clang bug on mac, workaround

[Greg Troxel]

Recently someone added this line of workaround to pkgsrc:

  ENV.append_to_cflags "-fno-stack-check" if 
DevelopmentTools.clang_build_version >= 1010

  (from
  https://github.com/Homebrew/homebrew-core/blob/master/Formula/guile.rb#L42
  )

for guile 2.2.7.


I don't know yet if this affects 3, but it seems it would be nice for
guile itself to add -fno-stack-check for the combination of mac and
newish clang.


Has anyone else see this?

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