Basic mysql-native dub app does not compile with dmd 2.095.0

[reyvaleza]

I have an app written and running in Ubuntu but does not compile on Windows 10. I need it to run on Windows ten. The db server is MySQL 8.0.23. Here is the error I get:

empapp.obj : error LNK2001: unresolved external symbol _D5mysql12__ModuleInfoZ
.dub\build\application-debug-windows-x86_64-dmd_v2.095.0-dirty-BB4DEF503CB41185FCFD2A9F67C6DA61\empapp.exe : fatal error LNK1120: 1 unresolved externals
Error: linker exited with status 1120
C:\D\dmd2\windows\bin\dmd.exe failed with exit code 1.

Anybody who knows why? On my Windows machine, I uninstalled MySQL 8.0.23 and installed the older MySQL 5.7.32, then I compiled my project again. Same error.

[schveiguy]

How are you compiling your app? Are you using dub or dmd directly?

That error suggests that there is a missing symbol that would normally be included if you are linking against the mysql-native library. It's possible this is a compiler error, but also could just be related to how you are building.

Note that the installation of MySQL has nothing to do with building mysql-native. The library does not use any code/library from it, and does not require any access to a running server to build.

[schveiguy]

I'll also note that I don't regularly use Windows. So it might be hard to help, though I can certainly try to build if you post some minimal application to try, and how you build it.

[karitoy]

Thanks for your reply!
On Windows 10, simply create a new project with dub and compile and run the default project with dub to test that it runs. Then use dub to add mysql-native. Compile and run, and it will still run. Then in app.d (or a new class if you want), add an 'import mysql;' line. Compile and run. It won't compile. That is the simplest way I tested it, on two machines already.

[schveiguy]

oof! That is not good, I'll try it out. Thanks for the clear instructions!

[schveiguy]

I tried it, and it worked for me. But I was on compiler 2.094.0. I updated to 2.095, and get the error you are talking about. So it seems like it's a compiler error that either wasn't in 2.094 or was exposed with differences in the library.

Can you try building with 2.094 for now? I'll file an issue against the compiler.

[schveiguy]

Here is the archive for 2.094.2, if that doesn't work, I think I was on 2.094.0.

http://downloads.dlang.org/releases/2.x/2.094.2/

[schveiguy]

It happens without vibe-d as a dependency as well. I will try to narrow this down.

[karitoy]

Thanks a lot!

Thanks for the link to the older versions too!