Improve -Wheader-hygiene to warn about using directives inside linkage
specifications within the global scope, from Elliot Glaysher.

llvm-svn: 128352
3 files changed
tree: 2ca02d0fcf09b01f586f6f1930ce08a008111139
  1. clang/
  2. compiler-rt/
  3. debuginfo-tests/
  4. libcxx/
  5. lldb/
  6. llvm/