libcommon | Library of reusable C++ code
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Library of reusable C++ code
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Trending Discussions on libcommon
QUESTION
I'm trying to build the following Dockerfile:
...ANSWER
Answered 2021-May-14 at 14:52Wow, this one is a tricky one. 🔎
When you build the container, the program which executes your instruction set is shell
(/bin/sh
) whereas when you run docker run -it --rm ubuntu:focal
, it is going to be run on bash
(/bin/bash
).
Basically, you manually ran all your instructions on bash
.
The easiest solution would be to use bash
to run your instruction set because it already works as you tested.
You can simply instruct the docker to run all your instructions on bash
using this command at the top:
QUESTION
I'm trying to add unit tests for some functions defined in this file:
My test file looks like this:
...ANSWER
Answered 2020-Dec-04 at 21:39You can solve by adding:
QUESTION
I want to use Pcap++ inside my Qt project. I've followed steps in the installation & introduction guide of PcapPlusPlus, but there are still unknowns:
- How do I implement that in my .pro file :
include ../../../Dist/mk/PcapPlusPlus.mk
- And that:
ANSWER
Answered 2020-Oct-02 at 18:27The idea is to convert the .mk to an appropriate code that qmake understands, for example in my case the .mk is:
QUESTION
I have an open-source game project that was mostly developed under Ubuntu. Recently I ported it to Windows, what consisted only in minor tweaks and then building it for Windows, since I only used cross-platform libraries and features.
To build it, initially I cross-compiled using MinGW-w64 from Ubuntu's 19.04 repositories, and it worked like a charm. This is what it reports as the version:
...ANSWER
Answered 2020-Sep-29 at 08:36After hanging out in mingw-w64 IRC channel, people there suggested me to open the executable in dependency tracker, which highlighted a big difference between the working and broken binaries: it looks like symbol requirements "leaked" from one DLL into another, unrelated, DLL.
What led people there to take a closer look into the DLL import libraries. In particular, I was linking against some DLLs via their MSVC generated import libraries, namely: glew32.lib
, OpenAL32.lib
and SDL2.lib
.
It seems GNU ld
has trouble handling import libraries from MSVC, and the fix was simply linking against the DLL files directly, in which case the symbol loading code is generated by ld
itself (and this is actually a much better supported operation: always link against the .dll directly if possible, import libraries are not needed in GNU toolchain).
I don't know why it worked before, apparently there was a regression in GNU ld
across the versions I used.
QUESTION
We have some very strange problem, program starts to hang out on boost::asio
library usage, called from our logging library builded on boost::log
.
That happens only if we link our library in (this library works just fine in any other our project). Program starts to work if we create boost::asio::ip::tcp::socket
object in initialization function of module, before log initialization, but it's not a decision of course. We also tried to add just array of same size, or more, but no, only socket object works.
GDB shows following:
...ANSWER
Answered 2020-Sep-25 at 22:48Well, that was really hard, but we determine problem. That was problem in glibc compatibility. Build machine was jessie with libc-23 and working machine was jessie with libc-19 (at least I think, that was a problem, may be other system libs). We debug that very hard, we try to compile all our libraries with same options (build machine for forked libraries build them with -O2 and our libraries with -O0), not helped.
But when we move from jessie to debian stretch on both build and running - all starts to work fine (both have libc-24). That was hard and long, cause we have many libraries, but, that solved the problem. Hope, you will never stack in such problem.
QUESTION
I am trying to add python bindings to a medium-sized C++ scientific code (some tens of thousands LOCs). I have managed to make it work without too many issues, but I have now incurred in an issue which I am incapable of solving myself. The code is organized as follows:
- All the classes and data structures are compiled in a library
libcommon.a
- Executables are created by linking this library
- pybind11 is used to create a
core.so
python module
The bindings for the "main" parts work fine. Indeed, simulations launched from the standalone code or from python give the exact same results.
However, the code also supports a plugin-like system which can load shared libraries at runtime. These shared libraries contain classes that inherit from interfaces defined in the main code. It turns out that if I try to link these shared libraries from python I get the infamous "undefined symbol" errors. I have checked that these symbols are in the core.so
module (using nm -D
). In fact, simulations that perform the dynamic linking with the standalone code works perfectly (within the same folder and with the same input). Somehow, the shared lib cannot find the right symbols when called through python, but it has no issues when loaded by the standalone code. I am using CMake to build the system.
What follows is a MCE. Copy each file in a folder, copy (or link) the pybind11
folder in the same place and use the following commands:
ANSWER
Answered 2020-Mar-25 at 03:17You are right, symbols from imported library are not visible because core
loaded without RTLD_GLOBAL
flag set. You can fix that with a couple of extra lines on python side:
QUESTION
How to docker build
from Dockerfile with more memory?
This is a different question from this Allow more memory when docker build a Dockerfile
When installing the software natively, there is enough memory to successfully build and install the marian
tool
But when building the Docker image using the Dockerfile
https://github.com/marian-nmt/marian/blob/master/scripts/docker/Dockerfile.cpu , it fails with multiple memory exhausted errors
ANSWER
Answered 2019-Aug-29 at 19:01It is not something about order. The Dockerfile must be specified with -f
QUESTION
There are several questions but no relevant answer yet. In my android studio project, I use several libraries with a different version. Now I facing error to run the project. I have some libraries with two different SDK version. One is sdk=25.3.1 and another is sdk=28.0.0 Here is my different build.gradle file.
...My Project build.gradle file
ANSWER
Answered 2019-Jun-10 at 12:25You have to set the config for all project in your build.gradle file
QUESTION
I wrote a bunch of small CUDA programs. Most of them compile fine in debug and release builds. However, a few fail when compiled in Release mode because various GCC intrinsics are being given the wrong types of pointers. But I'm not actually using intrinsics. This program partially reproduces my problem:
...ANSWER
Answered 2017-Jun-30 at 21:28It turns out that this is likely an nvcc
bug stemming from CUDA's stated lack of support for my particular system configuration. I filed a report here (you need to be logged in to see it).
For now, I worked around it by not using anything that requires intrinsics. In my case I used Thrust's random number generators instead of the standard library's. Someone I talked to suggested that I could also separate my host and device code more carefully such that the source files processed by nvcc
don't ever include . Haven't tried it but for those in the future who see this, it's worth a shot.
QUESTION
I'm trying to create a cryptocurrency with the CryptoNote Starter (cryptonotestarter.org), but get some errors when I try compiling (I think it uses cmake, make, and boost). Here are the errors:
...ANSWER
Answered 2019-Feb-11 at 18:04I believe I found a simple work-around, however I do not have a OSX machine to test it on.
- Open
hydro/CMakeLists.txt
- Change
set(C_WARNINGS "-Waggregate-return -Wnested-externs -Wold-style-definition -Wstrict-prototypes")
toset(C_WARNINGS "-Waggregate-return -Wnested-externs -Wold-style-definition -Wno-strict-prototypes")
- Run
cmake . && /Applications/Xcode.app/Contents/Developer/usr/bin/make
in thebuild/debug
directory
Or to disable -Werror
for everything
- Add
-Wno-error
to the END of the relevant (clang/c/c++)WARNINGS
variables inhydro/CMakeLists.txt
- Run
cmake .
inbuild/debug
- Run
make
as usual
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