Hello, can anyone help? All assistance gratefully received. I am
running python 3.13.3 on a Windows 11 machine and trying to do
pip install matplotlib
(No, I don't need to say "python -m ...", I am running the right version
of python.exe.)
This starts by generating the following output (which I can catch by
redirecting it to a file)
Collecting matplotlib
Using cached matplotlib-3.10.6.tar.gz (34.8 MB)
Installing build dependencies: started
Installing build dependencies: finished with status 'done'
Getting requirements to build wheel: started
Getting requirements to build wheel: finished with status 'done'
Installing backend dependencies: started
Installing backend dependencies: finished with status 'done'
Preparing metadata (pyproject.toml): started
Preparing metadata (pyproject.toml): finished with status 'error'
then prints error messages on the screen which are scrolled out too fast
to see, but end as follows:
3: note: in expansion of macro 'PYBIND11_COMPAT_STRDUP'
rec_fget->doc =
PYBIND11_COMPAT_STRDUP(rec_fget->doc);
^~~~~~~~~~~~~~~~~~~~~~
C:\Users\robcl\AppData\Local\Temp\pip-build-env-1ud913ho\overlay\Lib\site-packages\pybind11\include/pybind11/pybind11.h:248:36:
note: (if you use '-fpermissive', G++ will accept your code, but
allowing the use of an undeclared name is deprecated)
# define PYBIND11_COMPAT_STRDUP strdup
^~~~~~
C:\Users\robcl\AppData\Local\Temp\pip-build-env-1ud913ho\overlay\Lib\site-packages\pybind11\include/pybind11/pybind11.h:2379:33:
note: in expansion of macro 'PYBIND11_COMPAT_STRDUP'
rec_fget->doc =
PYBIND11_COMPAT_STRDUP(rec_fget->doc);
^~~~~~~~~~~~~~~~~~~~~~
C:\Users\robcl\AppData\Local\Temp\pip-build-env-1ud913ho\overlay\Lib\site-packages\pybind11\include/pybind11/pybind11.h:248:36:
error: there are no arguments to 'strdup' that depend on a template
parameter, so a declaration of 'strdup' must be available [-fpermissive]
# define PYBIND11_COMPAT_STRDUP strdup
^~~~~~
C:\Users\robcl\AppData\Local\Temp\pip-build-env-1ud913ho\overlay\Lib\site-packages\pybind11\include/pybind11/pybind11.h:2387:33:
note: in expansion of macro 'PYBIND11_COMPAT_STRDUP'
rec_fset->doc =
PYBIND11_COMPAT_STRDUP(rec_fset->doc);
^~~~~~~~~~~~~~~~~~~~~~
In file included from ../src/_backend_agg_basic_types.h:17,
from ../src/_backend_agg.h:41,
from ../src/_backend_agg_wrapper.cpp:6:
../src/py_adaptors.h: In member function 'void
mpl::PathIterator::set(pybind11::object, pybind11::object, bool, double)':
../src/py_adaptors.h:96:57: warning: comparison of integer
expressions of different signedness: 'pybind11::ssize_t' {aka 'int'} and
'unsigned int' [-Wsign-compare]
if (m_codes.ndim() != 1 || m_codes.shape(0) !=
m_total_vertices) {
~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
../src/_backend_agg_wrapper.cpp: In lambda function:
../src/_backend_agg_wrapper.cpp:253:37: warning: narrowing
conversion of 'renderer->RendererAgg::get_height()' from 'unsigned int'
to 'int' inside { } [-Wnarrowing]
renderer->get_height(),
~~~~~~~~~~~~~~~~~~~~^~
../src/_backend_agg_wrapper.cpp:253:37: warning: narrowing
conversion of 'renderer->RendererAgg::get_height()' from 'unsigned int'
to 'int' inside { } [-Wnarrowing]
../src/_backend_agg_wrapper.cpp:254:36: warning: narrowing
conversion of 'renderer->RendererAgg::get_width()' from 'unsigned int'
to 'int' inside { } [-Wnarrowing]
renderer->get_width(),
~~~~~~~~~~~~~~~~~~~^~
../src/_backend_agg_wrapper.cpp:254:36: warning: narrowing
conversion of 'renderer->RendererAgg::get_width()' from 'unsigned int'
to 'int' inside { } [-Wnarrowing]
../src/_backend_agg_wrapper.cpp:258:39: warning: narrowing
conversion of '(renderer->RendererAgg::get_width() * 4)' from 'unsigned
int' to 'int' inside { } [-Wnarrowing]
renderer->get_width() * 4,
~~~~~~~~~~~~~~~~~~~~~~^~~
../src/_backend_agg_wrapper.cpp:258:39: warning: narrowing
conversion of '(renderer->RendererAgg::get_width() * 4)' from 'unsigned
int' to 'int' inside { } [-Wnarrowing]
ninja: build stopped: subcommand failed.
INFO: autodetecting backend as ninja
INFO: calculating backend command to run:
C:\Users\robcl\AppData\Local\Temp\pip-build-env-1ud913ho\normal\Scripts\ninja.EXE
[end of output]
note: This error originates from a subprocess, and is likely not a
problem with pip.
error: metadata-generation-failed
× Encountered error while generating package metadata.
╰─> See above for output.
note: This is an issue with the package mentioned above, not pip.
hint: See above for details.
Best wishes
Rob Cliffe
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