I need to install the real time proccess library "rtaudio-4.1.1" on windows in order to use it in C++ projet.
I'd try to compile the library project given by MIT website with QTCreator. I opened the qt project RTaudio and click on compile and the output is:
In function `newDrvStruct` (in asiolist.o):
undefined reference to `_imp__CLSIDFromString#8' in asiolist.cpp
In function `ZN14AsioDriverListC2Ev` (in asiolist.o):
undefined reference to `_imp__CoInitialize#4' in asiolist.cpp
Some research on the subject leads me to accuse the linker configuration but I didn't know very well what's the problem and how to solve it. :'(
So, i'm calling you to give me some hope !
Thanks by advance ! =)
The "ole32.dll" lib is missing. Try to add this to your .pro file:
LIBS += -lole32 -lwinmm -luuid -lksuser
Related
I need to compile the rtree extension for SQLite from source code. The readme includes these instructions:
The easiest way to compile and use the RTREE extension is to build
and use it as a dynamically loadable SQLite extension. To do this
using gcc on *nix:
gcc -shared rtree.c -o libSqliteRtree.so
You may need to add "-I" flags so that gcc can find sqlite3ext.h
and sqlite3.h. The resulting shared lib, libSqliteRtree.so, may be
loaded into sqlite in the same way as any other dynamicly loadable
extension.
Problem I'm having is that I'm on Windows, not Linux, and so need to use MSVC. I tried:
cl rtree.c -link -out:libSqliteRtree.so
This gave cannot open include file errors until I found the various .h files it was complaining about and moved them into the same directory. Now, however, it's gotten to:
/out:rtree.exe
-out:libSqliteRtree.so
rtree.obj
Creating library libSqliteRtree.lib and object libSqliteRtree.exp
LINK : fatal error LNK1561: entry point must be defined
I admit I have pretty much zero clue what I'm doing in a compiler, and I'm not sure where to go from here to resolve its problem. Am I "translating" the compiler flags correctly from GCC to MSVC? What else can I tweak to try to get the SQLite extension out of the source code? Should I beg a favor from a developer on ateam with a Linux server and ask them to do it for me?
Thanks to Shawn for commenting to look at the SQLite Run-Time Loadable Extensions documentation, which had more information in it:
To compile on Windows using MSVC, a command similar to the following will usually work:
cl YourCode.c -link -dll -out:YourCode.dll
So for my situation: cl rtree.c -link -dll -out:libSqliteRtree.dll worked.
I'm using Qt Creator 4.11.0-beta2 (4.10.83) in a project.
Wanted to add CUPS for printing abilities.
Added library libcups.a in the projects *.pro file :
LIBS += \ /usr/lib/x86_64-linux-gnu/libcups.a
When linking I get the error.
:-1: error: /usr/lib/x86_64-linux-gnu/libcups.a(file.o): undefined reference to symbol 'inflateEnd'
Investigations indicate the problem lies in the dependence zlib1g (>=1:1.2.0)
(I have version zlib1g 1:1.2.11.dfsg-1+b1)
Someone (google) has suggested it happens because linker try to use libzip instead of zlib
I do not know how to solve this problem.
I just freshly installed Qt Creator 4.1.0
Based on Qt 5.7.0 (GCC 4.9.1 20140922 (Red Hat 4.9.1-10), 64 bit)
This error drives me crazy after I fixed all kit errors, actually I spent some time on google looking for proper compiler. This could be something with compiler version I think:
/usr/include/c++/5.3.1/cstddef:45: error: stddef.h: No such file or
directory
I saw solutions for windows everywhere but could not find for linux, does anyone has experience how to fix it?
