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When compiling a program that includes <bits/floatn.h> using a clang version between 3.4 (included) and 3.8.1 (included), clang will fail with `unknown type name '__float128'; did you mean '__cfloat128'?`. This changes fixes the clang prerequirements macro call in floatn.h to check for clang 3.9 instead of 3.4, since support for __float128 was actually enabled in 3.9 by: commit 50f29e06a1b6a38f0bba9360cbff72c82d46cdd4 Author: Nemanja Ivanovic <nemanja.i.ibm@gmail.com> Date: Wed Apr 13 09:49:45 2016 +0000 Enable support for __float128 in Clang This fixes bug 32694. Signed-off-by: koraynilay <koray.fra@gmail.com> Reviewed-by: H.J. Lu <hjl.tools@gmail.com>