A long time ago I submitted PR misc/17848 which removes CSRG libm sources. The audit trail shows some commentary, but AFAICT nothing much has been done based on that commentary. With the upcoming release of of 5.0, I think we should consider the removal od CSRG libm and the repo copying of msun to libm; otherwise we'll drag CSRG libm around until 6.0.
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