Hello,
I am trying to compile a simple QT HelloWorld.cxx with cmake. I have a
statically compiled qt installed as well as a non static version.
What I want is a statically compiled HelloWorld. Cmake allows me to choose my
static build of QT (using cmake-gui) by choosing the qmake
binary in the static qt lib folder. When I do this it automatically changes the
other entries like QT_LIBRARY_DIR to the static version. Looks great
so far.
Here the problems begin though:
If I just generate my Makefile and make without adding CMAKE_EXE_LINKER_FLAGS
"-static", everything seems to work and my HelloWorld binary ist beeing
created. ldd reveals though that it has been linked against the shared version
of the lib:
> ldd ./HelloWorld
> libQtGui.so.4 => /usr/lib/libQtGui.so.4 (0x00110000)
> ...
> ...
This struck me as strange, as all entries in my generated CMakeCache.txt point
to my static install of QT which certanly is nowhere near /usr/lib (in /usr/lib
my nonstatic qt is installed). The result is, I have compiled a working
HelloWorld binary which is linked against my nonstatic version of QT which
cmake shouldn t even know about after changing the qmake binary path in the
cmake configure process.
This is not the real problem though, since I want to compile it with
CMAKE_EXE_LINKER_FLAGS "-static". If I generate my Makefile with -static
option, make throws the following linker error:
canning dependencies of target HelloWorld
[100%] Building CXX object CMakeFiles/HelloWorld.dir/HelloWorld.cxx.o
Linking CXX executable HelloWorld
/usr/bin/ld: cannot find -lQtGui
collect2: ld returned 1 exit status
make[2]: *** [HelloWorld] Error 1
make[1]: *** [CMakeFiles/HelloWorld.dir/all] Error 2
make: *** [all] Error 2
Somehow the linker cannot find the QtGui module, which is in my statically
compiled folder of QT under lib/libQtGui.a.
Any ideas/solutions? I really have no idea at this point since everything looks
fine in the cmake config/generation process.
My CMakeLists.txt looks like this:
PROJECT(HelloWorld)
cmake_minimum_required(VERSION 2.6)
FIND_PACKAGE(Qt4)
IF(QT4_FOUND)
INCLUDE(${QT_USE_FILE})
ELSE(QT4_FOUND)
MESSAGE(FATAL_ERROR
"Qt4 not found. Please set QT4_DIR.")
ENDIF(QT4_FOUND)
ADD_EXECUTABLE(HelloWorld HelloWorld.cxx )
TARGET_LINK_LIBRARIES(HelloWorld QtGui)
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