Re: [Bug-readline] Readline 6.3 cross-compilation fails

[Ludovic Courtès]

Chet Ramey <address@hidden> skribis:

> On 3/19/14 6:26 PM, Ludovic Courtès wrote:
>> Hi,
>> 
>> Readline 6.3’s configure fails when cross-compiling:
>> 
>> --8<---------------cut here---------------start------------->8---
>> [...]
>> 
>> checking whether mbrtowc and mbstate_t are properly declared... yes
>> checking for iswlower... yes
>> checking for iswupper... yes
>> checking for towlower... yes
>> checking for towupper... yes
>> checking for iswctype... yes
>> checking for nl_langinfo and CODESET... yes
>> checking for wchar_t in wchar.h... yes
>> checking for wctype_t in wctype.h... yes
>> checking for wint_t in wctype.h... yes
>> checking for wcwidth broken with unicode combining characters... configure: 
>> error: in `/tmp/nix-build-readline-6.3.drv-0/readline-6.3':
>> configure: error: cannot run test program while cross compiling
>> See `config.log' for more details
>> --8<---------------cut here---------------end--------------->8---
>> 
>> I fixed it in Guix by passing bash_cv_wcwidth_broken=no:
>> 
>>   
>> http://git.savannah.gnu.org/cgit/guix.git/commit/?id=f6d47eb6d5e046abc8a7a7dc0863c5661197ef0d
>> 
>> A fix might be to conservatively set bash_cv_wcwidth_broken=yes in the
>> fourth arm of AC_TRY_RUN (or better, AC_RUN_IFELSE.)
>
> I can't see how changing the default from `no' to `yes' is going to make a
> difference.

Oh sorry, I hadn’t noticed there’s already a fourth argument.

Looking at the generated configure file, that argument is clearly
ignored:

--8<---------------cut here---------------start------------->8---
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for wcwidth broken with 
unicode combining characters" >&5
$as_echo_n "checking for wcwidth broken with unicode combining characters... " 
>&6; }
if ${bash_cv_wcwidth_broken+:} false; then :
  $as_echo_n "(cached) " >&6
else
  if test "$cross_compiling" = yes; then :
  { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
as_fn_error $? "cannot run test program while cross compiling
See \`config.log' for more details" "$LINENO" 5; }
--8<---------------cut here---------------end--------------->8---

Could be due to underquoting?

> There is one thing that came up a few weeks back.  There is a typo in the
> definition of the wcwidth check:
>
> http://lists.gnu.org/archive/html/bug-readline/2014-02/msg00010.html
>
> That might make a difference, though I'm not sure how.

I don’t think it can make a difference.

Ludo’.