labath added inline comments.

================
Comment at: include/lldb/Host/Editline.h:72-76
 #ifdef EL_CLIENTDATA   /* editline with wide support + wide char read function 
*/
 using EditLineGetCharType = wchar_t;
 #else
 using EditLineGetCharType = char;
 #endif
----------------
christos wrote:
> labath wrote:
> > christos wrote:
> > > labath wrote:
> > > > It's not fully clear to me whether this part is still correct. My 
> > > > understanding is that if we use `el_wset` to set the getchar callback, 
> > > > we should always use wchar_t, regardless of libedit version. This is 
> > > > only true if all wide-char capable libedit versions also define 
> > > > EL_CLIENTDATA.
> > > > 
> > > > Is this the case?
> > > I believe that you are correct: If you use el_wset, you should use 
> > > wchar_t. The problem is that for libedit versions prior to 2016-04-19 the 
> > > getchar function used char * for narrow and wchar_t * for wide. Versions 
> > > after that use wchar_t * for both. This was an accident due to some code 
> > > refactoring. If you are checking if that's the case or not, perhaps you 
> > > can determine this if el_rfunc_t is defined in histedit.h or not. 
> > > Unfortunately there is no compile time way to determine if that's the 
> > > case or not.
> > Thank, I can do that. Just to double-check, the condition you say here 
> > should be is:
> > ```
> > #if LLDB_EDITLINE_USE_WCHAR || defined(EL_CLIENTDATA) || 
> > LLDB_LIBEDIT_HAVE_EL_RFUNC_T
> > using EditLineGetCharType = wchar_t;
> > #else
> > using EditLineGetCharType = char;
> > #endif
> > ```
> > Is that right ?
> I think that's right. In any case it will probably fix cases that are 
> currently broken.
Thanks a lot. I've committed the patch with this condition updated.


Repository:
  rL LLVM

https://reviews.llvm.org/D47625



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