GNU bug report logs - #75786
python-fastbencode does not build the C extensions

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Dariqq <dariqq <at> posteo.net>
To: bug-guix <at> gnu.org
Subject: python-fastbencode does not build the C extensions
Date: Thu, 23 Jan 2025 15:00:46 +0000

Hello,
while troubleshooting some python things i got the following warning 
UserWarning: failed to load compiled extension: No module named 
'fastbencode._bencode_pyx'

Reason seems to be that something goes wrong during building:
Snippet of build log at 4241a5a4688e8a118b2f66423abd3ef8baae98fc


running build_ext
cythoning fastbencode/_bencode_pyx.pyx to fastbencode/_bencode_pyx.c

Error compiling Cython file:
------------------------------------------------------------
...
from cpython.mem cimport (
    PyMem_Free,
    PyMem_Malloc,
    PyMem_Realloc,
    )
from cpython.unicode cimport (
^
------------------------------------------------------------

fastbencode/_bencode_pyx.pyx:49:0: 
'cpython/unicode/PyUnicode_FromStringAndSize.pxd' not found

Error compiling Cython file:
------------------------------------------------------------
...
            raise ValueError('string size below zero: %d' % n)

        if self._bytestring_encoding == NULL:
            result = PyBytes_FromStringAndSize(self.tail, n)
        elif self._bytestring_encoding == b'utf-8':
            result = PyUnicode_FromStringAndSize(self.tail, n)
                    ^
------------------------------------------------------------

fastbencode/_bencode_pyx.pyx:201:21: 'PyUnicode_FromStringAndSize' is 
not a constant, variable or function identifier
building 'fastbencode._bencode_pyx' extension
creating build/temp.linux-x86_64-cpython-310
creating build/temp.linux-x86_64-cpython-310/fastbencode
gcc -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall 
-fno-semantic-interposition -fPIC -Ifastbencode 
-I/gnu/store/kayi1a27qjbizw1870vgpwd6mzcdggql-python-3.10.7/include/python3.10 
-c fastbencode/_bencode_pyx.c -o 
build/temp.linux-x86_64-cpython-310/fastbencode/_bencode_pyx.o
fastbencode/_bencode_pyx.c:1:2: error: #error Do not use this file, it 
is the result of a failed Cython compilation.
    1 | #error Do not use this file, it is the result of a failed 
Cython compilation.
      |  ^~~~~
warning: old_build_ext: building extension "fastbencode._bencode_pyx" 
failed: command 
'/gnu/store/86fc8bi3mciljxz7c79jx8zr4wsx7xw8-gcc-11.4.0/bin/gcc' failed 
with exit code 1

Message #8 received at 75786 <at> debbugs.gnu.org (full text, mbox):

From: Dariqq <dariqq <at> posteo.net>
To: 75786 <at> debbugs.gnu.org
Cc: Dariqq <dariqq <at> posteo.net>
Subject: [PATCH] gnu: python-fastbencode: Use python-cython-3
Date: Fri, 24 Jan 2025 07:51:25 +0000

The c extension does not build with regular python-cython.

* gnu/packages/python-xyz.scm (python-fastbencode)[native-inputs]: Replace
python-cython with with python-cython-3.

Change-Id: I9ecfdcfe1ff9fe8b3e5977d452f655b842e4d52d
---
 gnu/packages/python-xyz.scm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 9e5fa9a26c..2435ca8e98 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -18345,7 +18345,7 @@ (define-public python-fastbencode
        (sha256
         (base32 "15x1in22gwam7wwga5lbj1pd8hc9jk741pia3pv1m29n2xywpq2z"))))
     (build-system python-build-system)
-    (native-inputs (list python-cython))
+    (native-inputs (list python-cython-3))
     (home-page "https://github.com/breezy-team/fastbencode")
     (synopsis "Python Bencode (de)serializer with optional fast C extensions")
     (description

base-commit: 4241a5a4688e8a118b2f66423abd3ef8baae98fc
-- 
2.47.1

Message #13 received at 75786-done <at> debbugs.gnu.org (full text, mbox):

From: Sharlatan Hellseher <sharlatanus <at> gmail.com>
To: 75786-done <at> debbugs.gnu.org
Subject: python-fastbencode does not build the C extensions
Date: Fri, 24 Jan 2025 12:51:57 +0000

[Message part 1 (text/plain, inline)]

Hi,

It's built just fine now, thanks.
--8<---------------cut here---------------start------------->8---
> ./pre-inst-env guix build -P 1 python-fastbencode
guix build: computing dependents of package python-fastbencode <at> 0.3.1...
/gnu/store/krw4kw3hx4gv01p8i2n11iwcfy9gc3ig-python-fastbencode-0.3.1
/gnu/store/c8w87k9vpq6idl572146lnv8d7is2nn9-breezy-3.2.2
--8<---------------cut here---------------end--------------->8---

Pushed as:
origin/master 4dacc7856152278563011d8c00af645407ac8835

--
Oleg

[signature.asc (application/pgp-signature, inline)]

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