From 5dc555e26d19871cb8baeb40466d7660001abe5c Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 8 Mar 2005 09:24:24 -0500
Subject: [PATCH] BUG: Dependency scans and checks must always set the current
 working directory to the directory containing the Makefile.

---
 Source/cmDepends.cxx | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/Source/cmDepends.cxx b/Source/cmDepends.cxx
index feb6625e7..8601f81e2 100644
--- a/Source/cmDepends.cxx
+++ b/Source/cmDepends.cxx
@@ -19,6 +19,8 @@
 #include "cmGeneratedFileStream.h"
 #include "cmSystemTools.h"
 
+#include <assert.h>
+
 //----------------------------------------------------------------------------
 cmDepends::cmDepends(const char* dir, const char* targetFile):
   m_Directory(dir),
@@ -44,6 +46,10 @@ cmDepends::~cmDepends()
 //----------------------------------------------------------------------------
 bool cmDepends::Write()
 {
+  // Dependency generation must always be done in the current working
+  // directory.
+  assert(m_Directory == ".");
+
   // Try to generate dependencies for the target file.
   cmGeneratedFileStream fout(m_DependsMakeFile.c_str());
   fout << "# Dependencies for " << m_TargetFile.c_str() << std::endl;
@@ -63,6 +69,14 @@ bool cmDepends::Write()
 //----------------------------------------------------------------------------
 void cmDepends::Check()
 {
+  // Dependency checks must be done in proper working directory.
+  std::string oldcwd = ".";
+  if(m_Directory != ".")
+    {
+    oldcwd = cmSystemTools::GetCurrentWorkingDirectory();
+    cmSystemTools::ChangeDirectory(m_Directory.c_str());
+    }
+
   // Check whether dependencies must be regenerated.
   std::ifstream fin(m_DependsMakeFile.c_str());
   if(!(fin && this->CheckDependencies(fin)))
@@ -70,6 +84,12 @@ void cmDepends::Check()
     // Clear all dependencies so they will be regenerated.
     this->Clear();
     }
+
+  // Restore working directory.
+  if(oldcwd != ".")
+    {
+    cmSystemTools::ChangeDirectory(oldcwd.c_str());
+    }
 }
 
 //----------------------------------------------------------------------------