firefox fails to update due to failure in lang/rust: elf_update() failed: Layout constraint violation

[O. Hartmann]

On recent CURRENT (FreeBSD 11.0-CURRENT #32 r297237: Thu Mar 24 17:54:15 CET 2016 amd64)
an update of ports and so www/firefox (svn Revision: 411904) fails:

[...]
mkdir -p tmp/empty_dir
gmake[3]: Leaving directory '/usr/ports/lang/rust/work/rustc-1.7.0'
install: creating uninstall script
at /usr/ports/lang/rust/work/stage/usr/local/lib/rustlib/uninstall.sh install: installing
component 'rust-std-x86_64-unknown-freebsd'

    std is standing at the ready.

install: creating uninstall script
at /usr/ports/lang/rust/work/stage/usr/local/lib/rustlib/uninstall.sh install: installing
component 'rustc'

    Rust is ready to roll.

gmake[2]: Leaving directory '/usr/ports/lang/rust/work/rustc-1.7.0'
strip: elf_update() failed: Layout constraint violation
*** Error code 1

Stop.
make[1]: stopped in /usr/ports/lang/rust
*** Error code 1

Stop.
make: stopped in /usr/ports/lang/rust

===>>> make stage failed for lang/rust
===>>> Aborting update

===>>> Update for lang/rust failed
===>>> Aborting update

===>>> Update for www/firefox failed
===>>> Aborting update