@@ -0,0 +1,47 @@
+if(NOT _VCPKG_EMSCRIPTEN_TOOLCHAIN)
+    set(_VCPKG_EMSCRIPTEN_TOOLCHAIN 1)
+
+    list(APPEND CMAKE_TRY_COMPILE_PLATFORM_VARIABLES
+        VCPKG_CRT_LINKAGE VCPKG_TARGET_ARCHITECTURE
+        VCPKG_C_FLAGS VCPKG_CXX_FLAGS
+        VCPKG_C_FLAGS_DEBUG VCPKG_CXX_FLAGS_DEBUG
+        VCPKG_C_FLAGS_RELEASE VCPKG_CXX_FLAGS_RELEASE
+        VCPKG_LINKER_FLAGS VCPKG_LINKER_FLAGS_RELEASE VCPKG_LINKER_FLAGS_DEBUG
+    )
+
+    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 "${EMSCRIPTEN_ROOT}/cmake/Modules/Platform/Emscripten.cmake")
+        message(FATAL_ERROR "Emscripten.cmake toolchain file not found")
+    endif()
+
+    include("${EMSCRIPTEN_ROOT}/cmake/Modules/Platform/Emscripten.cmake")
+
+    string(APPEND CMAKE_C_FLAGS_INIT " ${VCPKG_C_FLAGS} ")
+    string(APPEND CMAKE_CXX_FLAGS_INIT " ${VCPKG_CXX_FLAGS} ")
+    string(APPEND CMAKE_C_FLAGS_DEBUG_INIT " ${VCPKG_C_FLAGS_DEBUG} ")
+    string(APPEND CMAKE_CXX_FLAGS_DEBUG_INIT " ${VCPKG_CXX_FLAGS_DEBUG} ")
+    string(APPEND CMAKE_C_FLAGS_RELEASE_INIT " ${VCPKG_C_FLAGS_RELEASE} ")
+    string(APPEND CMAKE_CXX_FLAGS_RELEASE_INIT " ${VCPKG_CXX_FLAGS_RELEASE} ")
+
+    string(APPEND CMAKE_MODULE_LINKER_FLAGS_INIT " ${VCPKG_LINKER_FLAGS} ")
+    string(APPEND CMAKE_SHARED_LINKER_FLAGS_INIT " ${VCPKG_LINKER_FLAGS} ")
+    string(APPEND CMAKE_EXE_LINKER_FLAGS_INIT " ${VCPKG_LINKER_FLAGS} ")
+    string(APPEND CMAKE_MODULE_LINKER_FLAGS_DEBUG_INIT " ${VCPKG_LINKER_FLAGS_DEBUG} ")
+    string(APPEND CMAKE_SHARED_LINKER_FLAGS_DEBUG_INIT " ${VCPKG_LINKER_FLAGS_DEBUG} ")
+    string(APPEND CMAKE_EXE_LINKER_FLAGS_DEBUG_INIT " ${VCPKG_LINKER_FLAGS_DEBUG} ")
+    string(APPEND CMAKE_MODULE_LINKER_FLAGS_RELEASE_INIT " ${VCPKG_LINKER_FLAGS_RELEASE} ")
+    string(APPEND CMAKE_SHARED_LINKER_FLAGS_RELEASE_INIT " ${VCPKG_LINKER_FLAGS_RELEASE} ")
+    string(APPEND CMAKE_EXE_LINKER_FLAGS_RELEASE_INIT " ${VCPKG_LINKER_FLAGS_RELEASE} ")
+endif()
@@ -21,4 +21,7 @@ set(VCPKG_TARGET_ARCHITECTURE wasm32)
 set(VCPKG_CRT_LINKAGE dynamic)
 set(VCPKG_LIBRARY_LINKAGE static)
 set(VCPKG_CMAKE_SYSTEM_NAME Emscripten)
-set(VCPKG_CHAINLOAD_TOOLCHAIN_FILE "${EMSCRIPTEN_ROOT}/cmake/Modules/Platform/Emscripten.cmake")
+# Chainload vcpkg's wrapper toolchain rather than Emscripten.cmake directly:
+# the wrapper includes Emscripten.cmake and then applies VCPKG_C(XX)_FLAGS
+# and VCPKG_LINKER_FLAGS, which would otherwise be silently dropped.
+set(VCPKG_CHAINLOAD_TOOLCHAIN_FILE "${VCPKG_ROOT_DIR}/scripts/toolchains/emscripten.cmake")