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dlaroche-ca
Joined: 03 Jul 2013
Posts: 32
Location: Montréal, Québec, Canada
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 Posted: Thu Mar 19, 2015 3:01 pm Post subject: building an extension module |
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I'm trying to build an extension module following the instructions in document "Extending and embedding Python" in the Python documentation set. I used the example in the document, the spam module. I put files spammodule.c and setup.py in a directory and then invoked
| Code: | | python setup.py build |
There is a C compiler on the VMS system where I work:
| Code: | MANGA: cc/version
HP C V7.2-022 on OpenVMS IA64 V8.3
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Unfortunately the build doesn't work. Here's the ouput of the setup script:
| Code: | MANGA: python setup.py build
running build
running build_ext
building 'spam' extension
creating build
creating build/temp.openvms-0-HP_rx2620__(1.60GHz-3.0MB)-2.7
mc cc -I/python_root/include/python2.7 -c spammodule.c /object= build/temp.openvms-0-HP_rx2620__(1.60GHz-3.0MB)-2.7/spammodule.obj
%DCL-W-ACTIMAGE, error activating image cc
-CLI-E-IMAGEFNF, image file not found MANGA$DKA0:[SYS0.SYSCOMMON.][SYSEXE]CC.EXE;
Traceback (most recent call last):
File "setup.py", line 8, in <module>
ext_modules = [module1])
File "/python_root/lib/distutils/core.py", line 151, in setup
dist.run_commands()
File "/python_root/lib/distutils/dist.py", line 953, in run_commands
self.run_command(cmd)
## many entries in the stack trace deleted...
File "/python_root/lib/distutils/spawn.py", line 138, in _spawn_vms
if rc[2] & 1 == 0:
IndexError: tuple index out of range
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Essentially the problem is that setup can't find the C compiler. I checked the keywords that can be passed to setup but I didn't find any to tell it where to find the C compiler.
Would someone have a suggestion?
Thanks. |
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dlaroche-ca
Joined: 03 Jul 2013
Posts: 32
Location: Montréal, Québec, Canada
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| Posted: Thu Mar 19, 2015 5:55 pm Post subject: |
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I found a previous post that discusses the subject. I tried script python_vms:build_module.py. The module now builds, but I can't import it. Here's how I structured the module:
| Code: | |
|--- spam
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|--- __init__.py
|--- _spam.exe
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__init__.py contains this
| Code: | from _spam import *
__version__ = '0.1'
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Now when I try to import it:
| Code: | MANGA: python
Python 2.7.8 (default, Sep 9 2014, 11:50:54) [DECC] on OpenVMS
Type "help", "copyright", "credits" or "license" for more information.
>>> import spam
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "spam/__init__.py", line 1, in <module>
from _spam import *
ImportError: dynamic module does not define init function (init_spam)
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Finally, here's the source code of the module:
| Code: | #include <Python.h>
static PyObject* spam_system (PyObject *self, PyObject *args);
static PyMethodDef SpamMethods[] = {
{"system", spam_system, METH_VARARGS,
"Execute a shell command."},
{NULL, NULL, 0, NULL}
};
static PyObject*
spam_system (PyObject *self, PyObject *args)
{
const char *command;
int sts;
if (!PyArg_ParseTuple (args, "s", command))
return NULL;
sts = system (command);
return Py_BuildValue ("i", sts);
}
PyMODINIT_FUNC
init_spam (void)
{
Py_InitModule ("_spam", SpamMethods);
}
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I can't see why the init function is not found.
