[cmake-developers] CMake build with static crt and static QtDialog not linking

[Brad King]

On 2/16/2018 7:43 AM, Stuermer, Michael SP/HZA-ZSEP wrote:
> 1) The debug version crashes in

I don't know if we've ever built a debug configuration against this Qt.

> This application failed to start because it could not find or load
> the Qt platform plugin "windows" in "".

We statically link that plugin.  See our release build settings here:

  https://gitlab.kitware.com/cmake/cmake/blob/v3.11.0-rc1/Utilities/Release/win64_release.cmake

In particular, CMake_QT_STATIC_QWindowsIntegrationPlugin_LIBRARIES
in the initial cache file configures use of the static plugin.

> @brad: could you please provide a config.summary from the kitware Qt-build?
> Maybe I need to change the windows sdk version or so to fix my problem.

We use a custom environment to use the VS 2017 toolchain but still
support Windows XP:

```
Environment:
    INCLUDE=
      C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.11.25503\include
      C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.11.25503\atlmfc\include
      C:\Program Files (x86)\Windows Kits\10\include\10.0.10240.0\ucrt
      c:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\include
    LIB=
      C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.11.25503\atlmfc\lib\x64
      C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.11.25503\lib\x64
      C:\Program Files (x86)\Windows Kits\10\lib\10.0.10240.0\ucrt\x64
      c:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\lib\x64
    PATH=
      C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\VC\Tools\MSVC\14.11.25503\bin\HostX64\x64
      C:\Program Files (x86)\Windows Kits\10\bin\10.0.15063.0\x64
      C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\15.0\bin
      C:\Windows\Microsoft.NET\Framework64\v4.0.30319
      C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\IDE
      C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\Tools
      C:\Windows\system32
      C:\Windows
Configuration:
    pcre
    release
    compile_examples
    msvc_mp
Qt Configuration:
    minimal-config
    small-config
    medium-config
    large-config
    full-config
    release
    static
    static_runtime
    zlib
    no-gif
    jpeg
    png
    freetype
    audio-backend
    no-qml-debug
    directwrite
    native-gestures
    qpa
    concurrent

QMAKESPEC...................win32-msvc2017 (commandline)
Architecture................x86_64, features: sse sse2
Host Architecture...........x86_64, features: sse sse2
Maketool....................nmake
Debug.......................no
Force debug info............no
C++ language standard.......auto
Link Time Code Generation...no
Using PCH ..................no
Accessibility support.......no
RTTI support................yes
SSE2 support................yes
SSE3 support................yes
SSSE3 support...............yes
SSE4.1 support..............yes
SSE4.2 support..............yes
AVX support.................yes
AVX2 support................yes
NEON support................no
OpenGL support..............no
Large File support..........yes
NIS support.................no
Iconv support...............no
Evdev support...............no
Mtdev support...............no
Inotify support.............no
eventfd(7) support..........no
Glib support................no
CUPS support................no
OpenVG support..............no
SSL support.................no
OpenSSL support.............no
libproxy support............no
Qt D-Bus support............no
Qt Widgets module support...yes
Qt GUI module support.......yes
QML debugging...............no
DirectWrite support.........yes
Use system proxies..........no

QPA Backends:
    GDI.....................yes
    Direct2D................no

Third Party Libraries:
    ZLIB support............qt
    GIF support.............no
    JPEG support............yes
    PNG support.............yes
    FreeType support........yes
    Fontconfig support......no
    HarfBuzz support........no
    PCRE support............qt
    ICU support.............no
    ANGLE...................no
    Dynamic OpenGL..........no

Styles:
    Windows.................yes
    Windows XP..............yes
    Windows Vista...........yes
    Fusion..................yes
    Windows CE..............no
    Windows Mobile..........no

Sql Drivers:
    ODBC....................no
    MySQL...................no
    OCI.....................no
    PostgreSQL..............no
    TDS.....................no
    DB2.....................no
    SQLite..................no (qt)
    SQLite2.................no
    InterBase...............no
```

> I'm doing a temporary hack in QtDialog CMakeLists.txt at the moment to link to qtpcre:

That's due to the static library dependencies problem I mentioned previously.
See my earlier message about hacking _Qt5Core_LIB_DEPENDENCIES in Qt's files.

-Brad