Screenshots
rpm -qa | grep devel | sort
expat-devel-2.1.0-10.fc22.x86_64
fontconfig-devel-2.11.94-4.fc22.x86_64
freetype-devel-2.5.5-2.fc22.x86_64
gdbm-devel-1.11-4.fc22.x86_64
glibc-devel-2.21-13.fc22.i686
glibc-devel-2.21-13.fc22.x86_64
java-1.8.0-openjdk-devel-1.8.0.65-3.b17.fc22.x86_64
kernel-debug-devel-4.2.5-201.fc22.x86_64
kernel-debug-devel-4.2.6-200.fc22.x86_64
kernel-devel-4.2.6-200.fc22.x86_64
libdb-devel-5.3.28-12.fc22.x86_64
libdrm-devel-2.4.61-3.fc22.x86_64
libICE-devel-1.0.9-2.fc22.x86_64
libpng-devel-1.6.16-3.fc22.x86_64
libSM-devel-1.2.2-2.fc22.x86_64
libstdc++-devel-5.3.1-6.fc22.i686
libstdc++-devel-5.3.1-6.fc22.x86_64
libXau-devel-1.0.8-4.fc22.x86_64
libxcb-devel-1.11-8.fc22.x86_64
libXcursor-devel-1.1.14-4.fc22.x86_64
libXdamage-devel-1.1.4-6.fc22.x86_64
libXext-devel-1.3.3-2.fc22.x86_64
libXfixes-devel-5.0.1-4.fc22.x86_64
libXft-devel-2.3.2-2.fc22.x86_64
libXi-devel-1.7.4-2.fc22.x86_64
libXinerama-devel-1.1.3-4.fc22.x86_64
libXrandr-devel-1.4.2-2.fc22.x86_64
libXrender-devel-0.9.9-1.fc22.x86_64
libxshmfence-devel-1.2-1.fc22.x86_64
libXt-devel-1.1.4-10.fc22.x86_64
libXv-devel-1.0.10-2.fc22.x86_64
libXxf86vm-devel-1.1.4-1.fc22.x86_64
libX11-devel-1.6.3-1.fc22.x86_64
mesa-libGL-devel-10.6.9-1.20151008.fc22.x86_64
mesa-libGLU-devel-9.0.0-7.fc22.x86_64
perl-devel-5.20.3-328.fc22.x86_64
python3-devel-3.4.2-6.fc22.x86_64
qt-devel-4.8.7-4.fc22.x86_64
systemtap-devel-2.9-1.fc22.x86_64
systemtap-sdt-devel-2.9-1.fc22.x86_64
xorg-x11-proto-devel-7.7-12.fc21.noarch
zlib-devel-1.2.8-7.fc22.x86_64
I had this problem as well, and for me I had to disable ClangCodeModel plugin. To do this, I went to Help->About Plugins...->Uncheck ClangCodeModel (under C++ category). After restarting QT Creator, everything was working fine. I found this solution on QT Forums
If the compiler works from a terminal, it should work from QtCreator. So first make it work from the terminal.
From a terminal, create a file main.cpp with:
#include <cstddef>
int main()
{
return 0;
}
Then type the command:
gcc -H main.cpp -o main
If the compilation works, there must be a problem in your kit definition in QtCreator. Possibly make sure the folder where stddef.h is in the include file list of your kit. But you should not need to do that. Temporarily, you can add the include path to your project (see How to add include path in Qt Creator?) to check this is really the problem. Then you'll need to find a way to fix the kit for good.
If the compilation does not work, fix your environment (possibly using sashoalm's commented link). QtCreator is just and IDE, if you run it with a broken compiler it won't fix it for you. The compilation output will show where files (cstddef and then stddef.h) are picked from (-H option). Try cpp -v to see where included files are searched.
On my machine, compilation output gives me:
. /usr/include/c++/4.8/cstddef ..
/usr/include/x86_64-linux-gnu/c++/4.8/bits/c++config.h ...
/usr/include/x86_64-linux-gnu/c++/4.8/bits/os_defines.h ....
/usr/include/features.h .....
/usr/include/x86_64-linux-gnu/sys/cdefs.h ......
/usr/include/x86_64-linux-gnu/bits/wordsize.h .....
/usr/include/x86_64-linux-gnu/gnu/stubs.h ......
/usr/include/x86_64-linux-gnu/gnu/stubs-64.h ...
