From: =?utf-8?q?Timo_R=C3=B6hling?= Date: Mon, 3 Nov 2025 15:57:50 +0100 Subject: Avoid compilation error of wrapper file generated with SWIG >= 4.4 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit 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 patch resolves the issue by returning either `NULL` or `0`, depending on the SWIG version being used (< 4.4 or >= 4.4, respectively). This change has been successfully tested against SWIG versions 4.3 and 4.4. Author: Rafael Laboissière Forwarded: yes Bug: https://github.com/numpy/numpy/issues/30122 Bug-Debian: https://bugs.debian.org/1119878 --- numpy/_core/code_generators/generate_numpy_api.py | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/numpy/_core/code_generators/generate_numpy_api.py b/numpy/_core/code_generators/generate_numpy_api.py index dc11bcd..23d6788 100644 --- a/numpy/_core/code_generators/generate_numpy_api.py +++ b/numpy/_core/code_generators/generate_numpy_api.py @@ -157,6 +157,12 @@ _import_array(void) return 0; } +#if (SWIG_VERSION < 0x040400) +#define _RETURN_VALUE NULL +#else +#define _RETURN_VALUE 0 +#endif + #define import_array() { \ if (_import_array() < 0) { \ PyErr_Print(); \ @@ -164,7 +170,7 @@ _import_array(void) PyExc_ImportError, \ "numpy._core.multiarray failed to import" \ ); \ - return NULL; \ + return _RETURN_VALUE; \ } \ }