[Issue 21874] The test suite fails with most recent GDB versions

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21874

--- Comment #2 from Basile-z <b2.temp at gmx.com> ---
i suggest a '--nogdb' option in the time being. Most CI services will still use
the LTS ubuntu with GDB 9 for a while tho.

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