/usr/include/x86_64-linux-gnu/c++/4.8/bits/cpu_defines.h ..
/usr/lib/gcc/x86_64-linux-gnu/4.8/include/stddef.h Multiple include
guards may be useful for: /usr/include/c++/4.8/cstddef
/usr/include/x86_64-linux-gnu/bits/wordsize.h
/usr/include/x86_64-linux-gnu/gnu/stubs-64.h
/usr/include/x86_64-linux-gnu/gnu/stubs.h
/usr/lib/gcc/x86_64-linux-gnu/4.8/include/stddef.h
see stddef.h was found in /usr/lib/gcc/x86_64-linux-gnu/4.8/include
And cpp -v gives:
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/x86_64-linux-gnu/4.8/include
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/4.8/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
Note: If you created the kit manually, I would recommend that you uninstall QtCreator. Make gcc work from a terminal and then reinstall QtCreator. This one should create the kits automatically and they should then work.
This is a common problem with QT I experience a lot with all versions of Fedora, the problem is that the path to "/usr/lib64/qt5/bin" is missing from the user environment.
To check for the path at a command line what the path is present set to enter the following: echo $PATH
You should see the "/usr/lib64/qt5/bin" listed somewhere in the response if it is not present then edit the .bashrc file in the root of your home directory as follows: -
Add QT5 build environment
if! [[ "$PATH" =~ "/usr/lib64/qt5/bin" ]]
then
PATH="/usr/lib64/qt5/bin:$PATH"
fi
Just above the "export PATH" statement
You will need to log off and on again for the changes to take effect.
I created a C++ library project in Qt creator. After building the project I have the libMylib.so, .so.1, .so.1.0, .so.1.0.0, Makefile and mylib.o files. I added the library headers to my other project and added the path to my .pro file like this:
LIBS += "/home/peter/Workspace/build-Libtester-Desktop-Release/libMyLib.so"
When building the application I don't get no such file error, but when running it I get this:
/home/peter/Workspace/build-Libtester-Desktop-Debug/Libtester: error while loading shared libraries: libMyLib.so.1: cannot open shared object file: No such file or directory
which I can't understand, because it's right there next to the .so which it seem to find, because when the path is wrong I get a no such file or directory error when trying to build the project.
Could someone explain what I'm missing here?
Thanks for your time.
Fortunately, your problem has nothing to do with both Qt and Qt Creator. The error simply boils down to how shared libraries are searched by LD for dynamic linking on Unix OS family.
Today, I've answered similar question, have a look, please. This question was asked in regard to Mac OS X. However, Linux and Mac OS X are the same in the context of your problem. I've provided additional explanation for Linux at the bottom, so pay attention to it. "it's right there next to the .so" - you seem to have Windows background if you make this assumption, but it is wrong for Unix OS family altogether (as stated in the answer too). If you have further questions, just ask.
You are adding the library incorrectly. You are doing:
LIBS += "/home/peter/Workspace/build-Libtester-Desktop-Release/libMyLib.so"
instead of:
LIBS += -L"/home/peter/Workspace/build-Libtester-Desktop-Release" -lMyLib
The first version works on windows, but not linux.
Basically, you create a library, which will be named "libMyLib.so", and then you specify the path to its folder, prepended by "-L" and then do "-lMyLib" at the end, note that it's not "-llibMyLib", but just "-lMyLib", despite the fact that the .so name is "libMyLib".
Look here: https://wiki.qt.io/How_to_create_a_library_with_Qt_and_use_it_in_an_application for more info.
I am getting linker failures under MinGW, however I cannot see why. This is the link command:
g++ -shared -mthreads
-Wl,--out-implib,C:\Users\camm\Syren\libs\libSy_polyMesh.a -o C:\Users\camm\Syren\libs\Sy_polyMesh.dll debug/Sy_polyMesh.o
debug/moc_Sy_polyMesh.o debug/qrc_Sy_polyMesh.o -L"c:\Qt\4.8.4\lib"
-lglu32 -lopengl32 -lgdi32 -luser32 -LC:\Users\camm\Syren/libs -lSyren -lglew32 -lboost_system -lQtSvgd4 -lQtSqld4 -lQtOpenGLd4 -lQtGuid4 -lQtCored4
The undefined reference errors come from the Syren dll (I should state the command was automatically generated by qmake). The -LC:\Users\camm\Syren/libs looks malformed to me because of the mix of forward and backslashes, but if I manually set them to all one way or the other - it does not change the compiler output.
