[Python-Dev] MinGW And The other Py2.4 issue (original) (raw)

A.B., Khalid abkhd at hotmail.com
Mon Dec 13 17:43:18 CET 2004

Paul Moore wrote:

I tried this out, and from some basic uses, it seems to work OK. However, the PYD file references msvcrt.dll, which suggests that there will be issues in more complex cases. The biggest problem with CRT compatibility issues is that (AFAIK) no-one has actually been able to trigger a real error, all of the problems are still theoretical. I have done some fairly extensive analysis of what could go wrong, and I suspect that there are very few genuine cases where data from one CRT could end up being manipulated by another - but this doesn't mean that the problems aren't real, just VERY hard to locate :-(

First of all, thank you for your input. It is greatly appreciated. And yes if Martin, for whom I have much respect, can help here, then that would be awesome.

Okay. This is partly my own fault. I am not using a standard MinGW distribution. This is why there is no release date in the sys.version information of the Python I compiled. I am using GCC RC 3.4.1 but the linking is still done by the 2002 MinGW 3.2, which is most probably hard- wired to use msvcrt.dll. Having said that, however, let me quickly add that it is almost a certainity that the newer standard MinGW distributions link with the latest libraries.

Nevertheless, I updated pyMinGW's cygwinccompiler.py to always link in with libmsvcr71, and rebuit the sample pymingw extension[1]. Now according to objdump we get the following:

[CUT]

00007014 000070b0 00000000 00000000 00007420 00007158

    DLL Name: KERNEL32.dll
    vma:  Hint/Ord Member-Name Bound-To
    72fc        0  AddAtomA
    7308      147  FindAtomA
    7314      191  GetAtomNameA

00007028 000070c4 00000000 00000000 00007468 0000716c

    DLL Name: msvcr71.dll
    vma:  Hint/Ord Member-Name Bound-To
    7324       56  __dllonexit
    7334      189  _errno
    7340      610  ctime
    7348      619  fflush
    7354      630  fputs
    735c      634  free
    7364      642  fwrite
    7370      685  malloc
    737c      701  puts
    7384      724  strcmp
    7390      726  strcpy
    739c      730  strlen
    73a8      733  strncpy
    73b4      748  time

0000703c 00007104 00000000 00000000 00007478 000071ac

    DLL Name: msvcrt.dll
    vma:  Hint/Ord Member-Name Bound-To
    73bc      510  abort

00007050 00000000 00000000 00000000 00000000 00000000

There is an export table in .edata at 0x6000

[CUT]

So what see ye? :) Does it look good?

Best wishes Khalid

[1] pymingw-01.zip (5.37 KB): Location: http://jove.prohosting.com/iwave/misc/pymingw-01.zip MD5: 63b486093b344b0299538c952dea4ce1

Contents in KB:

PYMINGW PY 1.115 13/12/04 16:12 pymingw.py PYMINGW I 278 13/12/04 1:00 pymingw.i EXAMPLE C 848 13/12/04 0:23 example.c SETUP PY 192 13/12/04 0:59 setup.py _PYMINGW PYD 9.216 13/12/04 16:12 _pymingw.pyd

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