[Buildroot] [PATCH 1/1] ncftp: fix cross-compilation issues

[Romain Naour]

Hi Thomas, All,

Le 14/02/2014 09:53, Thomas Petazzoni a écrit :
> Dear Romain Naour,
>
> On Fri, 14 Feb 2014 02:45:48 +0100, Romain Naour wrote:
>> ncftp is unable to find ncurses library installed by ncurses package.
>> So ncftpbookmarks is not build and install fails.
>>
>> If ncurses is installed on the host machine then ncftp find it
>> and build ncftpbookmarks.
>>
>> To avoid that, we need to remove the cross-compilation test in
>> configure script and set ac_cv_prog_cc_cross=yes in ncftp.mk
> Can you expand a bit on the relation between ac_cv_prog_cc_cross=yes,
> and this story about ncurses? I don't quite see the connection between
> the two.

Sure, it was (very) late and I was not very clear in my explanations, sorry.

So, the problem is that the configure script assumes that it is doing 
native
compilation due to a false result of the cross-compilation test.

In this case an additional test is performed and fails if ncurses is not 
installed on the host machine.
(test #line 5893 "configure")
This test is skipped for cross-compilation.

This has resulted that the ncurses library support is disabled beneath 
the feet of ncftp's package.
Thus ncftpbootmarks is not build and install fails.

> That being said, I agree that the cross-compilation test is stupid: it
> builds a program, and tries to run it. If it runs, then the configure
> script concludes that we're doing native compilation, if it doesn't
> run, we're doing cross-compilation. Except that of course when you're
> building x86 or x86-64 on x86-64 and both the target and host use
> glibc, the program may very well run.
>
> Now, maybe we could simply patch the configure script to use something
> like what all other configure scripts are doing:
>
> cross_compiling=no
>
> if test "x$host_alias" != x; then
>    if test "x$build_alias" = x; then
>      cross_compiling=maybe
>      $as_echo "$as_me: WARNING: If you wanted to set the --build type, don't use --host.
>      If a cross compiler is detected then cross compile mode will be used." >&2
>    elif test "x$build_alias" != "x$host_alias"; then
>      cross_compiling=yes
>    fi
> fi
Ok, thanks !
I will rework my patch to do thatbut since we're cross-compiling,
should I take into account the "maybe" case ?

Best regards,
Romain Naour
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