I'm trying to call a function from the windows platform libraries: `BCryptGenRandom`. At link time, ...

# multiplatform

[basher]

I'm trying to call a function from the windows platform libraries: BCryptGenRandom. At link time, I get undefined reference to 'BCryptGenRandom'. Here are the linker settings I have for my mingw test target:

targetFromPreset(presets.mingwX64, 'mingw') {
    compilations.test.linkerOpts '-Wl,--subsystem,windows,-L"C:\\Program Files (x86)\\Windows Kits\\10\\Lib\\10.0.17763.0\\um\\x64\\bcrypt.lib"'
}

I think I may have overdone it with the full path to bcrypt.lib there, but I'm trying everything. Any advice here would be appreciated! First time attempting to get my K/N code working for mingw. Thanks!

[basher]

i've also tried just compilations.test.linkerOpts '-Wl,--subsystem,windows to match the win32 example in the K/N repo

[msink]

Mingw is not compatible with with libs in msvc format, please use libs from msys2-mingw64 distribution.

[basher]

Ah! I’ll give that a try. Thanks!

[olonho]

no need to use lib file here, just -lbcrypt in linker options works for me. Technically, it’s a bug in platform libs, so we’ll fix it in upcoming releases.

[basher]

Thanks I was just about to update that I got it working this way: compilations.test.linkerOpts "-Wl,--subsystem,windows, -Bstatic -lbcrypt". I also happened to have just installed msys2 and the associated mingw-w64-x86_64-toolchain (installs the platform libs to "C:\msys64\mingw64\lib"). Did I need that, or would -lbcrypt have worked without installing those libs?

[basher]

Also, is there a ticket I can follow for the bug?

[olonho]

https://github.com/JetBrains/kotlin-native/commit/a8be93d8416f9a2edcb50acb3f4b3b97cb252348

[olonho]

no need to install anything

[basher]

Ha! It's literally just bcrypt. Thanks for all of that!