Linux: v4.69.1 depends on libc++1

[GruberMarkus]

On Linux, MSAL.Net v4.69.1 with broker support requires libc++1 or one of its dependencies to work.

MSAL.Net does not check this dependency, the error message is very generic:
"Unable to load shared library 'msalruntime' or one of its dependencies. In order to help diagnose loading problems, consider using a tool like strace.
| If you're using glibc, consider setting the LD_DEBUG environment variable: /opt/microsoft/powershell/7/msalruntime.so: cannot open shared object file: No such file or directory
| /tmp/891b29c2-3267-4bf5-8484-e754c680068e/MSAL.PS/netstandard2.0/msalruntime.so: cannot open shared object file: No such file or directory /opt/microsoft/powershell/7/libmsalruntime.so: cannot open
| shared object file: No such file or directory libc++.so.1: cannot open shared object file: No such file or directory /opt/microsoft/powershell/7/msalruntime: cannot open shared object file: No such file
| or directory /tmp/891b29c2-3267-4bf5-8484-e754c680068e/MSAL.PS/netstandard2.0/msalruntime: cannot open shared object file: No such file or directory /opt/microsoft/powershell/7/libmsalruntime: cannot
| open shared object file: No such file or directory /tmp/891b29c2-3267-4bf5-8484-e754c680068e/MSAL.PS/netstandard2.0/libmsalruntime: cannot open shared object file: No such file or directory See
| https://aka.ms/msal-net-wam#troubleshooting"

I only found about the missing dependencies by running the following command:

ldd libmsalruntime.so | grep "not found"

which results in

libc++.so.1 => not found
libc++abi.so.1 => not found
libunwind.so.1 => not found

Please advice is libc++1 will remain a requirement, or if this dependency will be removed from MSAL.Net.

Thanks in advance!

[xinyuxu1026]

Hi @GruberMarkus , yes, Microsoft.Identity.Client.NativeInterop depends on libc to import the dynamic libraries. I think we can update the documentation of the required dependency for Linux broker use.

[GruberMarkus]

Is this a dependency that only Microsoft.Identity.Client.NativeInterop has, or is lic++1 required anyhow by the basic broker components outside of MSAL (I think about the microsoft-identity-broker and microsoft-intune linux packages)?

[xinyuxu1026]

@GruberMarkus , I just checked with microsoft-identity-broker and microsoft-intune linux folks, they don't require libc++1

[GruberMarkus]

@xinyuxu1026: So, where does this dependency come from? And where is it documented?

The dependencies are not part of the NuGet packages.

[xinyuxu1026]

@GruberMarkus , we added the documentation here: https://learn.microsoft.com/en-us/entra/msal/dotnet/acquiring-tokens/desktop-mobile/linux-dotnet-sdk-wsl?tabs=ubuntudep#package-dependencies