https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248184

--- Comment #5 from [email protected] ---
A commit references this bug:

Author: tobik
Date: Fri Jul 24 15:50:57 UTC 2020
New revision: 543251
URL: https://svnweb.freebsd.org/changeset/ports/543251

Log:
  lang/rust-nightly: Attempt to fix intermittent "can't find crate for `std`"
build failures

  The location of rustc (found via env::current_exe()) is used to
  find the right libstd.  However it might have been "copied" by
  creating a hard link to the new location instead.  Like /proc/curproc/file,
  KERN_PROC_PATHNAME (used internally by current_exe()) can return
  any of the file's multiple paths.  Most of the time it returns the
  right rustc path and the build will succeed but occasionally it
  will return the "wrong" path and the build fails with:

      error[E0463]: can't find crate for `std`

  If this is right a viable workaround should be to never create hard
  links during the build, so let's try that.

  Also drop the related llvm-config-wrapper workaround.

  PR:           248184

Changes:
  head/lang/rust-nightly/files/patch-src_bootstrap_lib.rs
  head/lang/rust-nightly/files/patch-src_bootstrap_native.rs

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