Wrong path causes link error

I'm encountering a very strange error while compiling Qt5 for 32 bit system. QtWebkit won't compile with a message from assembler. I've never seen such errors before. That seems not to be a compiler nor linker error

Configure script is like this:

configure -debug-and-release -opensource -no-c++11 -shared -no-ltcg -nomake examples -nomake tests -accessibility -qt-sql-mysql -qt-sql-sqlite -qt-sql-odbc -opengl desktop -iconv -inotify -fontconfig -system-proxies -qt-zlib -qt-pcre -icu -qt-libpng -qt-libjpeg -qt-freetype -no-angle -plugin-manifests -qmake -rtti -strip -sse2 -sse3 -sse4.1 -sse4.2 -avx -avx2 -openssl -dbus-linked -audio-backend -native-gestures -prefix E:\qt_5.0.0

and the error:

mingw32-make[2]: Entering directory 'E:/sources/qt-everywhere-opensource-src-5.0.0/qtwebkit/Source/WebKit'
g++ -c {blah blah blah blah} -o .obj\debug_shared\qhttpheader.o qt\Api\qhttpheader.cpp
Assembler messages:
Fatal error: can't create .objdebug_shared\qhttpheader.o: No such file or directory
qt\Api\qhttpheader.cpp:272:1: fatal error: error writing to -: No error
compilation terminated.}}

I think that's because of a forgotten \ in .objdebug_shared which should be .obj\debug_shared . I do a mkdir ./.objdebug_shared in qtwebkit/Source/WebKit and compile continues. Then new errors occur that say cannot find .o objects in .obj\debug_shared . I have to copy contents of .objdebug_shared to .obj\debug_shared several time to get it compiled.

There should be something wrong with the script that generates makefile and write output path in it. (perl or qmake?)

Complete output is attached