[GENERAL] Building tds_fdw Extension for Windows 64bit

Hello,

After reading Craig's excellent blog post at https://blog.2ndquadrant.com/compiling-postgresql-extensions-visual-studio-windows/ I decided to try and build a real extension - tds_fdw.

I've set it up in Visual Studio Community 2017, but am getting the following errors:

Error    C2375    'tds_fdw_handler': redefinition; different linkage    tds_fdw    E:\Workspace\git\tds_fdw\src\tds_fdw.c    118   
Error    C2375    'tds_fdw_validator': redefinition; different linkage    tds_fdw    E:\Workspace\git\tds_fdw\src\tds_fdw.c    156   

Full output:

1>------ Rebuild All started: Project: tds_fdw, Configuration: Release x64 ------
1>deparse.c
1>options.c
1>tds_fdw.c
1>src\tds_fdw.c(118): error C2375: 'tds_fdw_handler': redefinition; different linkage
1>E:\Workspace\git\tds_fdw\include\tds_fdw.h(130): note: see declaration of 'tds_fdw_handler'
1>src\tds_fdw.c(156): error C2375: 'tds_fdw_validator': redefinition; different linkage
1>E:\Workspace\git\tds_fdw\include\tds_fdw.h(131): note: see declaration of 'tds_fdw_validator'
1>Generating Code...
1>Done building project "tds_fdw.vcxproj" -- FAILED.
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========

I'm not sure if it's related, but the FreeTDS version that I found for Windows is marked as 32bit and I am trying to build for 64bit.

I believe that extensions like tds_fdw and pgloader will help users on TDS databases to migrate to Postgres and will improve adoption of the project.  I will be more than happy to publish my binaries of the extension if I ever get that far.

Can anyone help?

Thanks,