Re: T-Shark Cross Compilation issue

[Guy Harris <guy () alum mit edu>]

On Oct 16, 2009, at 1:34 PM, Jeff Morriss wrote:

> I think I may have (finally, after several wrong turns) figured out
> what's wrong with cross-compilation: we're not calling
> AC_CANONICAL_TARGET any more (this was commented out in rev 25232).

...presumably because it somehow caused problems with getting automake  
to have the Makefile create ustar tarballs by default:

        $ svn log configure.in

                ...

        ------------------------------------------------------------------------
        r25232 | gerald | 2008-05-05 10:03:22 -0700 (Mon, 05 May 2008) | 3  
lines

        Have autoconf generate "ustar" tar files by default. This should let  
us have
        paths longer than 99 characters.

                ...

and

        $ svn diff -r25231:25232 configure.in | more
        Index: configure.in
        ===================================================================
        --- configure.in        (revision 25231)
        +++ configure.in        (revision 25232)
        @@ -1,7 +1,5 @@
         # $Id$
         #
        -AC_INIT(cfile.h)
        -
         AC_PREREQ(2.52)

         dnl Check for CPU / vendor / OS
        @@ -12,9 +10,10 @@

         dnl AC_CANONICAL_HOST
         dnl AC_CANONICAL_BUILD
        -AC_CANONICAL_TARGET
        +dnl AC_CANONICAL_TARGET

        -AM_INIT_AUTOMAKE(wireshark, 1.0.99)
        +AC_INIT(wireshark, 1.0.99)
        +AM_INIT_AUTOMAKE(tar-ustar)

         AM_DISABLE_STATIC

> Just un-commenting it breaks things, so can you try to see if it works
> with configure.in starting like this:

Gerald?  What was the problem that made you comment those out?  Does  
moving the AC_CANONICAL_TARGET call after AC_INIT fix them?

(Also, Wireshark isn't a compiler, linker, assembler, or other build  
tool, so I don't think we need to worry about Canadian Cross builds;  
I'm not sure whether that means that we should remove  
AC_CANONICAL_TARGET and un-comment AC_CANONICAL_BUILD and  
AC_CANONICAL_HOST or not.  The autoconf documentation says, in the  
Obsolete Macros section:

        http://www.gnu.org/software/autoconf/manual/autoconf.html#Obsolete-Macros

that running AC_CANONICAL_TARGET is sufficient to run the other macros:

        — Macro: AC_CANONICAL_SYSTEM
        Determine the system type and set output variables to the names of  
the canonical system types. See Canonicalizing, for details about the  
variables this macro sets.

        The user is encouraged to use either AC_CANONICAL_BUILD, or  
AC_CANONICAL_HOST, or AC_CANONICAL_TARGET, depending on the needs.  
Using AC_CANONICAL_TARGET is enough to run the two other macros (see  
Canonicalizing).

although it doesn't say that in the Canonicalizing section, so I don't  
know whether that's a formal commitment or not.)
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