Compiler error with yaml-cpp - undefined reference to `YAML::detail::node_data::convert_to_map`

Question

Here's the complete log:

/tmp/ccCvErNZ.o: In function `YAML::detail::node& YAML::detail::node_data::get<std::string>(std::string const&, std::shared_ptr<YAML::detail::memory_holder>)':
cricket.cpp:(.text._ZN4YAML6detail9node_data3getISsEERNS0_4nodeERKT_St10shared_ptrINS0_13memory_holderEE[_ZN4YAML6detail9node_data3getISsEERNS0_4nodeERKT_St10shared_ptrINS0_13memory_holderEE]+0x94): undefined reference to `YAML::detail::node_data::convert_to_map(std::shared_ptr<YAML::detail::memory_holder>)'
collect2: error: ld returned 1 exit status

The code I'm trying to compile is simple

#include <iostream>
#include <yaml-cpp/yaml.h>

using namespace std;

int main() {
    YAML::Node test = YAML::LoadFile("test.yaml");
    if (test["date"]) {
      cout << "HELLO";
    }

    return 0;
}

The YAML I'm using is the example from http://www.yaml.org/start.html

If I just try to load the YAML, it loads fine. But if I try to access any data I get the same error. So it's not a linking problem.

EDIT: I can do things like cout << test and cout << test.type() and other functions. I think the problem is in using a string based map for accessing internal nodes.

That's not the complete log, that's just the error messages. You have a linkage error so you need to show us the failing linkage command. It is the g++ ... command from which the errors follow. Post it in the body of your question. — Mike Kinghan
– Mike Kinghan, Commented May 4, 2016 at 15:00
@Mike Kinghan ` In function YAML::detail::node& YAML::detail::node_data::get<std::string>(std::string const&, boost::shared_ptr<YAML::detail::memory_holder>)': /usr/include/yaml-cpp/node/detail/impl.h:89: undefined reference to YAML::detail::node_data::convert_to_map(boost::shared_ptr<YAML::detail::memory_holder>)'` — Samer
– Samer, Commented May 5, 2016 at 0:22
@MikeKinghan unfortunately I cannot edit the post, since it is not my post, but my cmake file is in the comments at the end of this page.... — Samer
– Samer, Commented May 5, 2016 at 1:27

Albert Pumarola · Accepted Answer · 2016-05-08 17:48:30Z

10

+50

It seems that you are not properly linking the yaml-cpp library. Add the argument -lyaml-cpp when compiling. For example:

g++ -I/usr/local/include -L/usr/local/lib -lyaml-cpp -o test main.cpp

EDIT

Another option is to include this cmake to your CMakeLists.txt:

# attempt to find static library first if this is set
if(YAMLCPP_STATIC_LIBRARY)
    set(YAMLCPP_STATIC libyaml-cpp.a)
endif()

# find the yaml-cpp include directory
find_path(YAMLCPP_INCLUDE_DIR yaml-cpp/yaml.h
          PATH_SUFFIXES include
          PATHS
          ~/Library/Frameworks/yaml-cpp/include/
          /Library/Frameworks/yaml-cpp/include/
          /usr/local/include/
          /usr/include/
          /sw/yaml-cpp/         # Fink
          /opt/local/yaml-cpp/  # DarwinPorts
          /opt/csw/yaml-cpp/    # Blastwave
          /opt/yaml-cpp/
          ${YAMLCPP_DIR}/include/)

# find the yaml-cpp library
find_library(YAMLCPP_LIBRARY
             NAMES ${YAMLCPP_STATIC} yaml-cpp
             PATH_SUFFIXES lib64 lib
             PATHS ~/Library/Frameworks
                    /Library/Frameworks
                    /usr/local
                    /usr
                    /sw
                    /opt/local
                    /opt/csw
                    /opt
                    ${YAMLCPP_DIR}/lib)

# handle the QUIETLY and REQUIRED arguments and set YAMLCPP_FOUND to TRUE if all listed variables are TRUE
include(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(YAMLCPP DEFAULT_MSG YAMLCPP_INCLUDE_DIR YAMLCPP_LIBRARY)
mark_as_advanced(YAMLCPP_INCLUDE_DIR YAMLCPP_LIBRARY)

edited May 8, 2016 at 17:48

answered May 4, 2016 at 8:59

Albert Pumarola

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2 Comments

Samer Over a year ago

here is my cmake:

find_package(yaml-cpp REQUIRED) set(PCL_BUILD_TYPE Release) add_executable (extract_c src/main.cpp) target_link_libraries (extract_c yaml-cpp)

