Module [extern_c] attribute: inherit to submodules, don't write 'extern "C"'
blocks when building in C mode, and serialize and deserialize the attribute.


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@203317 91177308-0d34-0410-b5e6-96231b3b80d8
Revert accidentally-committed file.


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@203318 91177308-0d34-0410-b5e6-96231b3b80d8
Add an option to disable plugins in clang.

An option with the same name already exists in the makefile build.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@203320 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "Add an option to disable plugins in clang."

This reverts commit r203320.

There is some order dependency going on that I missed.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@203321 91177308-0d34-0410-b5e6-96231b3b80d8