in reply to Re: Why does the h2xs -x switch not generate XSUBs?
in thread Why does the h2xs -x switch not generate XSUBs?

See, normally the order doesn't matter but in this case it obviously does. So noted. So I change the order, this time TwinTree.xs shows some improvement although I still can't see any actual XSUB code: 
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include "ppport.h"

#include <libtwintree.h>

#include "const-c.inc"

MODULE = TwinTree               PACKAGE = TwinTree

INCLUDE: const-xs.inc

int
return_one()

int
return_zero()

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Declarations are a good place to start, but the definitions are still missing. When trying 'make test' on the module, this is what I get: 
PERL_DL_NONLAZY=1 /usr/bin/perl "-MExtUtils::Command::MM" "-e" "test_h
+arness(0,                                             'blib/lib', 'bl
+ib/arch')" t/*.t
t/TwinTree....NOK 1
#   Failed test 'use TwinTree;'
#   at t/TwinTree.t line 9.
#     Tried to use 'TwinTree'.
#     Error:  Can't load '/home/floyd/twintree/TwinTree/blib/arch/auto
+/TwinTree/                                            TwinTree.so' fo
+r module TwinTree: /home/floyd/twintree/TwinTree/blib/arch/auto/T    
+                                        winTree/TwinTree.so: undefine
+d symbol: return_one at /usr/lib/perl5/5.8.8/i386-l                  
+                          inux-thread-multi/DynaLoader.pm line 230.
#  at (eval 4) line 2
# Compilation failed in require at (eval 4) line 2.
# BEGIN failed--compilation aborted at (eval 4) line 2.
# Looks like you failed 1 test of 1.
t/TwinTree....dubious
        Test returned status 1 (wstat 256, 0x100)
DIED. FAILED test 1
        Failed 1/1 tests, 0.00% okay
Failed Test  Stat Wstat Total Fail  Failed  List of Failed
----------------------------------------------------------------------
+---------
t/TwinTree.t    1   256     1    1 100.00%  1
Failed 1/1 test scripts, 0.00% okay. 1/1 subtests failed, 0.00% okay.
make[1]: *** [test_dynamic] Error 1
make[1]: Leaving directory `/home/floyd/twintree/TwinTree'
make: *** [TwinTree.pm] Error 2

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By the way, don't be scared by that handmade Makefile, that's for the C project. The h2xs generated Makefile.PL lives in the TwinTree subdirectory.

-- Time flies when you don't know what you're doing

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Re^3: Why does the h2xs -x switch not generate XSUBs?
by ikegami (Patriarch) on Jul 24, 2009 at 16:17 UTC

    although I still can't see any actual XSUB code

    No, what you have there is sufficient. 

    ...

int
return_one()

int
return_zero()

    [download]

    What you posted later is overkill. 

    ...

int
return_one()
  CODE:
    RETVAL = return_one();
  OUTPUT:
    RETVAL

int
return_zero()
  CODE:
    RETVAL = return_one();
  OUTPUT:
    RETVAL

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Re^3: Why does the h2xs -x switch not generate XSUBs?
by Anonymous Monk on Jul 24, 2009 at 12:14 UTC
    Declarations are a good place to start, but the definitions are still missing.

    I'm sorry, what?

    When trying 'make test' on the module, this is what I get

    How did you compile libtwintree? Does it export symbols return_one return_zero? Is libtwintree.so in path? What does ldd /blib/arch/auto/TwinTree/TwinTree.so return?

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      All my compile switches are in the Makefile, as are the commands for installing the .so into /usr/local/lib

      As for ldd blib/arch/auto/TwinTree/TwinTree.so it says 

              libc.so.6 => /lib/libc.so.6 (0xb7f24000)
        /lib/ld-linux.so.2 (0x0071d000)

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      -- Time flies when you don't know what you're doing
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        All my compile switches are in the Makefile...

        Of course they are :D ok, I can compile libtwintree with mingw(strawberryperl/win32), but it exports no symbols. So I end up with 

        TwinTree.o:TwinTree.c:(.text+0x29e): undefined reference to `return_on
+e'
TwinTree.o:TwinTree.c:(.text+0x3de): undefined reference to `return_ze
+ro'

        [download]

        Your ldd output shows it isn't looking for libtwintree , so whatever is going on, its all c to me :)

        All of this seems normal to me. Purpose of h2xs is for generating starting point, you have to do the c programming :)

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