Albert Pumarola Over a year ago

Take a loot at this cmake to find yaml-cpp github.com/supercollider/supercollider/blob/master/…

Lesser Cormorant · Accepted Answer · 2016-05-04 15:27:36Z

2

I experienced something similar to this when trying to compile OpenXcom on a Debian system. It turned out that I was using a mix of testing and stable packages, the yaml package was from stable, and the combination somehow made linking fail if there were more than just a few initial functions.

If that is what you're experiencing (and you're using Debian too), try compiling a source package from stable with

apt-get --build source libyaml-cpp0.5/stable

This command will build .deb packages for libyaml, and you can then insert them with dpkg like this:

dpkg -i libyaml-cpp0.5*.deb

as root.

Compiling libyaml from source will make it link to the testing libraries you already have, instead of expecting stable libraries, and so should solve the problem above. It did for me, at least.

Even if you don't use Debian, compiling yaml-cpp from source (e.g. a tarball) might work for similar reasons.

edited May 4, 2016 at 15:27

answered Apr 10, 2016 at 9:03

Lesser Cormorant

737 bronze badges

8 Comments

Samer Over a year ago

what do you mean by then insert it with dpkg

Lesser Cormorant Over a year ago

Use dpkg -i to install the packages the compilation process creates. I've elaborated on how to do so now.

Samer Over a year ago

Do I need to do dpkg remove to the current yaml-cpp?

Lesser Cormorant Over a year ago

If your current yaml-cpp is already 0.5, it shouldn't matter because it should just replace the old one with the new one. However, I'm not entirely certain, so remove the current one just to be sure if it's not too much of a hassle.

Samer Over a year ago

I did all of the above and till getting the same linking error!

|

sel-fish · Accepted Answer · 2016-05-08 03:53:21Z

1

Make sure these two files exist:

/usr/local/lib/libyaml-cpp.a
/usr/local/include/yaml-cpp/yaml.h

My CMakeLists.txt:

CMAKE_MINIMUM_REQUIRED(VERSION 3.4)
FIND_PACKAGE(yaml-cpp REQUIRED)
ADD_EXECUTABLE(yaml_cpp_test yaml_cpp_test.cpp)
TARGET_LINK_LIBRARIES(yaml_cpp_test yaml-cpp)

The content of yaml_cpp_test.cpp is same as mentioned in the question.

I try to reappear the problem on vps (Ubuntu 14.04.1 LTS)

wget -c https://github.com/jbeder/yaml-cpp/archive/release-0.5.1.tar.gz
tar xvf release-0.5.1.tar.gz yaml-cpp-release-0.5.1/
cd yaml-cpp-release-0.5.1/
sudo apt-get install cmake
sudo apt-get install libboost-dev
cmake .
make
make install

after that, yaml-cpp install to /usr/local/lib and /usr/local/include
files in my working directory:

fqlgy@li407-86:~/yaml-cpp$ ll
total 12
-rw-r--r-- 1 fqlgy fqlgy 162 May  8 03:29 CMakeLists.txt
-rw-r--r-- 1 fqlgy fqlgy  10 May  8 03:11 test.yaml
-rw-r--r-- 1 fqlgy fqlgy 240 May  8 03:11 yaml_cpp_test.cpp

As i tried to run "cmake .", there is some error, so i delete the line CMakeFiles/CMakeOutput.log, the content of CMakeLists.txt is :

CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
ADD_EXECUTABLE(yaml_cpp_test yaml_cpp_test.cpp)
TARGET_LINK_LIBRARIES(yaml_cpp_test yaml-cpp)

The following output is as expected:

fqlgy@li407-86:~/yaml-cpp$ cmake .
-- Configuring done
-- Generating done
-- Build files have been written to: /home/fqlgy/yaml-cpp
fqlgy@li407-86:~/yaml-cpp$ make
Scanning dependencies of target yaml_cpp_test
[100%] Building CXX object CMakeFiles/yaml_cpp_test.dir/yaml_cpp_test.cpp.o
Linking CXX executable yaml_cpp_test
[100%] Built target yaml_cpp_test
fqlgy@li407-86:~/yaml-cpp$ ./yaml_cpp_test
HELLO

edited May 8, 2016 at 3:53

answered May 6, 2016 at 2:32

sel-fish

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11 Comments

Samer Over a year ago

I did the exact same thing and still, I got the same error...this is crazy!

