Commits on Mar 1, 2018

1. Use pre-ino64 FreeBSD symbols to resolve binary compatibility. …

   This follows the same method as other platforms like OSX and NetBSD.
   
   This will fix rustup and building from git (once libc is updated for bootstrap)
   on FreeBSD12 post-ino64 in freebsd/freebsd-src@f713b08.
   It also avoids having to hotpatch the stage0 compiler, and HOME/.cargo
   libc files on FreeBSD12 to build rust.
   
   The only real pitfall is that this will prevent interaction with inodes that
   have an ino_t above the 32-bit limit due to truncation.  On the other hand
   Rust won't work at all on 12 without doing this currently.  In general
   it should not be a problem for users and if they need 64-bit ino_t they
   can use a patched libc, rather than the current state of affairs in
   requiring a patched libc to use Rust on 12.
   
   A better, or complementary, approach would be something like proposed in
   rust-lang/rfcs#2048 to allow targetting a specific
   version of FreeBSD. This would allow Rust to default to this compatibility
   mode by targetting FreeBSD10 and still allow targetting FreeBSD12 for 64-bit
   ino_t.
   
   The symbol versions used were taken from the old version in
   freebsd/freebsd-src@f713b08#diff-61a32fcfb7ecd4517665fed591813c57
   and
   freebsd/freebsd-src@f713b08#diff-7f67ccf8b5f44ff2f54eaab0207abb8d.
   
   The scope of functions versioned here differs from other platforms as
   not all structs were modified that were on others, such as DIR for
   `opendir`, `telldir`, etc.  Only functions using dirent, stat, glob_t,
   and dev_t need the changes.
   
   Fixes rust-lang/rust#42681

   

   bdrewery committed Mar 1, 2018
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