guile 2.2.3 crashing on osx 10.11?

[Dan Kegel <dank@kegel.com>]

Hi all!  Happily building and using guile on osx 10.12, 10.13, and Ubuntu 16.04.

osx 10.11, though, crashes when I just evaluate (display (version)),
or sometimes while building.

Happens whether I build it myself, or use brew.  Happens on more than
one machine, too.

This is with xcode 7.1:
$ cc --version
Apple LLVM version 7.0.0 (clang-700.1.76)
Target: x86_64-apple-darwin15.6.0
Thread model: posix

I think it also happens with xcode 7.3.1:
$ cc --version
Apple LLVM version 7.3.0 (clang-703.0.31)
Target: x86_64-apple-darwin15.6.0
Thread model: posix
InstalledDir: /Applications/Xcode7.3.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Haven't tried the latest, xcode 8.2.1.

For instance:

$ brew install guile
$ guile
...
scheme@(guile-user)> (display (version))
Illegal instruction: 4

Here's another: building from source fails early with

Making all in bootstrap
GUILE_AUTO_COMPILE=0 \
../meta/build-env \
guild compile --target="x86_64-apple-darwin15.6.0"                \
           -O1              \
  -L "/Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.3/module"
                        \
  -L "/Users/buildbot/src/yobuild/recipes/guile/btmp/guile-2.2.3/guile-readline"
\
  -o "ice-9/eval.go" "../module/ice-9/eval.scm"
make[2]: *** [ice-9/eval.go] Illegal instruction: 4
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

Anyone run into this before?

- Dan