Re: [Ocamlnet-devel] [Caml-list] [ANN] Ocamlnet-3.5

[Gerd S. <in...@ge...>]

Am Mittwoch, den 29.02.2012, 09:57 +0100 schrieb Stéphane Glondu:
> Le 23/02/2012 00:04, Gerd Stolpmann a écrit :
> > it is time for another version of Ocamlnet. The new release 3.5 focuses on
> > the system interface, and includes a long list of smaller improvements.
> > [...]
> 
> It seems that this new release adds a new dependency to threads in some
> situations:
> 
> $ cat test.ml
> let () = ignore (Netconversion.ustring_of_uchar `Enc_utf8 0)
> $ ocamlfind ocamlopt -package netstring -linkpkg test.ml
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_sem.o): In function
> `free_sem_block':
> (.text+0x58): undefined reference to `sem_close'
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_sem.o): In function
> `netsys_sem_open':
> (.text+0xba): undefined reference to `sem_open'
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_sem.o): In function
> `netsys_sem_close':
> (.text+0x10c): undefined reference to `sem_close'
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_sem.o): In function
> `netsys_sem_unlink':
> (.text+0x13a): undefined reference to `sem_unlink'
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_sem.o): In function
> `netsys_sem_init':
> (.text+0x178): undefined reference to `sem_init'
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_sem.o): In function
> `netsys_sem_destroy':
> (.text+0x1d8): undefined reference to `sem_destroy'
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_sem.o): In function
> `netsys_sem_getvalue':
> (.text+0x220): undefined reference to `sem_getvalue'
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_sem.o): In function
> `netsys_sem_post':
> (.text+0x272): undefined reference to `sem_post'
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_sem.o): In function
> `netsys_sem_wait':
> (.text+0x2cc): undefined reference to `sem_wait'
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_sem.o): In function
> `netsys_sem_wait':
> (.text+0x2d8): undefined reference to `sem_trywait'
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_spawn.o): In function
> `netsys_spawn_nat':
> (.text+0x81): undefined reference to `pthread_sigmask'
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_spawn.o): In function
> `netsys_spawn_nat':
> (.text+0xa7b): undefined reference to `pthread_sigmask'
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_spawn.o): In function
> `netsys_spawn_nat':
> (.text+0xb6d): undefined reference to `pthread_sigmask'
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_subprocess.o): In function
> `sigchld_lock':
> (.text+0x34): undefined reference to `pthread_sigmask'
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_subprocess.o): In function
> `sigchld_unlock':
> (.text+0x11a): undefined reference to `pthread_sigmask'
> /usr/lib/ocaml/netsys/libnetsys.a(netsys_c_subprocess.o): In function
> `netsys_watch_subprocess':
> (.text+0x65e): undefined reference to `pthread_create'
> collect2: ld returned 1 exit status
> File "caml_startup", line 1, characters 0-1:
> Error: Error during linking
> $ ocamlfind ocamlopt -thread -package netstring -linkpkg test.ml
> $ echo $?
> 0
> 
> Whith ocamlnet 3.4.1, the -thread switch was not needed. Is that
> expected? Even if it is, I would expect a more explanatory error message...

Hmmm, this is strange. Looks like -lrt and -lpthread are missing in the
link. The -thread switch shouldn't be necessary.

The strange thing is that this aspect did not change between 3.4.1 and
3.5. Already 3.4.1 used pthread directly (no matter whether -thread was
given or not given), in order to handle the case correctly where some C
library routine starts hidden pthreads.

I'll investigate.

Gerd


> 
> Cheers,
> 

-- 
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Gerd Stolpmann, Darmstadt, Germany    ge...@ge...
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Company homepage:       http://www.gerd-stolpmann.de
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