BUG: Avoid compilation error of wrapper file generated with SWIG >= 4.4 (#30128)#30130
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charris merged 1 commit intonumpy:maintenance/2.3.xfrom Nov 3, 2025
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….4 (numpy#30128) The `import_array` macro, which is defined in the file `numpy/core/code_generators/generate_numpy_api.py`, is intended for use inside an internal SWIG function that is called in the generated C wrapper file. This macro contains a return statement whose argument must match the function definition. Until version 4.3 of SWIG, the aforementioned function returned a `void*` value. However, in version 4.4, the return value was changed to `int`. This causes compilation of code using import_array() to fail with the following error message: `returning 'void *' from a function with return type 'int' makes integer from pointer without a cast [-Wint-conversion].` This commit resolves the issue by returning either `NULL` or `0`, depending on the SWIG version being used (< 3.4 or >= 3.4, respectively). This change has been successfully tested against SWIG versions 4.3 and 4.4. Closes: numpy#30122
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Backport of #30128.
The
import_arraymacro, which is defined in the filenumpy/core/code_generators/generate_numpy_api.py, is intended for use inside an internal SWIG function that is called in the generated C wrapper file. This macro contains a return statement whose argument must match the function definition.Until version 4.3 of SWIG, the aforementioned function returned a
void*value. However, in version 4.4, the return value was changed toint. This causes compilation of code using import_array() to fail with the following error message:returning 'void *' from a function with return type 'int' makes integer from pointer without a cast [-Wint-conversion].This commit resolves the issue by returning either
NULLor0, depending on the SWIG version being used (< 3.4 or >= 3.4, respectively). This change has been successfully tested against SWIG versions 4.3 and 4.4.Closes: #30122