I had earlier problems with 3rd party libraries I needed (GLEW and Boost specifically), but because they were relatively 'constant' I didn't have a problem putting them in my C:\MinGW\lib directory. But that is really not an option for my plugins.
What I find is that the MinGW docs state in a few locations:
...since suitable search paths may always be specified using -L
options.
...but that GCC itself furnishes the effective defaults, by supplying
appropriate -L options.
However, C:\Users\camm\Syren\libs is where Syren.dll resides!
Edit: Here are the LIBS declarations in my .pro file:
LIBS += -L$(SYREN_PATH)/libs \
-lSyren
win32 {
LIBS += -lglew32 \
-lboost_system
}
And $(SYREN_PATH) expands to C:\Users\camm\Syren. Also I can see to the 'missing' symbols in Syren.dll, for example:
C:\Users\camm\Documents\Syren\Sy_polyMesh_debug/../Sy_polyMesh/src/Sy_polyMesh.cpp:341:
undefined reference to `Sy_GLBuffer::unbind()'
Can be seen listed as:
6c500bd6 T _ZN11Sy_GLBuffer6unbindEv
Edit2
After adding a verbose flag to the linker stage I noticed that the linker was iterating through each search path and then through each library naming convention, and using the first one it could open.
attempt to open C:\Users\camm\Syren/libs/libSyren.dll.a failed
attempt to open C:\Users\camm\Syren/libs/Syren.dll.a failed
attempt to open C:\Users\camm\Syren/libs/libSyren.a succeeded
Hypothesizing that the libSyren.a may be broken, I renamed it to force the linker to use the .dll:
attempt to open C:\Users\camm\Syren/libs/libSyren.dll.a failed
attempt to open C:\Users\camm\Syren/libs/Syren.dll.a failed
attempt to open C:\Users\camm\Syren/libs/libSyren.a failed
attempt to open C:\Users\camm\Syren/libs/Syren.lib failed
attempt to open C:\Users\camm\Syren/libs/libSyren.dll failed
attempt to open C:\Users\camm\Syren/libs/Syren.dll succeeded
But I still get exactly the same error messages!
If you are linking the right DLL and the linker isn't complaining about a missing file, the dll might be missing exports to allow linking.
The MinGW linker can link directly to a DLL if it properly exports the symbols, although it is still recommended to link to the import library (which should be created in a qmake build) which is named lib*.a or lib*.dll.a. I believe the linker looks for variants with and without the libprefix, but I am unsure and should test this myself.
You can check what symbols a DLL exports by using objdump and/or nm.
If the linker doesn't complain about not being able to load Syren dll, it means that the file is correctly loaded... The symbols are just missing into the Syren dll (not exported ?)... Why it's hard to tell without more information
When you built the Syren lib, did you have any warning about missing prototypes ?
What is used by Syren lib, nothing not portable or requiring a Windows dll ?
Could you give the list of missing symbols ?
Edit : How do you compile the Syren.dll ? Did you use Mingw ? What option did you pass to the compiler / linker ?
I suggest to read these 2 links :
http://www.mingw.org/wiki/sampleDLL
http://www.mingw.org/wiki/CreateImportLibraries
If you are exporting C++ function you must use the same compiler between the program and the DLL. Or you could use a C-style wrapper functions to encapsulate the C++ ABI.
A very good article about this subject : http://www.codeproject.com/Articles/28969/HowTo-Export-C-classes-from-a-DLL
What happens when you replace $(SYREN_PATH) with $${SYREN_PATH}?
Because the former notation $() means the contents of an environment variable at the time Makefile is executed.
See the qmake variable reference.