Linking fails on Centos7

[dagnic]

Hi,

I report a linking error on Centos 7 with yaml-cpp from the conda-forge repository.

Step to reproduce:

Run a docker container from conda/miniconda3-centos7

docker run -i -t conda/miniconda3-centos7 /bin/bash

Install g++ 10 suite, yaml-cpp from conda-forge, build a test program

conda install -c conda-forge yaml-cpp
yum update -y
yum install -y centos-release-scl-rh
yum install -y devtoolset-10
export PATH=/opt/rh/devtoolset-10/root/bin:$PATH
# or scl enable devtoolset-10 bash
g++ -o test -I/usr/local/include -L/usr/local/lib test.cpp -lyaml-cpp

that gives:

/opt/rh/devtoolset-10/root/usr/libexec/gcc/x86_64-redhat-linux/10/ld: /tmp/cc22r2Wj.o: in function `YAML::operator<<(YAML::Emitter&, char const*)':
test.cpp:(.text._ZN4YAMLlsERNS_7EmitterEPKc[_ZN4YAMLlsERNS_7EmitterEPKc]+0x43):undefined reference to `YAML::Emitter::Write(std::string const&)'
collect2: error: ld returned 1 exit status

The test program is:

#include <yaml-cpp/yaml.h>
#include <iostream>
int main (void){
    YAML::Emitter out;
    out << "Hello, World!";
    std::cout << "Here's the output YAML:\n" << out.c_str();
    return 0;
}