Samer Over a year ago

In function YAML::detail::node& YAML::detail::node_data::get<std::string>(std::string const&, boost::shared_ptr<YAML::detail::memory_holder>)': yaml_example.cpp:(.text._ZN4YAML6detail9node_data3getISsEERNS0_4nodeERKT_N5boost10shared_ptrINS0_13memory_holderEEE[_ZN4YAML6detail9node_data3getISsEERNS0_4nodeERKT_N5boost10shared_ptrINS0_13memory_holderEEE]+0xae): undefined reference to YAML::detail::node_data::convert_to_map(boost::shared_ptr<YAML::detail::memory_holder>)'

sel-fish Over a year ago

may you try to run "nm /usr/local/lib/libyaml-cpp.a |grep convert_to_map" to check the symbol?

Samer Over a year ago

0000000000001670 T _ZN4YAML6detail9node_data14convert_to_mapEN5boost10shared_ptrINS0_13memory_holderEEE 0000000000000060 r _ZZN4YAML6detail9node_data14convert_to_mapEN5boost10shared_ptrINS0_13memory_holderEEEE19__PRETTY_FUNCTION__

sel-fish Over a year ago

It' ok to build from source. I will try it on the same os version and give you feedback later.

|

Ilya Golshtein · Accepted Answer · 2019-09-19 08:59:08Z

1

I confirm that certain versions of yaml-cpp library contain this issue (and it is not about improper linking). It is rather dirty, but I've resolved it by defining empty functions in my code, it looks like

    YAML::BadConversion::~BadConversion()
    {
    }

    void  YAML::detail::node_data::convert_to_map(std::shared_ptr<YAML::detail::memory_holder>)
    {
    }

The approach is not perfect (e.g. because it causes duplicates if another library version is used).

answered Sep 19, 2019 at 8:59

Ilya Golshtein

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1 Comment

mzoll Over a year ago

was for me the case for v0.6.0; building and installing v0.7.0 resolved the problem;

qingshi ji · Accepted Answer · 2023-01-31 06:01:44Z

1

It bothered me, too. I met it when version of yaml-cpp was "0.7.0". I solved it by using "0.6.0" instead.

answered Jan 31, 2023 at 6:01

qingshi ji

111 bronze badge

Comments

Ilham Wicaksono · Accepted Answer · 2020-09-16 04:46:42Z

In my case, I run the exact same code on two computer which only give error on one of them and that almost make me crazy. This is not a compilation error, linking error or something, I think the code is dirty or something else.

I tried all option:

regular building from source and installing using cmake .. => make => make install
same as 1, with CC=$(which gcc) CXX=$(which g++) cmake -DBUILD_SHARED_LIBS=ON ..
uninstalling the default package from apt (i use ubuntu 16.04)

all failed, until I find Ilya Golshtein's answer, then in my code which will use yaml-cpp I added this code jsut before YAML::LoadFIle Line

    YAML::BadConversion::~BadConversion()
{
}

void  YAML::detail::node_data::convert_to_map(std::shared_ptr<YAML::detail::memory_holder>)
{
}

This is the only solution that worked

als0052 · Accepted Answer · 2022-06-07 21:51:10Z

0

I'm late to the party here and have no idea what I'm doing but for those of you on Windows, make sure your IDE likes your mingw-g++. Mine auto-defaulted to strawberry perl (?) and when I changed it to mingw-g++ everything started working. I suppose it has something to do with the versioning?

answered Jun 7, 2022 at 21:51

als0052

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Comments

Vassili Korotkin · Accepted Answer · 2023-08-18 17:20:57Z

0

In my case it was an issue of multiple libraries being installed. I had ROS installed already which seems to ship with yaml-cpp as well. The conflicts between the different versions triggered undefined reference errors.

Uninstalling all the yaml-cpp versions I added solved the issue.

answered Aug 18, 2023 at 17:20

Vassili Korotkin

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