我想运行全功能 of c++20 on g++。但是，我需要为此目的安装g++-9。
在安装导轨之后，g++的旧版本不适用于g++-9。
有什么暗示吗？
sudo apt install g++-9
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package g++-9
E: Couldn't find any package by regex 'g++-9'。
sudo apt install g++9
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'libconfig9' for regex 'g++9'
Note, selecting 'libaac-tactics-ocaml-ibg92' for regex 'g++9'
Note, selecting 'libounit-ocaml-dev-afg95:i386' for regex 'g++9'
Note, selecting 'libjpeg9-dbg' for regex 'g++9'
Note, selecting 'libjpeg9-dev' for regex 'g++9'
Note, selecting 'libreins-ocaml-dev-rpyg9' for regex 'g++9'
Note, selecting 'libaac-tactics-ocaml-dev-ibg92' for regex 'g++9'
Note, selecting 'libjpeg9' for regex 'g++9'
Note, selecting 'libflac-ocaml-77yg9:i386' for regex 'g++9'
Note, selecting 'libflac-ocaml-dev-77yg9:i386' for regex 'g++9'
Note, selecting 'libaac-tactics-ocaml' instead of 'libaac-tactics-ocaml-ibg92'
Note, selecting 'libaac-tactics-ocaml-dev' instead of 'libaac-tactics-ocaml-dev-ibg92'
Note, selecting 'libreins-ocaml-dev' instead of 'libreins-ocaml-dev-rpyg9'
Note, selecting 'libflac-ocaml:i386' instead of 'libflac-ocaml-77yg9:i386'
Note, selecting 'libflac-ocaml-dev:i386' instead of 'libflac-ocaml-dev-77yg9:i386'
Note, selecting 'libounit-ocaml-dev:i386' instead of 'libounit-ocaml-dev-afg95:i386'
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
libaac-tactics-ocaml : Depends: libcoq-ocaml-d91z1
Depends: ocaml-base-nox-4.02.3
Recommends: libaac-tactics-coq but it is not going to be installed
libaac-tactics-ocaml-dev : Depends: camlp5-tli55
Depends: libcoq-ocaml-dev-d91z1
Depends: ocaml-nox-4.02.3
libflac-ocaml-dev:i386 : Depends: libogg-ocaml-dev-465c2:i386
Depends: ocaml-nox-4.02.3:i386
Depends: libogg-ocaml-dev:i386 but it is not going to be installed
libounit-ocaml-dev:i386 : Depends: ocaml-nox-4.02.3:i386
libreins-ocaml-dev : Depends: ocaml-nox-4.02.3
E: Unable to correct problems, you have held broken packages.
回答 1
Ask Ubuntu用户
发布于 2020-03-09 02:19:42
安装g++ 8
sudo apt install g++-8使用c++ 20版本运行g++-8 .
g++-8 -std=c++2a text.c++ -o compiled页面原文内容由Ask Ubuntu提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://askubuntu.com/questions/1079885
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