[SOLVED] ZLib And QtCore

jpalbertini

Hi everyone,

I'm trying to build a static version of Qt 5.2 (developper, opensource, msvc2010, no exemples, no tests, OpenGL desktop), which i succeeded but when i try to link it with my application which use other frameworks, the build fail with a linker error:

Qt5Cored.lib(zutil.obj) : error LNK2005: _z_errmsg already defined in...

So i tried to use the -no-zlib switch but it does not seems no work as the Library is set to:
ZLIB support............qt

What can i do to remove this lib from qtcore ? I heard that the -system-zlib does not work on Windows so i haven't tried it yet ...

Thanks for the reply :)

patrik08

Hi .. can you post the full argument after configure?...
I know the QtCore need zlib for many section.. aka qCompress

grep -r "qCompress" *
corelib/tools/qbytearray.cpp: \fn QByteArray qCompress(const QByteArray& data, int compressionLevel)
corelib/tools/qbytearray.cpp:QByteArray qCompress(const uchar* data, int nbytes, int compressionLevel)
corelib/tools/qbytearray.cpp: qWarning("qCompress: Data is null");
corelib/tools/qbytearray.cpp: qWarning("qCompress: Z_MEM_ERROR: Not enough memory");
corelib/tools/qbytearray.cpp: This function will uncompress data compressed with qCompress()
corelib/tools/qbytearray.cpp: \sa qCompress()
corelib/tools/qbytearray.h:Q_CORE_EXPORT QByteArray qCompress(const uchar* data, int nbytes, int compressionLevel = -1);
corelib/tools/qbytearray.h:inline QByteArray qCompress(const QByteArray& data, int compressionLevel = -1)
corelib/tools/qbytearray.h:{ return qCompress(reinterpret_cast<const uchar *>(data.constData()), data.size(), compressionLevel); }
network/access/qnetworkdiskcache.cpp: are compressed using qCompress. Each cache file starts with "cache_"
network/access/qnetworkdiskcache.cpp: out << qCompress(data.data());
tools/rcc/rcc.cpp: qCompress(reinterpret_cast<uchar *>(data.data()), data.size(), m_compressLevel);

jpalbertini

Well I used the usual ones i think, from the wiki and other sources...
-developer-mode
-opensource
-platform win32-msvc2010
-static
-opengl desktop
-nomake examples
-nomake demos

patrik08

here i build static 5.1.1
qt-everywhere-opensource-src-5.1.1.tar.xz

on this way..
./configure -prefix /opt/icon/ -opensource -static -no-framework -no-xcb -release -silent
i need this only to build installer or small apps..
the best performance by qt apps is the shared lib variant...

MarianMMX

Method 1:
In the other framework, look for zutil.h and zutil.c .
Open those files, and rename z_errmsg to z_errmsg2 . Recompile.

Method 2 (not recommended):
Tell the compiler to ignore multiple definitions
@
cl /FORCE:MULTIPLE
@

jpalbertini

thx for your replies,

it worked fine with the 5.1.0 and 5.1.1 with the same options so i was hoping that it will be ok with the 5.2...

i see what i can do with the first method thx :)