GLIBCXX_3.4.21 not defined in file libstdc++.so.6 with link time reference

Question

Apologies, I understand questions very similar to this have been asked relatively often, although none of the solutions seem to work for me.When attempting to run any c++ code o

Answer 1

So I was having the same error on ubuntu 18.04, and these are the steps to fix it:

1. Run this to check the what is missing

strings /usr/lib/x86_64-linux-gnu/libstdc++.so.6 | grep GLIBCXX

You will get something like

GLIBCXX_3.4
GLIBCXX_3.4.1
GLIBCXX_3.4.2
GLIBCXX_3.4.3
GLIBCXX_3.4.4
GLIBCXX_3.4.5
GLIBCXX_3.4.6
GLIBCXX_3.4.7
GLIBCXX_3.4.8
GLIBCXX_3.4.9
GLIBCXX_3.4.10
GLIBCXX_3.4.11
GLIBCXX_3.4.12
GLIBCXX_3.4.13
GLIBCXX_3.4.14
GLIBCXX_3.4.15
GLIBCXX_3.4.16
GLIBCXX_3.4.17
GLIBCXX_3.4.18
GLIBCXX_3.4.19
GLIBCXX_3.4.20
GLIBCXX_3.4.21
GLIBCXX_DEBUG_MESSAGE_LENGTH

Then run:

sudo add-apt-repository ppa:ubuntu-toolchain-r/test

sudo apt-get update

sudo apt-get install gcc-5

sudo apt-get upgrade libstdc++6

At least run again to confirm the changes

strings /usr/lib/x86_64-linux-gnu/libstdc++.so.6 | grep GLIBCXX

Answer 2

before_install:

This workaround is required to avoid libstdc++ errors while running "extended" hugo with SASS support.

• wget -q -O libstdc++6 http://security.ubuntu.com/ubuntu/pool/main/g/gcc-5/libstdc++6_5.4.0-6ubuntu1~16.04.10_amd64.deb

• sudo dpkg --force-all -i libstdc++6

  install:

• wget -q -O hugo.deb https://github.com/gohugoio/hugo/releases/download/v0.46/hugo_extended_0.46_Linux_64bit.deb

• sudo dpkg -i hugo.deb

I found this answer here, and it worked for me

Answer 3

update libstdc++6 download link to:

http://security.ubuntu.com/ubuntu/pool/main/g/gcc-5/libstdc++6_5.4.0-6ubuntu1~16.04.12_amd64.deb

Answer 4

GCC 5.1 or 5.2 (can't remember now, google it) changed C++ ABI. Your standard ubuntu (including libstdc++) is compiled with old ABI.

Your gcc compiler tries to use new ABI. Sometimes it works, most of the time - no.

So, there are 3 ways to compile your code:

1) downgrade gcc

2) add -D_GLIBCXX_USE_CXX11_ABI=0 (cmake example) flag (if you go this way, you should add this flag to every makefile or project you build till you upgrade ubuntu or downgrade gcc)

3) upgrade Ubuntu (tested it, by the way 16.04 goes with new ABI and new gcc by default, I had to ack-grep and remove flag mentioned above from all my pet projects)

also: Understanding GCC 5's _GLIBCXX_USE_CXX11_ABI or the new ABI

P.S. funny thing, the answer is in the question: _ZNSt7__cxx11 : CXX11, though we don't really read error messages.