Add wasm32-emscripten-pthread-release overlay triplet

Author: fwcd

overlay/triplets/wasm32-emscripten-pthread-release.cmake

@@ -0,0 +1,28 @@
+set(VCPKG_ENV_PASSTHROUGH_UNTRACKED EMSCRIPTEN_ROOT EMSDK PATH)
+
+if(NOT DEFINED ENV{EMSCRIPTEN_ROOT})
+   find_path(EMSCRIPTEN_ROOT "emcc")
+else()
+   set(EMSCRIPTEN_ROOT "$ENV{EMSCRIPTEN_ROOT}")
+endif()
+
+if(NOT EMSCRIPTEN_ROOT)
+   if(NOT DEFINED ENV{EMSDK})
+      message(FATAL_ERROR "The emcc compiler not found in PATH")
+   endif()
+   set(EMSCRIPTEN_ROOT "$ENV{EMSDK}/upstream/emscripten")
+endif()
+
+if(NOT EXISTS "${EMSCRIPTEN_ROOT}/cmake/Modules/Platform/Emscripten.cmake")
+   message(FATAL_ERROR "Emscripten.cmake toolchain file not found")
+endif()
+
+set(VCPKG_TARGET_ARCHITECTURE wasm32)
+set(VCPKG_CRT_LINKAGE dynamic)
+set(VCPKG_LIBRARY_LINKAGE static)
+set(VCPKG_CMAKE_SYSTEM_NAME Emscripten)
+set(VCPKG_CHAINLOAD_TOOLCHAIN_FILE "${EMSCRIPTEN_ROOT}/cmake/Modules/Platform/Emscripten.cmake")
+
+set(ENV{EMCC_CFLAGS} "$ENV{EMCC_CFLAGS} -pthread")
+
+set(VCPKG_BUILD_TYPE release)