Not all built assemblies have deterministic source paths

[tmds]

When building with deterministic source paths, the path stored for the pdb in the dll is supposed to be mapped. As observed in dotnet/source-build#4011, this is the case for some runtime assemblies, but not for all.

Reproducer:

To build with deterministic source paths, ContinuousIntegrationBuild must be set to true.

./build.sh /p:ContinuousIntegrationBuild=true -c Release --subset lib

Looking at the built output assemblies, it seems that the pre-trimmed assemblies have the correct path.

For example:

$ strings ./artifacts/obj/System.Linq/Release/net9.0/PreTrim/System.Linq.dll | grep pdb
/_/artifacts/obj/System.Linq/Release/net9.0/System.Linq.pdb

vs

$ strings ./artifacts/obj/System.Linq/Release/net9.0/System.Linq.dll | grep pdb
/home/tmds/repos/runtime/artifacts/obj/System.Linq/Release/net9.0/System.Linq.pdb

cc @MichaelSimons @mthalman @ViktorHofer @omajid

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[tmds]

Looking at the built output assemblies, it seems that the pre-trimmed assemblies have the correct path.

@ViktorHofer based on this, I assume the issue is in the trimming/illinker. Is there someone familiar with this tooling that can take a closer look?

The top comment has instructions on how to reproduce and check the issue.

[ViktorHofer]

@vitek-karas or @sbomer should be able to help with linker issues.

[tmds]

@vitek-karas or @sbomer can one of you take a look?