# WebAssembly (Emscripten) toolchain hook.
#
# Used by the `wasm` configure preset to chain-load the real Emscripten
# toolchain from the active EMSDK. Phase 0 builds only the hello-world target
# in wasm/ (Rule R5 — never blocks shipping). Phase 2 will compile the full
# engine (PDFium + Skia + FreeType + HarfBuzz) through this same toolchain.

if(NOT DEFINED ENV{EMSDK})
    message(FATAL_ERROR
        "WASM build requested but EMSDK is not set in the environment.\n"
        "Install and activate the Emscripten SDK:\n"
        "    git clone https://github.com/emscripten-core/emsdk\n"
        "    ./emsdk install latest && ./emsdk activate latest\n"
        "    source ./emsdk_env.sh   (or emsdk_env.bat on Windows)\n"
        "Then re-run: cmake --preset wasm")
endif()

set(_emscripten_toolchain
    "$ENV{EMSDK}/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake")

if(NOT EXISTS "${_emscripten_toolchain}")
    message(FATAL_ERROR "Emscripten toolchain not found at: ${_emscripten_toolchain}")
endif()

include("${_emscripten_toolchain}")

# Engine blueprint §6.3: large PDFs can exceed the default WASM heap.
set(CMAKE_EXE_LINKER_FLAGS_INIT "-sALLOW_MEMORY_GROWTH=1")