[PATCH] Unify handling of PWD (llvm patch)

[Rafael Ávila de Espíndola]

Hi klimek, nicholas,

http://llvm-reviews.chandlerc.com/D1335

Files:
  lib/Support/Unix/Path.inc

Index: lib/Support/Unix/Path.inc
===================================================================
--- lib/Support/Unix/Path.inc
+++ lib/Support/Unix/Path.inc
@@ -298,6 +298,18 @@
 }
 
 error_code current_path(SmallVectorImpl<char> &result) {
+  result.clear();
+
+  const char *pwd = ::getenv("PWD");
+  llvm::sys::fs::file_status PWDStatus, DotStatus;
+  if (pwd && llvm::sys::path::is_absolute(pwd) &&
+      !llvm::sys::fs::status(pwd, PWDStatus) &&
+      !llvm::sys::fs::status(".", DotStatus) &&
+      PWDStatus.getUniqueID() == DotStatus.getUniqueID()) {
+    result.append(pwd, pwd + strlen(pwd));
+    return error_code::success();
+  }
+
 #ifdef MAXPATHLEN
   result.reserve(MAXPATHLEN);
 #else
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