Hello,
could you consider to apply attached patch? It's used
to build gmpy2 bindings (Python) and for the mingw-w64-gmp.
Else build logs are flooded with warnings like:
../gmp-impl.h:4734:3: warning: 'dllexport' attribute ignored [-Wattributes]
4734 | DECL_copyd ((*copyd));
See
https://github.com/aleaxit/gmpy/blob/master/scripts/dll-importexport.diff
https://github.com/msys2/MINGW-packages/blob/master/mingw-w64-gmp/do-not-use-dllimport.diff
--- gmp-h.in.orig 2025-08-15 13:37:06.328877394 +0300
+++ gmp-h.in 2025-08-15 13:40:01.036262673 +0300
@@ -101,8 +101,13 @@
make use of that. Probably more trouble than it's worth. */
#if defined (__GNUC__)
+#ifndef __MINGW32__
#define __GMP_DECLSPEC_EXPORT __declspec(__dllexport__)
#define __GMP_DECLSPEC_IMPORT __declspec(__dllimport__)
+#else
+#define __GMP_DECLSPEC_EXPORT
+#define __GMP_DECLSPEC_IMPORT
+#endif
#endif
#if defined (_MSC_VER) || defined (__BORLANDC__)
#define __GMP_DECLSPEC_EXPORT __declspec(dllexport)
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