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  1. Qt
  2. QTBUG-79547

[REG 5.13-5.14] CMake: Static Qt builds broken (missing Zlib)

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      I'm experiencing "Qt5::Zlib-NOTFOUND" errors when trying to compile CMake projects against WASM with Qt 5.14.0 Beta2. The same projects build fine with Qt 5.13.1.

      The problem might be related to "Qt5QTiffPlugin" (in lib/cmake/Qt5Gui/Qt5Gui_QTiffPlugin.cmake) now depending on Zlib in 5.14.0 Beta2, whereas it did not in 5.13.1. This new dependency is furthermore only present on WASM, and not on Windows. The "Qt5Zlib.a" binary does not seem to be included in the Qt WASM binaries, neither in the official binaries nor when building locally.

      Sample project to reproduce: https://github.com/forderud/QtWasm/tree/master/source (use "run_cmake.bat" if you want to use the Docker container). This project does not explicitly depend on "tiff"or zlib in any way.

      Build log extract:

      -- Configuring done
-- Generating done
-- Build files have been written to: /project/build
Scanning dependencies of target helloworld_autogen
[  6%] Automatic MOC for target helloworld
[  6%] Built target helloworld_autogen
CMakeFiles/helloworld.dir/build.make:300: *** target pattern contains no '%'.  Stop.
make[1]: *** [CMakeFiles/Makefile2:72: CMakeFiles/helloworld.dir/all] Error 2
make: *** [Makefile:84: all] Error 2

      Extract from CMakeFiles/helloworld.dir/build.make:

      line 298: helloworld.js: /usr/local/Qt-5.14.0/lib/libQt5FontDatabaseSupport.a
line 299: helloworld.js: /usr/local/Qt-5.14.0/lib/libQt5EglSupport.a
line 300: helloworld.js: Qt5::Zlib-NOTFOUND
line 301: helloworld.js: /usr/local/Qt-5.14.0/lib/libQt5EventDispatcherSupport.a
line 302: helloworld.js: /usr/local/Qt-5.14.0/lib/libQt5FontDatabaseSupport.a

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-78473 qtimageformats build failure for WebAssembly

          • P0: Blocker - MUST be fixed ASAP. This includes issues that prevent/block further Qt development; Legal issues & Serious data loss issues.
          • Closed
          For Gerrit Dashboard: QTBUG-79547
          # Subject Branch Project Status CR V
          283494,1 wasm: fix system zlib detection 5.14 qt/qtbase Status: ABANDONED -1 0
          296134,2 Fix linking of header only Qt5Zlib for cmake static builds 5.14 qt/qtbase Status: MERGED +2 0

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              kkohne Kai Köhne
              forderud Fredrik Orderud
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                Updated:
                Resolved:

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