[Bug 1545899] Re: PYLONG_BITS_IN_DIGIT is misconfigured on g++

[Matthias Klose]

according to the upstream issue this is fixed since 2012.


** Bug watch added: Python Roundup #10052
   http://bugs.python.org/issue10052

** Also affects: python via
   http://bugs.python.org/issue10052
   Importance: Unknown
       Status: Unknown

** Changed in: python2.7 (Ubuntu)
       Status: New => Triaged

** Changed in: python2.7 (Ubuntu)
       Status: Triaged => Fix Released

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Title:
  PYLONG_BITS_IN_DIGIT is misconfigured on g++

Status in Python:
  Unknown
Status in python2.7 package in Ubuntu:
  Fix Released

Bug description:
  gcc and g++ interprets pyport.h in different way.

  ```
  (system) inada-n at oldbench:~$ cat longbits.c 
  #include <Python.h>
  #include <longintrepr.h>

  int main() {
          printf("digit bits = %d\n", PYLONG_BITS_IN_DIGIT);
          printf("sizeof(digit) = %lu\n", sizeof(digit));
  }
  (system) inada-n at oldbench:~$ gcc longbits.c -I /usr/include/python2.7/
  (system) inada-n at oldbench:~$ ./a.out 
  digit bits = 30
  sizeof(digit) = 4
  (system) inada-n at oldbench:~$ g++ longbits.c -I /usr/include/python2.7/
  (system) inada-n at oldbench:~$ ./a.out 
  digit bits = 15
  sizeof(digit) = 2
  ```

  This breaks some extension modules.  For example, see
  https://github.com/msgpack/msgpack-python/issues/169

  Please backport this bugfix.
  https://github.com/python/cpython/commit/050ba5ec1e941e05607ef29049bde08798387bcc

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