QtWebApp | HTTP server library in C++ , based on Qt Framework | HTTP library

by fffaraz C++ Version: v1.8.6 License: LGPL-3.0

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kandi X-RAY | QtWebApp Summary

QtWebApp is a C++ library typically used in Networking, HTTP applications. QtWebApp has no bugs, it has no vulnerabilities, it has a Weak Copyleft License and it has low support. You can download it from GitHub.

Fork from Stefan's QtWebApp: QtWepApp is a HTTP server library in C++, inspired by Java Servlets. For Linux, Windows, Mac OS and many other operating systems that the Qt Framework supports.

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QtWebApp has a low active ecosystem.

It has 116 star(s) with 61 fork(s). There are 10 watchers for this library.

It had no major release in the last 12 months.

There are 0 open issues and 3 have been closed. On average issues are closed in 120 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of QtWebApp is v1.8.6

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QtWebApp has no bugs reported.

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QtWebApp has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

QtWebApp is licensed under the LGPL-3.0 License. This license is Weak Copyleft.

Weak Copyleft licenses have some restrictions, but you can use them in commercial projects.

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QtWebApp releases are available to install and integrate.

Installation instructions are not available. Examples and code snippets are available.

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unresolved std::__cxx11::basic_string::~basic_string and std::allocator::~allocator() symbols

QUESTION

unresolved std::__cxx11::basic_string::~basic_string and std::allocator::~allocator() symbols

Asked 2019-Aug-18 at 08:09

I am trying to compile QtWebApp with Qt5.5.1 onto the latest RPI4-Raspbian Buster and I am encountering inexplicable GLIBCXX unresolved symbols

What Works : QtWebApp cross compiled from windows to armhf using qt5.5.1 binaries natively compiled on Raspbian Buster works fine with the following components

Toolchain : raspberry-gcc8.3.0.exe installed on Windows 10.
Qt Binary Libs : Native compiled on RPI4 Raspbian Buster OS and copied over to Windows 10.
Command line : c:/SysGCC/raspberry/bin/arm-linux-gnueabihf-g++.exe -std=c++11 -fPIC -I. {ALL QT INCLUDE DIRS} -IC:/SysGCC/raspberry/arm-linux-gnueabihf/sysroot/opt/vc/include -g -rdynamic -funwind-tables -Woverflow {ALL QTWEB SOURCE FILES} -LC:/SysGCC/pi4/pi4qt551/lib -lQt5Core -lQt5Gui -lQt5Widgets -lQt5Multimedia -lQt5MultimediaWidgets -lQt5Network -lm -lpthread -o qtweb

This produces an arm executable that worksfine on RPI-4.

What fails

When compiling natively (which is what I want as the development env) on RPI4 the compilation strangely fails with the following error :

/usr/bin/ld: /tmp/ccnnsRCD.o: undefined reference to symbol '_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED1Ev@@GLIBCXX_3.4.21'

What I have tried (didnt work)

1) Following suggestions from Converting std::__cxx11::string to std::string and passing -D_GLIBCXX_USE_CXX11_ABI=0 it fails with the following error :

/usr/bin/ld: /tmp/ccZfI5co.o: undefined reference to symbol '_ZNSaIcED1Ev@@GLIBCXX_3.4'

where those symbol demangles to std::__cxx11::basic_string, std::allocator >::~basic_string() and std::allocator::~allocator() respectively.

2) I also ran all the combinations WITH/WITHOUT -std=c++11 and D_GLIBCXX_USE_CXX11_ABI=0 and these are the errors

...

ANSWER

Answered 2019-Aug-18 at 08:09

Are you executing the compiler as gcc instead of g++? That would cause this problem. Invoke g++.
Otherwise, Try adding -lstdc++ to your link flags.

Explanation:

The symbols are, obviously, from the C++ standard library. Under some circumstances - at the very least, when you invoke GCC using the gcc binary rather than g++ - GCC compiles C++ code, but doesn't automatically link against the GNU C++ standard library. If for some reason this isn't resolved by invoking g++, you could try adding the -lstdc++ flag, which means "link against the library libstdc++.so or libstdc++.a which you should find in the library search path".

Source https://stackoverflow.com/questions/57524025

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