Clang CPP adds extra newline character

Running the following command (taken from the settings file)

cat ImportsSemi.hs | gcc -E -undef -traditional -Wunicode -Wno-invalid-pp-token -Wno-unicode - > out.hs

on any file results in a file which has an extra newline character appended to the end. This result is different from when gcc is used as the preprocessor, in this case no extra newline is appended.

I appreciate that this isn't important to most users but it is important for ghc-exactprint. With the extra newline character the EOF marker is moved one line further down. When we come to output the AST, we also get an extra newline at the bottom of the file which breaks roundtripping.

> gcc --version
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 6.0 (clang-600.0.56) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin14.0.0
Thread model: posix

Trac metadata

Trac field	Value
Version	7.8.4
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture