Update default clang version to 3.9 and require xcode 8

This change updates the default clang version used to build CoreRT to the
latest stable version 3.9. It also removes the version 3.5 from the supported
ones. The 3.5 has a bug preventing us from using thread_local C++ feature.

Due to the same reason, the minimum supported xcode version on OSX is 8, so
the prerequisities document is updated accordingly.

1 files changed, 9 insertions, 1 deletions

diff --git a/buildscripts/buildvars-setup.sh b/buildscripts/buildvars-setup.sh
index 7e259b407..ead93b646 100755
--- a/buildscripts/buildvars-setup.sh
+++ b/buildscripts/buildvars-setup.sh
@@ -149,7 +149,7 @@ export __UnprocessedBuildArgs=
 export __CleanBuild=0
 export __VerboseBuild=0
 export __ClangMajorVersion=3
-export __ClangMinorVersion=5
+export __ClangMinorVersion=9
 export __CrossBuild=0
 
 
@@ -202,6 +202,14 @@ while [ "$1" != "" ]; do
             export __ClangMajorVersion=3
             export __ClangMinorVersion=7
             ;;
+        clang3.8)
+            export __ClangMajorVersion=3
+            export __ClangMinorVersion=8
+            ;;
+        clang3.9)
+            export __ClangMajorVersion=3
+            export __ClangMinorVersion=9
+            ;;
         cross)
             export __CrossBuild=1
             ;;