[MacPorts] #69198: rust-bootstrap needs a lot of disk space to build

[MacPorts]

#69198: rust-bootstrap needs a lot of disk space to build
------------------------+---------------------------------
 Reporter:  ryandesign  |      Owner:  MarcusCalhoun-Lopez
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.9.0
 Keywords:              |       Port:  rust-bootstrap
------------------------+---------------------------------
 rust-bootstrap failed to build on a buildbot worker after consuming all
 23GB of available disk space:

 https://build.macports.org/builders/ports-10.12_x86_64-builder/builds/258909

 {{{
 LLVM ERROR: IO failure on output stream: No space left on device
 }}}

 Here is a build of rust-bootstrap-10.6 that finished with 4GB free after
 using 25GB of disk space:

 https://build.macports.org/builders/ports-10.12_x86_64-builder/builds/258910

 (so I'll retry the rust-bootstrap build since there's more free disk space
 now.)

 Here is a build of rust-bootstrap-10.6 that barely succeeded with 2GB to
 spare after using 33GB of disk space:

 https://build.macports.org/builders/ports-10.13_x86_64-builder/builds/219064

 Is there any way to make these ports use less disk space while building?
 Are there any intermediate files that could be deleted partway through the
 build?

-- 
Ticket URL: <https://trac.macports.org/ticket/69198>
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