Re: [GENERAL] Building tds_fdw Extension for Windows 64bit

Thu, 02 Nov 2017 11:01:30 -0700 

On 11/2/2017 8:40 AM, Tom Lane wrote:

It looks to me like MSVC is complaining about the PGDLLEXPORT
markings that tds_fdw.c has on the function definitions
(not the extern declarations).  In the core code we only put
PGDLLEXPORT in extern declarations ... so try keeping it in
the externs and removing it from the .c file.

You may still get warnings that way, which I think you probably
have to live with, unless you want to make a .DEF file or use
--export-all-symbols as a substitute for PGDLLEXPORT'ing specific
functions.  For some sorry history around this see

https://www.postgresql.org/message-id/flat/A737B7A37273E048B164557ADEF4A58B539300BD%40ntex2010a.host.magwien.gv.at

                        regards, tom lane
Tom, thank you for chiming in on this.  I usually write Java code so am not very familiar with C/C++ or the inner workings of DLLs.  I would love to be able to compile this extension though, as it will help me and others migrate databases from MS SQL to Postgres.
I removed the PGDLLEXPORT declarations from _tds_fdw.c_ and added a _deffile_ (tried to rename it to _tds_fdw.def_ but VS2017 complained that it can't find _deffile_ so I renamed it back).  It looks like a similar concept as a MANIFEST.MF file in OSGi in Java where the manifest declares which packages are exported and which are imported.
So now I am getting the errors below.  Do I need to add an entry in _deffile_ for each error message?  What does the entry look like?
1>------ Rebuild All started: Project: tds_fdw, Configuration: Release x64 ------ 
1>deparse.c
1>options.c
1>tds_fdw.c
1>Generating Code...
1>   Creating library E:\Workspace\git\tds_fdw\x64\Release\tds_fdw.lib and object E:\Workspace\git\tds_fdw\x64\Release\tds_fdw.exp 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbbind referenced in function tdsGetRowCountShowPlanAll 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbclose referenced in function estimate_path_cost_size 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbcmd referenced in function tdsExecuteQuery 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbcolname referenced in function tdsGetColumnMetadata 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbcoltype referenced in function tdsGetColumnMetadata 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbconvert referenced in function tdsConvertToCString 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbiscount referenced in function tdsGetRowCountExecute 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbcount referenced in function tdsGetRowCountExecute 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbdata referenced in function tdsIterateForeignScan 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbdatecrack referenced in function tdsDatetimeToDatum 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbdatlen referenced in function tdsIterateForeignScan 1>tds_fdw.obj : error LNK2019: unresolved external symbol dberrhandle referenced in function estimate_path_cost_size 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbexit referenced in function estimate_path_cost_size 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbinit referenced in function estimate_path_cost_size 1>tds_fdw.obj : error LNK2019: unresolved external symbol dblogin referenced in function estimate_path_cost_size 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbloginfree referenced in function estimate_path_cost_size 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbmsghandle referenced in function estimate_path_cost_size 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbnextrow referenced in function tdsGetRowCountExecute 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbnumcols referenced in function tdsGetRowCountShowPlanAll 1>tds_fdw.obj : error LNK2019: unresolved external symbol tdsdbopen referenced in function tdsSetupConnection 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbresults referenced in function tdsExecuteQuery 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbsqlexec referenced in function tdsExecuteQuery 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbuse referenced in function tdsSetupConnection 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbwillconvert referenced in function tdsConvertToCString 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbsetlname referenced in function tdsSetupConnection 1>tds_fdw.obj : error LNK2019: unresolved external symbol dbsetlversion referenced in function tdsSetupConnection 1>E:\Workspace\git\tds_fdw\x64\Release\tds_fdw.dll : fatal error LNK1120: 26 unresolved externals 
1>Done building project "tds_fdw.vcxproj" -- FAILED.
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========

Thanks again,

Igal Sapir
Lucee Core Developer
Lucee.org <http://lucee.org/>

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