error: version lookup error: version `GLIBCXX_3.4.26' not found

[ForNeVeR]

It turns out that 1.7.9 build was built in an updated environment (Appveyor upgraded something under the covers).

This means that it requires a bit newer Ubuntu 18.04.4 environment than the previous version.

In particular, this Dockerfile with a sample tdlib app will fail:

FROM mcr.microsoft.com/dotnet/core/runtime:3.1 AS base
WORKDIR /app

FROM mcr.microsoft.com/dotnet/core/sdk:3.1 AS build
WORKDIR /src
COPY ["ConsoleApp30/ConsoleApp30.csproj", "ConsoleApp30/"]
RUN dotnet restore "ConsoleApp30/ConsoleApp30.csproj"
COPY . .
WORKDIR "/src/ConsoleApp30"
RUN dotnet build "ConsoleApp30.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "ConsoleApp30.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENV LD_DEBUG=libs
ENTRYPOINT ["dotnet", "ConsoleApp30.dll"]

Thanks to ENV LD_DEBUG=libs, we can inspect what's happening there:

/usr/lib/x86_64-linux-gnu/libstdc++.so.6: error: version lookup error: version `GLIBCXX_3.4.26' not found (required by /app/runtimes/linux-x64/native/libtdjson.so) (fatal)

So, we require GLIBCXX_3.4.26 capability which isn't included into libstdc++.so.6 available in mcr.microsoft.com/dotnet/core/runtime:3.1. GLIBCXX_3.4.25 is available, though:

# apt-get install binutils
# strings /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.25 | grep GLIBCXX
[…]
GLIBCXX_3.4.25

[ForNeVeR]

I'm still figuring out how to convince that image to get an updated version of libstdc++6.

[ForNeVeR]

Okay, I think it would be better to just build with default Ubuntu 18.04 environment and not that crazy env Appveyor provides us. Trying to dockerize the Linux build…