We will have to check that this is actually the problem, but it may be that the lack of any exported symbols causes a problem when creating a shared library on Windows ( mesonbuild/wrapdb#1536 (comment) ). adbc.h has:
// Storage class macros for Windows
// Allow overriding/aliasing with application-defined macros
#if !defined(ADBC_EXPORT)
#if defined(_WIN32)
#if defined(ADBC_EXPORTING)
#define ADBC_EXPORT __declspec(dllexport)
#else
#define ADBC_EXPORT __declspec(dllimport)
#endif // defined(ADBC_EXPORTING)
#else
#define ADBC_EXPORT
#endif // defined(_WIN32)
#endif // !defined(ADBC_EXPORT)
https://github.com/apache/arrow-adbc/blob/main/adbc.h#L152-L164
(Although I think this is slightly incorrect in that _WIN32 should maybe be _MSC_VER to better support gcc on Windows via msys2).
We will have to check that this is actually the problem, but it may be that the lack of any exported symbols causes a problem when creating a shared library on Windows ( mesonbuild/wrapdb#1536 (comment) ). adbc.h has:
https://github.com/apache/arrow-adbc/blob/main/adbc.h#L152-L164
(Although I think this is slightly incorrect in that
_WIN32should maybe be_MSC_VERto better support gcc on Windows via msys2).