Thank you for your comments. 1. The #if ... defined(__ cplusplus) is necessary for the successful compilation of C++ llvmjit code that uses C headers. 2. #if defined(HAVE_GSS_API_H) && !defined(GSS_DLLIMP) is necessary for the successful link libgss.a provided by MSYS2. 3. Remember that you need to run autoreconf before running configure. 4. Found and fixed a small bug in the patch. Build in environment CentOS 7.7.1908 works. Build in environment MSYS2 gcc 9.2.0 works. Build in environment Visual Studio Community 2019 works.
The second version of the patch attached. Waiting for your comments. -- Best regards. Guram Duka.
postgresql-11.5-msys2-v2.patch
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