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Trying to get started with WASM preview

  • I am following the instructions found here: but cannot get my QtWidget hello world application to compile on OS X. Below are the complete steps I went through for set up:

    $ git clone git:// && cd qt5
    $ perl init-repository
    $ ./configure -xplatform wasm-emscripten -nomake examples -prefix $PWD/qtbase
    $ make module-qtbase module-qtdeclarative

    At this point I switched to my application directory where qmake succeeded and make failed:
    $ ~/qt5/qtbase/bin/qmake && make
    emcc: warning: cannot represent a NaN literal '0x7feef7a6e3c0' with custom bit pattern in NaN-canonicalizing JS engines (e.g. Firefox and Safari) without erasing bits!
    in ret double 0x7FF4000000000000 in _ZL7qt_snanv.14706()
    error: undefined symbol: FT_Done_Face
    warning: To disable errors for undefined symbols use -s ERROR_ON_UNDEFINED_SYMBOLS=0
    error: undefined symbol: FT_Done_FreeType
    error: undefined symbol: FT_Get_Char_Index
    error: undefined symbol: hb_blob_create
    error: undefined symbol: hb_blob_get_empty
    error: undefined symbol: png_create_info_struct
    error: undefined symbol: png_create_read_struct

    So what's missing?

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