I'm working in a project which uses ROS and WebRTC.
To build both libraries, I have to define "WEBRTC_POSIX" and "_GLIBCXX_USE_CXX11_ABI=0".
However, when I add "_GLIB_CXX_USE_CXX11_ABI=0" definition to compiler, I get unsatisfied link errors from ROS.
I'm using Ubuntu 17.04, ROS Lunar, g++ 6.3 and cmake 3.7.2
Is there any trouble with ROS and std=c++11?
I had this same issue. Ultimately what I found is that you probably need to use Ubuntu 14.04 and ROS Indigo to have to compile cleanly. The ROS comms don't change too often, so you may be able to run this node on a separate PC or VM.
I tried to make it work, but ultimately you have to build all of ROS and replace a lot of the Ubuntu system libraries with custom built versions that have the flag set.
I made it as far as a ROS source install + a custom Boost version. I gave up when I had to add Log4Cxx. If I remember correctly, there's a few other dependencies too that you'd need to compile.
Related
In order to use nzmqt on Qt5 (Windows) I downloaded and compiled ZeroMQ 3.2.5 as described on GitHub. My Qt5 application compiles fine but it doesn't run: it complains about the entry point of libstdc++-6.dll.
I guess it's due to the different version of MinGW used to compile ZeroMQ (the one included in the RubyDevKit) and my application.
Thus, I'm trying to compile ZeroMQ with the MinGW which comes with Qt5... Unfortunately it's not enough to run mingw32-make from the Qt5 folders because it doesn't accept the "fail" command in the Makefile:
$(RECURSIVE_TARGETS):
#fail= failcom='exit 1'; \
This is beyond my knowledge.
I'm wondering if anyone was able to use nzmqt with ZeroMQ 3.2.5 under Windows and Qt5.
I am trying to build and use a piece of C++ code that uses OpenCV. I am working on Linux, working in Code::Blocks (and the code was originally also developed on a Linux platform using C::B).
I followed this to install OpenCV (Ubuntu 12.04 & OpenCV 2.4.3). The project compiles fine, but when I try to execute it, it crashes on launch, with the following message about how it can not find the library:
(file_address): error while loading shared libraries: libopencv_core.so.2.3:
cannot open shared object file: No such file or directory
Process returned 127 (0x7F) execution time : 0.017 s Press ENTER to continue.
I set all the parameters for the linker according to several Code::Blocks install tutorials.
I also checked in /usr/local/lib/ for my libraries (it is the folder I gave to Code::Blocks' compiler); and while I do have a libopencv_core.so, a libopencv_core.so.2.4 and a libopencv_core.2.4.3, I do not have a libopencv_core.so.2.3.
So I'm wondering what the issue is. Is it about backwards compatibility, i.e. do I have to install the exact same version of OpenCV used to develop the original code? (This would be a bit concerning, since I am trying to make a widely-usable library).
Could I force it to use libopencv_core.so.2.4 instead?
EDIT: I managed to make it work by removing everything and reinstalling with a simple apt-get. Sometimes it's the simplest method that works the best! From now on I'll try to apt-get before following installation tutorials. ;)
Have a nice day!
I regularly use Code::Blocks and MinGW for my C/C++ projects. I would like to be able to use OpenCV, since it has a nice library for computer vision projects. They have dropped support for MinGW. I have heard you can build it on your own somehow, but I have no experience doing this with 3rd party libraries. Can someone explain how to build it in a simple way for MinGW?
There is, or at least there was at least until 2.4.6, precompiled version of opencv that works out of the box with mingw as long as you use the dw2(standard) version of mingw.
since i needed sjlj support i had to build my own version of openCV 2.4.6
I did he following - i am pretty sure it will work for the current openCV version as well
Setup your preferred Mingw Environment - i would strongly recommend to use gcc 4.5 or newer
Intstall Msys
Intall Cmake - you can get a binary package
Start the Cmake GUI
Select the openCV source folder
Click Configure and select MSYS-Makfiles
Errors in the first run of Configure might be resolved if you run Configure again
Click Generate
use MSYS make to run the generated makefile
Copy all desired libraries and include files to your mingw-installation or your project
I have an Eclipse project that I want to compile on both Ubuntu and Windows.
I am using boost libraries (specifically asio) which require including the libboost_system...* library. I have compiled boost on both Windows and Ubuntu and ended up with libboost_system_mgw48-mt-1_55.a on Windows and libboost_system.a, libboost_system.so, libboost_system.so.1.55.0 on Ubuntu.
I'm not sure which Ubuntu library I need to include but the bigger issue is how to include both the Windows and Ubuntu library but only on the right OS.
I am using the MinGW toolchain on Windows which by my understanding is more or less GCC? I am then assuming that I should simply use GCC on Ubuntu to have the same compile process.
Windows boost build commands:
bootstrap.bat mingw
b2 toolset=gcc
Ubuntu boost build commands:
bootstrap.sh
b2
Can Eclipse get the OS in use on a per install basis that I can access via a globally recognizable variable?
How can I then, assuming yes, use that information to conditionally include only the right libraries?
The solution I came up with was to use two configurations: Debug-Win32 and Debug-Unix in the project properties. This keeps track of independent library & path configurations as well as different tool chains while still pulling from the same code base.
I am new to both Qt and Linux C++ development (although I have many years C and C++ development experience on Windows).
I have some legacy C projects (source files and headers - [not using Qt]) that I want to compile into shared libs on Linux.
I am proposing to store my projects under the following structure:
/home/username/Projects/project_name
/home/username/Projects/project_name/src
/home/username/Projects/project_name/build
Can anyone tell me how to do the following (using Qt to simplify the build process)
Create different build configurations (debug, release etc)
Build a configuration to create the appropriate shared library
As an aside, I have only recently installed Ubuntu 9.10 and the only C/C++ development tool I have installed (using SPM) in Qt - so I dont know if I need to install some other GNU C++ tools.
BTW I have already checked and have gcc (v4.4.1) available on my machine. I do not appear to have g++ though - I do not know whether this is significant or not.
An Ubuntu system doesn't come with build tool chain by default. Instead it has a meta package that you will need to install:
sudo apt-get install build-essential
This will install, among other the g++ compiler, although I am not sure about the Qt headers an such. For them you will need the qt4-dev package (I assume you wish to work with qt4 rather then qt3).
As for the bould structure, you will want to consult the qmake manual, or you might want to consider using CMake (apt-get install cmake) instead. CMake allow for out of build sources, as you require, and personally, I can't recommend it enough.