Using APCpp as submodule fails when mbedtls is enabled

[Martmists-GH]

Code:

set(USE_TLS 1)
set(USE_MBED_TLS 1)
set(USE_ZLIB 0)
add_subdirectory(APCpp/)  # Cloned recursively

Error:

CMake Error at /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:233 (message):
  Could NOT find MbedTLS (missing: MBEDTLS_INCLUDE_DIRS MBEDTLS_LIBRARY
  MBEDX509_LIBRARY MBEDCRYPTO_LIBRARY)
Call Stack (most recent call first):
  /usr/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:603 (_FPHSA_FAILURE_MESSAGE)
  APCpp/IXWebSocket/CMake/FindMbedTLS.cmake:13 (find_package_handle_standard_args)
  APCpp/IXWebSocket/CMakeLists.txt:221 (find_package)

[N00byKing]

You should not need to specify the USE_TLS and USE_MBED_TLS variables, they might break things instead.
Is it defaulting to another library?
Another thing to try is to give a specific output folder for APCpp, which might make CMake less confused. Try something like add_subdirectory(APCpp/ apcppout)

[Martmists-GH]

If those two flags are not set it'll try to use openssl instead, which is not available on the device I'm targeting.

It seems to resolve mbedtls if I set WIN32, but that'll probably cause more problems.

[N00byKing]

I've changed it so that setting USE_MBED_TLS will force the library to use it. Could you try again?

EDIT: Out of curiosity, what platform is it you're trying to use?

[Martmists-GH]

I'm targetting the Nintendo Switch. I'll try again in a moment, currently trying to get patch ixwebsocket so it works on its own.

[mxd1760]

I had a similar problem and tried fixing it with #22. Does #22 fix it for you too?