Linking problems in MSVC++

Don Payette payettedon at
Wed Sep 6 13:22:58 UTC 2023

Well, the linker is giving me this error, plus other similar errors:

    Error LNK2019 unresolved external symbol _SSL_CTX_new referenced in
function ...

My code is calling SSL_CTX_new, so it appears something is adding an
underscore on the front.
I looked in libssl.def and SSL_CTX_new is there, but not _SSL_CTX_new.
Anybody know where
the underscore is coming from?

Don Payette
(cell) 479-216-6320 <(479)%20216-6320>

On Thu, Aug 31, 2023 at 11:53 AM Kenneth Porter <shiva at>

> On 8/31/2023 8:24 AM, Don Payette wrote:
> I'm using Microsoft Visual Studio, so no command line.
> In the linker settings there is an External Dependencies. I added
> libcrypto.lib and
> We'll see what happens.
> Open the project configuration, go to Configuration Properties | Linker |
> Command Line, and you can copy and paste the arguments that the IDE will
> pass to the linker. (There's a similar feature under C/C++ in that dialog
> for the command line compiler.) If it says "different options", you need to
> use the drop-down menus at the top of the dialog to select a specific
> configuration (like Debug and x64) to see the command line for that
> configuration.
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