Cross Compiling Broken

[p0fi]

The recent changes to the CMakeLists.txt broke cross compiling for the package.

The compiler gives the following error message:

-- Check if compiler accepts -pthread
CMake Error: TRY_RUN() invoked in cross-compiling mode, please set the following cache variables appropriately:
   THREADS_PTHREAD_ARG (advanced)
For details see /builds/buildroot/output/build/spdlog_setup-b18c8577ce0edc1c35b0ec5b7c45d7bffdd6dd18/TryRunResults.cmake
-- Check if compiler accepts -pthread - no
-- Found Threads: TRUE
-- The C compiler identification is GNU 7.3.0

It seems the changes you made to thread linking broke it for some reason.

#17 should fix this

[guangie88]

#17 resolves this 👍