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Thread: pnet-0.8.0 configuration may fail to recognize the correct thread mod
pnet-0.8.0 configuration may fail to recognize the correct thread mod
country flaguser name
United States		 2007-03-08 02:28:13 
URL:
  <http://savann
ah.gnu.org/bugs/?19237>

                 Summary: pnet-0.8.0 configuration may fail
to recognize the
correct thread model under glibc>=2.4
                 Project: DotGNU Portable.NET
            Submitted by: None
            Submitted on: Thursday 03/08/2007 at 08:28 UTC
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

    _______________________________________________________

Details:

Apologies if I'm wrong.

When building pnet-0.8.0 under glibc>=2.4 the
configuration
process may fail in the absence of an explicit
--enable-threads=... option.

glibc>=2.4 has dropped support for linuxthreads (almost)
and
supports only NPTL.

As a consequence, in order to build gcc against
glibc>=2.4
one has to use --disable-threads (or the equivalent
--enable-threads=single). This, in turn, implies that
"gcc
-v" will emit:

     Using built-in specs.
     Target: i686-pc-linux-gnu
     Configured with: ../configure 
                --prefix=/usr/local/gcc-4.1.2 
                --disable-threads --enable-__cxa_atexit
     vvvvvvvvvvvvvvvvvvvv
     Thread model: single
     ^^^^^^^^^^^^^^^^^^^^
     gcc version 4.1.2

Now, pnet-0.8.0/configure will capture the correct thread
model in either presence or absence of --enable-threads
option, since it tests the $host variable to make a
decision
when --enable-threads has not been given.

However, in pnet-0.8.0/libgc/configure the $host variable
is
not tested and only the output of "gcc -v" is
considered (in
the absence of --enable-threads option). Since "gcc
-v"
returns "Thread model: single" when built against
glibc>=2.4, pnet-0.8.0/libgc/configure assumes no
threads
and compilation crashes.

No problem if one configures with --enable-threads=posix,
but I'm wondering whether things should go smoothly also
when one issues a simple "configure" without any
option (as
it used to work in the past).







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pnet-0.8.0 configuration may fail to recognize the correct thread mod
country flaguser name
United States		 2007-03-08 03:17:23 
Follow-up Comment #1, bug #19237 (project dotgnu-pnet):

Sorry, I forgot to give OS specs:


Linux kernel 2.6.20.1 #1 Thu Feb 22 08:57:58 CET 2007 i686
GNU/Linux

cheers
gabriele


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pnet-0.8.0 configuration may fail to recognize the correct thread mod
country flaguser name
United States		 2007-03-08 13:15:35 
Follow-up Comment #2, bug #19237 (project dotgnu-pnet):

Thanks for the hint.

The configure.in script in libgc is an allmost 1:1 copy of
the libgc 6.8
release.

So i think this issue has to be posted upstream.

I'll send this to the libgc mailing list too.



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pnet-0.8.0 configuration may fail to recognize the correct thread mod
country flaguser name
United States		 2007-03-22 10:10:43 
Follow-up Comment #3, bug #19237 (project dotgnu-pnet):

Hi,

just having some spare time and looked at libgc docs.

I don't know if you have done some progress on this.

As far as I seem to understand, gc requires *explicit*
thread support 
option.
>From README.QUICK:
"If you need thread support, you will need to either
follow the special
platform-dependent instructions (win32), or add a suitable
define option as
described in Makefile."

On the other hand, pnet configure switches thread support on
if it finds the
conditions.

So:
=> either you change pnet idea about thread support,
making it     require an
explicit option to be supplied (and change accordingly
installation
instructions)
=> or you change gc configure to make it guess, similarly
to pnet's
configure

>From the installer's point of view (i.e. me) I would say
it's better and
cleaner that thread support is switched on based on
(intelligent) guess: so
one just says ./configure and all the available features
found on the system
are included. (if one
does NOT want an otherwise available feature, then that's
her responsibility
to explicitly disable it, isn't it?) Well, I guess that this
is the reason
why autoconf has been created, after all.

I don't know what is the best way to implement this: perhaps
call gc's
configure with --enable-threads if pnet's configure has
found the good
conditions...


Hope to be of any use
Ciao
Gabriele

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country flaguser name
United States		 2007-03-22 14:14:59 
Follow-up Comment #4, bug #19237 (project dotgnu-pnet):

I've attached a patch that might fix the issue.

Can you try and see if it's ok ?

(file #12236)
    _______________________________________________________

Additional Item Attachment:

File name: kt-070322.patch                Size:1 KB


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pnet-0.8.0 configuration may fail to recognize the correct thread mod
country flaguser name
United States		 2007-03-23 03:24:54 
Follow-up Comment #5, bug #19237 (project dotgnu-pnet):

The patch seems to fix things: I can build with thread
support out of the box
with a simple ./configure (i.e. no explicit --enable-threads
required any
more)

I've only noticed that also libffi/configure is called with
the
--enable-threads option, where it does not seem to have one:
should be
harmless, however.


Thanks a lot


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