Exit early when $PWD isn't set. Remove unused unistd.h include.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@180670 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 7e3ed2461aa9a9d8c32a3eebd4382f0f9c294d9a..fb5bad4f24e164ce4d03b0008f95be73f352ec13 100644 (file)
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -8,7 +8,6 @@
 //===----------------------------------------------------------------------===//
 
 #include <sys/stat.h>
-#include <unistd.h>
 #include "Tools.h"
 #include "InputInfo.h"
 #include "SanitizerArgs.h"
@@ -1780,9 +1779,11 @@ static bool shouldUseLeafFramePointer(const ArgList &Args,
 static void addDebugCompDirArg(const ArgList &Args, ArgStringList &CmdArgs) {
   struct stat StatPWDBuf, StatDotBuf;
 
-  const char *pwd;
-  if ((pwd = ::getenv("PWD")) != 0 &&
-      llvm::sys::path::is_absolute(pwd) &&
+  const char *pwd = ::getenv("PWD");
+  if (!pwd)
+    return;
+
+  if (llvm::sys::path::is_absolute(pwd) &&
       stat(pwd, &StatPWDBuf) == 0 &&
       stat(".", &StatDotBuf) == 0 &&
       StatPWDBuf.st_ino == StatDotBuf.st_ino &&