Re: [PATCH 2/6] Only define NEEDS_SOCKET if libsocket is usable

["Andreas Färber" <andreas.faerber@web.de>]

Am 17.08.2008 um 11:16 schrieb Junio C Hamano:

> Andreas Färber <andreas.faerber@web.de> writes:
>
>> diff --git a/configure.ac b/configure.ac
>> index 7c2856e..75ec83a 100644
>> --- a/configure.ac
>> +++ b/configure.ac
>> @@ -223,11 +223,11 @@ AC_LINK_IFELSE(ZLIBTEST_SRC,
>> LIBS="$old_LIBS"
>> AC_SUBST(NO_DEFLATE_BOUND)
>> #
>> -# Define NEEDS_SOCKET if linking with libc is not enough (SunOS,
>> +# Define NEEDS_SOCKET if linking with libc is required (SunOS,
>> # Patrick Mauritz).
>> -AC_CHECK_LIB([c], [socket],
>> -[NEEDS_SOCKET=],
>> -[NEEDS_SOCKET=YesPlease])
>> +AC_CHECK_LIB([socket], [socket],
>> +[NEEDS_SOCKET=YesPlease],
>> +[NEEDS_SOCKET=])
>> AC_SUBST(NEEDS_SOCKET)
>> test -n "$NEEDS_SOCKET" && LIBS="$LIBS -lsocket"
>
> Doesn't this force linkage with -lsocket even if -lc is enough to use
> socket(2) calls?

If both libc and libsocket provide it, yes.

> In other words, "checking libc is not enough" is only half correct.   
> The
> right thing to do is "check libc and if it is sufficient be happy, but
> otherwise do not automatically assume -lsocket is Ok."  Something  
> like:
>
> AC_CHECK_LIB([c], [socket],
> [NEEDS_SOCKET=],
> [AC_CHECK_LIB([socket], [socket],
>        	[NEEDS_SOCKET=YesPlease],
>                [NEEDS_SOCKET=])])

Looks okay to me that way.

> Other patches seemed Ok from my cursory look; I do not know the
> people whose Ack's were on your patch submission, though...

Sorry for not explaining: Ingo is one of the core Haiku developers,  
and Scott is from HaikuPorts. This is the initial submission to this  
list, trying to adhere to the SubmittingPatches document.

Andreas