[Interest] Compiling Qt5 on Windows fails with Project Warning

[Philipp Berger]

Hey everybody,

I am currently trying to "upgrade" to Qt5 and stumbled on a problem
while building. But, step by step. I started off by unzipping the
qt-everywhere-opensource-src-5.0.0.zip to an empty folder, fired up a
CMD with all Paths set for MSVC 2012 x64 Native, Ruby and Perl/Python
and configured for a Debug-Build with:
configure.bat -prefix D:/Qt/qt5-debug-shared -debug -opensource -shared
-no-ltcg -no-fast -nomake examples -accessibility -qt-sql-sqlite
-qt-sql-mysql -opengl desktop -platform win32-msvc2012 -qt-zlib -qt-pcre
-icu -qt-libpng -qt-libjpeg -vcproj -incredibuild-xge -plugin-manifests
-qmake -fully-process -rtti -sse2 -sse3 -ssse3 -sse4.1 -sse4.2 -avx
-openssl-linked -mp -confirm-license -I
"D:\Qt\sqlite-amalgamation-3071502" -I "D:\Qt\openssl-build\include" -L
"D:\Qt\openssl-build\lib" -I
"D:\mysql-connector-c-6.0.2\installDir\include" -L
"D:\mysql-connector-c-6.0.2\installDir\lib" -l libmysql -I
"D:\icu\include" -L "D:\icu\lib64"

After that finished, "nmake" started, compiled - everything works.

Now I wanted to create a second build in Release Configuration. So, once
again - empty folder, zip, new CMD. Configure for Release:
configure.bat -prefix D:/Qt/qt5-r-st -release -opensource -static
-ltcg    -no-fast -nomake examples -accessibility -qt-sql-sqlite
-qt-sql-mysql -opengl desktop -platform win32-msvc2012 -qt-zlib -qt-pcre
-icu -qt-libpng -qt-libjpeg -vcproj -incredibuild-xge -plugin-manifests
-qmake -fully-process -rtti -sse2 -sse3 -ssse3 -sse4.1 -sse4.2 -avx
-openssl-linked -mp -confirm-license -I
"D:\Qt\sqlite-amalgamation-3071502" -I "D:\Qt\openssl-build\include" -L
"D:\Qt\openssl-build\lib" -I
"D:\mysql-connector-c-6.0.2\installDir\include" -L
"D:\mysql-connector-c-6.0.2\installDir\lib" -l libmysql -I
"D:\icu\include" -L "D:\icu\lib64"

The configure process now says:

Project WARNING: Plugin class name could not be determined for qwindows
plugin.

What does that mean? I tried many things, over and over again, and I
have no idea left.

Cheers,
Philipp

P.S.: Even though I can run nmake and compile, the resulting
applications all crash with "Failed to load platform plugin "windows".
Available platforms are: "

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