From 6ee163875c5334647d09369f361f207f6a97fc49 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Sat, 10 Aug 2013 00:50:57 +0000
Subject: Check for $PWD in llvm::sys::current_path.

Some users (clang, libTooling) require this. After this patch we can remove
the calls to getenv("PWD") from clang.

llvm-svn: 188125
---
 llvm/lib/Support/Unix/Path.inc | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'llvm/lib/Support/Unix')

diff --git a/llvm/lib/Support/Unix/Path.inc b/llvm/lib/Support/Unix/Path.inc
index 4dcfa094a7b..f6a137e7a0b 100644
--- a/llvm/lib/Support/Unix/Path.inc
+++ b/llvm/lib/Support/Unix/Path.inc
@@ -298,6 +298,18 @@ UniqueID file_status::getUniqueID() const {
 }
 
 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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