wrote:
> >
> > Have you found "soft tabs"? That option will make TextMate use spaces
> instead of tab characters. Read 4.11 "Using Spaces Instead of Tabs" in Dan
> Strombergs link for instrucitons.
> >
> > 2015-11-21 21:36 GMT+01:00 Jeon-Young Kang <jykang22 at gmail.com>:
> >>
> >> I've tried to choose "instead of spaces". But there is no option of
> mine (Textmate 2 beta).
> >>
> >> On Sat, Nov 21, 2015 at 3:14 PM, Dan Stromberg <strombrg at gmail.com>
> wrote:
> >>>
> >>>
> >>> Perhaps enable soft tabs?
> >>> https://manual.macromates.com/en/working_with_text
> >>>
> >>> This is an issue in Python too (at least from PEP8's perspective) -
> but note that many "make" programs require tabs instead of spaces.
> >>>
> >>> On Sat, Nov 21, 2015 at 11:13 AM, Jeon-Young Kang <jykang22 at gmail.com>
> wrote:
> >>>>
> >>>> Hello everyone.
> >>>>
> >>>>
> >>>> I am a newbie of Haskell, using Textmate on mac.
> >>>>
> >>>>
> >>>> I got the following warning. How can I fix it?
> >>>>
> >>>>
> >>>> Warning:
> >>>>
> >>>>     Tab character
> >>>>
> >>>> Ok, modules loaded: Main.
> >>>>
> >>>>
> >>>>
> >>>> Sincerely,
> >>>> Young
> >>>>
> >>>> _______________________________________________
> >>>> Beginners mailing list
> >>>> Beginners at haskell.org
> >>>> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
> >>>>
> >>>
> >>>
> >>>
> >>> --
> >>> Dan Stromberg
> >>>
> >>> _______________________________________________
> >>> Beginners mailing list
> >>> Beginners at haskell.org
> >>> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
> >>>
> >>
> >>
> >>
> >> --
> >> Department of Geography
> >> State University of New York at Buffalo
> >>
> >> jykang22 at gmail.com
> >>
> >> Jeon-Young Kang
> >>
> >> _______________________________________________
> >> Beginners mailing list
> >> Beginners at haskell.org
> >> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
> >>
> >
> _______________________________________________
> Beginners mailing list
> Beginners at haskell.org
> http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners
>



-- 
Dan Stromberg
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