Bad control characters in GHCi 6.6 (Mac OS X PPC)

[Gregory Wright]

Hi Thorkil,

On Nov 21, 2006, at 2:24 PM, Thorkil Naur wrote:

> Hello,
>
> I am trying to reproduce the problem reported as "#898: GHC  
> compiles against
> Apple's readline, giving error". On my PPC Mac OS X 10.3 Panther,  
> however, I
> have managed to build ghc-6.6 without running into this particular  
> problem.
> Initially without gnu readline, the resulting GHCi is, of course,  
> without
> readline support. And after installing readline 5.1 via Darwin/ 
> MacPorts
> into /opt/local, I can re-build and this time get a GHCi with readline
> support, provided I "./configure --with-readline-includes=/opt/ 
> local/include/
> --with-readline-libraries=/opt/local/lib".
>
> The reason for the error is stated as "The bug is really that Apple  
> symlinks
> libreadline to libedit", but my system does not contain such a  
> symlink. Is it
> possible to set up this masquerading on a Mac OS X 10.3? Or would I  
> need to
> upgrade to 10.4? Or could something else again be required?
>

Libedit (and the symlink from /usr/lib/libreadline) were added in  
10.4. 10.3 should
not have this particular problem.

The "./configure --with-readline-includes=<prefix>/include --with- 
readline-libraries=<prefix>/lib
is what MacPorts uses internally to get ghc to use the readline  
installed by
MacPorts.  On 10.4, if you don't specify which readline to use by  
this method,
the configuration process will grab /usr/lib/libreadline.dylib, which  
is really libedit.
I submitted a patch to let configure determine if readline were  
libedit, and to
reject it.  This patch was applied for the 6.6 release.  It evidently  
needs to be applied
in more than one place.

Best Wishes,
Greg

> Thanks and regards
> Thorkil
>
> On Saturday 04 November 2006 00:14, Deborah Goldsmith wrote:
>> On Oct 30, 2006, at 2:40 PM, Deborah Goldsmith wrote:
>>> I think I have this partially figured out.
>>
>> The following patch to libraries/readline/configure.ac seems to do
>> the trick for Darwin:
>>
>> --- configure.ac.save   2006-10-10 12:09:04.000000000 -0700
>> +++ configure.ac        2006-11-02 17:32:50.000000000 -0800
>> @@ -43,7 +43,10 @@
>> dnl ** is our readline really readline, or is it BSD's libedit?
>> if test x"$HaveLibReadline" = xYES ; then
>> -  AC_CHECK_LIB(readline, rl_readline_version, ReadlineIsLibedit=NO,
>> ReadlineIsLibedit=YES)
>> +  AC_CHECK_DECL(rl_readline_version, ReadlineIsLibedit=NO,
>> ReadlineIsLibedit=YES,
>> +[#include <stdio.h>
>> +#include <readline/readline.h>
>> +])
>> fi
>> if test $HaveLibTermcap = YES && test x"$HaveLibReadline" = xYES &&
>> test x"$ReadlineIsLibedit" = xNO ; then
>> @@ -56,9 +59,12 @@
>> AC_SUBST(READLINE_LIBS)
>> if test x"$HaveLibReadline" = xYES && test x"$ReadlineIsLibedit" =
>> xNO ; then
>> -  AC_CHECK_LIB(readline, rl_erase_empty_line,
>> +  AC_CHECK_DECL(rl_erase_empty_line,
>>       [AC_DEFINE([HAVE_READLINE_4], [1], [Define to 1 if readline has
>> version >= 4.0.])],
>> -    [AC_DEFINE([HAVE_READLINE_4], [0], [Define to 1 if readline has
>> version >= 4.0.])])
>> +    [AC_DEFINE([HAVE_READLINE_4], [0], [Define to 1 if readline has
>> version >= 4.0.])],
>> +[#include <stdio.h>
>> +#include <readline/readline.h>
>> +])
>>     AC_CHECK_LIB(readline, rl_free_undo_list,
>>       [AC_DEFINE([HAVE_READLINE_4_2], [1], [Define to 1 if readline
>> has version >= 4.2.])],
>>       [AC_DEFINE([HAVE_READLINE_4_2], [0], [Define to 1 if readline
>> has version >= 4.2.])])
>>
>> When I build with this patch after configuring to look for GNU
>> readline in /usr/local, everything works. I don't know if this
>> particular patch will work well on other systems. Maybe folks could
>> try it out?
>>
>> Thanks,
>> Deborah
>>
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