BUG: fix f2py's define for threading when building with Mingw #20909
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Closes rgommers/scipy#125 This is a follow-up of numpygh-18910 (included in 1.20.3 and 1.21.0), which looks incorrect. This fixes warnings like these when building SciPy with Mingw-w64: ``` [94/1557] Compiling C object scipy/linalg/_flapack.cp39-win_amd64.pyd.p/meson-generated_..__flapackmodule.c.obj In file included from C:\hostedtoolcache\windows\Python\3.9.9\x64\lib\site-packages\numpy\core\include/numpy/ndarraytypes.h:4, from C:\hostedtoolcache\windows\Python\3.9.9\x64\lib\site-packages\numpy\core\include/numpy/ndarrayobject.h:12, from C:\hostedtoolcache\windows\Python\3.9.9\x64\lib\site-packages\numpy\core\include/numpy/arrayobject.h:4, from C:\hostedtoolcache\windows\Python\3.9.9\x64\lib\site-packages\numpy\f2py\src/fortranobject.h:13, from scipy/linalg/_flapackmodule.c:16: scipy/linalg/_flapackmodule.c:1248:1: warning: 'thread' attribute directive ignored [-Wattributes] 1248 | static F2PY_THREAD_LOCAL_DECL cb_cselect_in_gees__user__routines_t *_active_cb_cselect_in_gees__user__routines = NULL; | ^~~~~~ scipy/linalg/_flapackmodule.c:1410:1: warning: 'thread' attribute directive ignored [-Wattributes] 1410 | static F2PY_THREAD_LOCAL_DECL cb_zselect_in_gees__user__routines_t *_active_cb_zselect_in_gees__user__routines = NULL; | ^~~~~~ scipy/linalg/_flapackmodule.c:1572:1: warning: 'thread' attribute directive ignored [-Wattributes] 1572 | static F2PY_THREAD_LOCAL_DECL cb_sselect_in_gees__user__routines_t *_active_cb_sselect_in_gees__user__routines = NULL; | ^~~~~~ scipy/linalg/_flapackmodule.c:1738:1: warning: 'thread' attribute directive ignored [-Wattributes] 1738 | static F2PY_THREAD_LOCAL_DECL cb_dselect_in_gees__user__routines_t *_active_cb_dselect_in_gees__user__routines = NULL; | ^~~~~~ ... ``` Also fixes numpygh-19437, where `__STDC_NO_THREADS__` should be defined but isn't (this seems to be more common, e.g. one can reports for ICC about this).
charris
added
00 - Bug
component: numpy.f2py
08 - Backport
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Backport of #20881.
Closes rgommers/scipy#125
This is a follow-up of gh-18910 (included in 1.20.3 and 1.21.0), which
looks incorrect.
This fixes warnings like these when building SciPy with Mingw-w64:
Also fixes gh-19437, where
__STDC_NO_THREADS__should be defined butisn't (this seems to be more common, e.g. one can reports for ICC about
this).