Back out "fix boost macOS build with new Xcode" (#27)

Summary:
Pull Request resolved: https://github.com/facebookexperimental/eden/pull/27

Pull Request resolved: https://github.com/facebookexperimental/rust-shed/pull/9

Original diffs: D22417488 (https://github.com/facebook/folly/commit/43d80f110b181dd7f72f0f935322a58f9cbb5147), D22528869 (https://github.com/facebook/folly/commit/3930a6ef4437f161c50ac27141cd397eda999fa7)

Reviewed By: markbt

Differential Revision: D22571972

fbshipit-source-id: c6f013565680a757b642dd79e647207fce3351ec

build/fbcode_builder/getdeps/builder.py

@@ -802,16 +802,8 @@ class Boost(BuilderBase):
         linkage = ["static"]
         if self.build_opts.is_windows():
             linkage.append("shared")
-
-        args = []
-        if self.build_opts.is_darwin():
-            clang = subprocess.check_output(["xcrun", "--find", "clang"])
-            user_config = os.path.join(self.build_dir, "project-config.jam")
-            with open(user_config, "w") as jamfile:
-                jamfile.write("using clang : : %s ;\n" % clang.decode().strip())
-            args.append("--user-config=%s" % user_config)
-
         for link in linkage:
+            args = []
             if self.build_opts.is_windows():
                 bootstrap = os.path.join(self.src_dir, "bootstrap.bat")
                 self._run_cmd([bootstrap], cwd=self.src_dir)

build/fbcode_builder/manifests/boost

@@ -81,6 +81,3 @@ builder = boost
 --with-timer
 --with-type_erasure
 --with-wave
-
-[b2.args.os=darwin]
-toolset=clang