(cmake) missing find_package(Threads) on UNIX

.travis.yml

@@ -39,33 +39,3 @@ matrix:
         - cmake -DUSE_TLS=1 -DUSE_WS=1 -DUSE_MBED_TLS=1 -DUSE_VENDORED_THIRD_PARTY=1 .
         - cmake --build --parallel .
         - python test/run.py
-
-install:
-  # HACK: gcc 8.0.1 is missing movdirintrin.h so just download it. We need this for GLM and Vectrexy to build.
-  - sudo wget https://raw.githubusercontent.com/gcc-mirror/gcc/gcc-8-branch/gcc/config/i386/movdirintrin.h -P /usr/lib/gcc/x86_64-linux-gnu/8/include/
-
-  # Create deps dir
-  - mkdir -p ${DEPS_DIR}
-
-  # Set compiler vars
-  - export CC=${CC_COMPILER}
-  - export CXX=${CXX_COMPILER}
-
-  # Install vcpkg and dependencies
-  - |
-    set -e
-    mkdir -p ${DEPS_DIR}/vcpkg
-    pushd ${DEPS_DIR}/vcpkg
-    git init
-    git remote add origin https://github.com/Microsoft/vcpkg.git
-    git fetch origin master
-    git checkout -b master origin/master
-    ./bootstrap-vcpkg.sh
-    # Only build release libs to save time. We inject a new line first since some cmake files don't end with one.
-    echo -e '\nset(VCPKG_BUILD_TYPE release)' >> ./triplets/${VCPKG_TRIPLET}.cmake
-    ./vcpkg install sdl2 sdl2-net glew glm stb imgui
-    popd
-
-cache:
-  directories:
-- ${DEPS_DIR}/vcpkg/installed

CMakeLists.txt

@@ -134,6 +134,11 @@ if (APPLE AND USE_TLS AND NOT USE_MBED_TLS)
   target_link_libraries(ixwebsocket "-framework foundation" "-framework security")
 endif()
 
+if (UNIX)
+  find_package(Threads)
+  target_link_libraries(ixwebsocket ${CMAKE_THREAD_LIBS_INIT})
+endif()
+
 if (USE_OPEN_SSL)
   find_package(OpenSSL REQUIRED)
   add_definitions(${OPENSSL_DEFINITIONS})