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Description
Bug summary
When the build gets tohttps://github.com/matplotlib/matplotlib/blob/main/src/_tkagg.cpp#L262-L273 on Cygwin, the build fails with a fewgoto crosses initialization warnings, which are easy to fix (closed by#23051), and twoerror: ‘PyErr_SetFromWindowsErr’ was not declared in this scope, which are less easy to fix.
Code for reproduction
pipinstallmatplotlib
Actual outcome
...lots of compiler command lines and some warnings (`array subscript has type 'char'`)... gcc ... -I/usr/include/python3.8 -c src/_tkagg.cpp -o build/temp.cygwin-3.3.4-x86_64-3.8/matplotlib.backends._tkagg/src/_tkagg.o -fvisibility=hidden -flto src/_tkagg.cpp: In function ‘void load_tkinter_funcs()’: src/_tkagg.cpp:263:9: error: ‘PyErr_SetFromWindowsErr’ was not declared in this scope 263 | PyErr_SetFromWindowsErr(0); | ^~~~~~~~~~~~~~~~~~~~~~~ src/_tkagg.cpp:271:9: error: ‘PyErr_SetFromWindowsErr’ was not declared in this scope 271 | PyErr_SetFromWindowsErr(0); | ^~~~~~~~~~~~~~~~~~~~~~~ src/_tkagg.cpp:283:1: error: jump to label ‘exit’ 283 | exit: | ^~~~ src/_tkagg.cpp:272:14: note: from here 272 | goto exit; | ^~~~ src/_tkagg.cpp:274:26: note: crosses initialization of ‘bool tk_ok’ 274 | bool tcl_ok = false, tk_ok = false; | ^~~~~ src/_tkagg.cpp:274:10: note: crosses initialization of ‘bool tcl_ok’ 274 | bool tcl_ok = false, tk_ok = false; | ^~~~~~ src/_tkagg.cpp:283:1: error: jump to label ‘exit’ 283 | exit: | ^~~~ src/_tkagg.cpp:268:14: note: from here 268 | goto exit; | ^~~~ src/_tkagg.cpp:274:26: note: crosses initialization of ‘bool tk_ok’ 274 | bool tcl_ok = false, tk_ok = false; | ^~~~~ src/_tkagg.cpp:274:10: note: crosses initialization of ‘bool tcl_ok’ 274 | bool tcl_ok = false, tk_ok = false; | ^~~~~~ src/_tkagg.cpp:283:1: error: jump to label ‘exit’ 283 | exit: | ^~~~ src/_tkagg.cpp:264:14: note: from here 264 | goto exit; | ^~~~ src/_tkagg.cpp:274:26: note: crosses initialization of ‘bool tk_ok’ 274 | bool tcl_ok = false, tk_ok = false; | ^~~~~ src/_tkagg.cpp:274:10: note: crosses initialization of ‘bool tcl_ok’ 274 | bool tcl_ok = false, tk_ok = false; | ^~~~~~ error: command '/usr/bin/gcc' failed with exit code 1...pip reminds me this is not pip's faultExpected outcome
...Successfully installed collected packages: matplotlibAdditional information
Cygwin 3.3.4
GCC 11.2.0
Python 3.8.12
I've installed matplotlib in earlier versions.#17415 rather suggests that Cygwin builds worked at that time, and probably made using the default backend somewhat easier.#22445 seems to be where thePyErr_SetFromWindowsErr calls came in.
I've attempted to create a dummyPyErr_SetFromWindowsErr on Cygwin, but, given the number of failures in the test suite, I probably didn't do it right.
Operating system
Cygwin 3.3.4 on Windows 10
Matplotlib Version
3.5.2
Matplotlib Backend
TkAgg
Python version
3.8.12
Jupyter version
N/A
Installation
pip