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MAINT: remove outdated mingw32 fseek support#20907

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charris merged 1 commit intonumpy:maintenance/1.22.xfrom
charris:backport-20847
Jan 27, 2022
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MAINT: remove outdated mingw32 fseek support#20907
charris merged 1 commit intonumpy:maintenance/1.22.xfrom
charris:backport-20847

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@charris charris commented Jan 27, 2022

Backport of #20847.

_fseeki64 and _ftelli64 have been present in mingw-w64 for a long
time, see mingw-w64/mingw-w64@d66350e

This fixes an annoying build warning in the SciPy Meson build:

C:\hostedtoolcache\windows\Python\3.9.9\x64\lib\site-packages\numpy\core\include/numpy/npy_common.h:185:20: warning: 'int _fseeki64(FILE*, long long int, int)' redeclared without dllimport attribute after being referenced with dll linkage
  185 | extern int __cdecl _fseeki64(FILE *, long long, int);
      |                    ^~~~~~~~~
C:\hostedtoolcache\windows\Python\3.9.9\x64\lib\site-packages\numpy\core\include/numpy/npy_common.h:186:26: warning: 'long long int _ftelli64(FILE*)' redeclared without dllimport attribute after being referenced with dll linkage
  186 | extern long long __cdecl _ftelli64(FILE *);
      |                          ^~~~~~~~~

It's only happening for Pythran extensions, because Pythran uses fseek.
The cause is otherwise unrelated to Pythran though, it's npy_common.h
redefining something that's in mingw-w64.

`_fseeki64` and `_ftelli64` have been present in mingw-w64 for a long
time, see mingw-w64/mingw-w64@d66350e

This fixes an annoying build warning in the SciPy Meson build:
```
C:\hostedtoolcache\windows\Python\3.9.9\x64\lib\site-packages\numpy\core\include/numpy/npy_common.h:185:20: warning: 'int _fseeki64(FILE*, long long int, int)' redeclared without dllimport attribute after being referenced with dll linkage
  185 | extern int __cdecl _fseeki64(FILE *, long long, int);
      |                    ^~~~~~~~~
C:\hostedtoolcache\windows\Python\3.9.9\x64\lib\site-packages\numpy\core\include/numpy/npy_common.h:186:26: warning: 'long long int _ftelli64(FILE*)' redeclared without dllimport attribute after being referenced with dll linkage
  186 | extern long long __cdecl _ftelli64(FILE *);
      |                          ^~~~~~~~~
```

It's only happening for Pythran extensions, because Pythran uses `fseek`.
The cause is otherwise unrelated to Pythran though, it's `npy_common.h`
redefining something that's in mingw-w64.
@charris charris added this to the 1.22.2 release milestone Jan 27, 2022
@charris charris merged commit 06388b6 into numpy:maintenance/1.22.x Jan 27, 2022
@charris charris deleted the backport-20847 branch January 27, 2022 04:35
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