Thanks again. |
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jfp
Joined: 12 Jul 2004
Posts: 633
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| Posted: Fri Mar 20, 2015 9:01 am Post subject: |
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Hello,
When you invoke the script script python_vms:build_module.py you need
to pass the correct case argument. You can try to be sure to use something like this:
| Code: | | $ python /python_vms/build_cython_module.py "_spam" |
JF |
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dlaroche-ca
Joined: 03 Jul 2013
Posts: 32
Location: Montréal, Québec, Canada
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| Posted: Fri Mar 20, 2015 3:50 pm Post subject: |
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Thanks for the reply. Unfortunately I'm still getting the same error. Here's the output of the build (I activated tracing with set verify):
| Code: | MANGA: python /PYTHON_vms/build_module.py "_spam"
@tmp:tmpCojJhw.com
$ @python_vms:python_compiler_options
$ define /noLog python_use_ieee_float true
$!!! define /noLog 'p1'python_use_tcpip_v6 true
$
$ define /noLog python_c_names "/names=(as_is,shortened)/accept=novaxc_keywords"
$! /MAIN=POSIX_EXIT here just for convenience
$ define /noLog python_c_debug "/nodebug/MAIN=POSIX_EXIT"
$ arch_name = f$getsyi("arch_name")
$ if arch_name .eqs. "IA64"
$ then
$ define /noLog python_c_optim "/optimize=(level=5,tune=itanium2)/architecture=itanium2"
$ else
$ endif
$
$ ieeefloat = f$trnlnm("python_use_ieee_float")
$ if ieeefloat .eqs. ""
$ else
$ define /noLog python_c_float "/float=ieee/IEEE_MODE=DENORM_RESULTS"
$ endif
$
$ tcpipv6 = f$trnlnm("python_use_tcpip_v6")
$ if tcpipv6 .nes. ""
$ else
$ if f$trnlnm("DECC$SYSTEM_INCLUDE") .nes. "" then -
deassign decc$system_include
$ if f$trnlnm("ARPA") .nes. "" then -
deassign ARPA
$ if f$trnlnm("NET") .nes. "" then -
deassign NET
$ if f$trnlnm("NETINET") .nes. "" then -
deassign NETINET
$ if f$trnlnm("SYS") .nes. "" then -
deassign SYS
$ endif
$ PYTHON_C_DEBUG = f$trnlnm("PYTHON_C_DEBUG")
$ PYTHON_C_FLOAT = f$trnlnm("PYTHON_C_FLOAT")
$ PYTHON_C_NAMES = f$trnlnm("PYTHON_C_NAMES")
$ PYTHON_C_OPTIM = f$trnlnm("PYTHON_C_OPTIM")
$ cc /nodebug/MAIN=POSIX_EXIT /float=ieee/IEEE_MODE=DENORM_RESULTS /names=(as_is,shortened)/accept=novaxc_keywords /optimize=(lev
el=5,tune=itanium2)/architecture=itanium2 -
/include=(python_include)/define=(_USE_STD_STAT=1,__USE_INO64=1,-
_LARGEFILE,__NEW_STARLET,_POSIX_EXIT=1) _spam.c
$ link/share=_spam.exe sys$input:/opt
GSMATCH=lequal,1,1000
case_sensitive=YES
SYMBOL_VECTOR = (init_spam=PROCEDURE)
SYMBOL_VECTOR = (INIT_SPAM/init_spam=PROCEDURE)
case_sensitive=NO
_spam.obj
pythonshr/share
%ILINK-W-NUDFSYMS, 1 undefined symbol:
%ILINK-I-UDFSYM, vms_system
%ILINK-W-USEUNDEF, undefined symbol vms_system referenced
section: $CODE$
offset: %X0000000000000050 slot: 2
module: _spam
file: TFC$USER:[EX36672.TMP.spam]_spam.OBJ;2
$
$ delete tmp:tmpCojJhw.com;*
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jfp
Joined: 12 Jul 2004
Posts: 633
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| Posted: Wed Mar 25, 2015 8:50 am Post subject: |
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So, the problem is that the _spam module call an unknown function "vms_system".
I can take a look if you give me a pointer on the source of _spam.c
JF |
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dlaroche-ca
Joined: 03 Jul 2013
Posts: 32
Location: Montréal, Québec, Canada
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| Posted: Wed Mar 25, 2015 10:32 pm Post subject: |
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| The code of the module is in the second post. Thanks. |
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jfp
Joined: 12 Jul 2004
Posts: 633
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| Posted: Thu Mar 26, 2015 9:59 am Post subject: |
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 forgotten that the source was already included.
I have found the problem, if you take a look at python_include:pyconfig.h
You will noticed that the function exit, system and wait are redefined but only vms_exit is exported in the shareable pythonshr.
I will fix this a forthcoming kit.
Thank for reporting.
JF |
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