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/*=========================================================================
Program: CMake - Cross-Platform Makefile Generator
Module: $RCSfile$
Language: C++
Date: $Date$
Version: $Revision$
Copyright (c) 2002 Kitware, Inc., Insight Consortium. All rights reserved.
See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#include "cmDepends.h"
#include "cmGeneratedFileStream.h"
#include "cmSystemTools.h"
#include "cmFileTimeComparison.h"
#include <assert.h>
//----------------------------------------------------------------------------
cmDepends::cmDepends(): m_Verbose(false), m_FileComparison(0),
m_MaxPath(cmSystemTools::GetMaximumFilePathLength()),
m_Dependee(new char[m_MaxPath]),
m_Depender(new char[m_MaxPath])
{
}
//----------------------------------------------------------------------------
cmDepends::~cmDepends()
{
delete [] m_Dependee;
delete [] m_Depender;
}
//----------------------------------------------------------------------------
bool cmDepends::Write(const char *src, const char *obj,
std::ostream &makeDepends, std::ostream &internalDepends)
{
return this->WriteDependencies(src, obj, makeDepends, internalDepends);
}
//----------------------------------------------------------------------------
void cmDepends::Check(const char *makeFile, const char *internalFile)
{
// Dependency checks must be done in proper working directory.
std::string oldcwd = ".";
if(m_CompileDirectory != ".")
{
// Get the CWD but do not call CollapseFullPath because
// we only need it to cd back, and the form does not matter
oldcwd = cmSystemTools::GetCurrentWorkingDirectory(false);
cmSystemTools::ChangeDirectory(m_CompileDirectory.c_str());
}
// Check whether dependencies must be regenerated.
std::ifstream fin(internalFile);
if(!(fin && this->CheckDependencies(fin)))
{
// Clear all dependencies so they will be regenerated.
this->Clear(makeFile);
this->Clear(internalFile);
}
// Restore working directory.
if(oldcwd != ".")
{
cmSystemTools::ChangeDirectory(oldcwd.c_str());
}
}
//----------------------------------------------------------------------------
void cmDepends::Clear(const char *file)
{
// Print verbose output.
if(m_Verbose)
{
cmOStringStream msg;
msg << "Clearing dependencies in \"" << file << "\"." << std::endl;
cmSystemTools::Stdout(msg.str().c_str());
}
// Remove the dependency mark file to be sure dependencies will be
// regenerated.
std::string markFile = file;
markFile += ".mark";
cmSystemTools::RemoveFile(markFile.c_str());
// Write an empty dependency file.
cmGeneratedFileStream depFileStream(file);
depFileStream
<< "# Empty dependencies file\n"
<< "# This may be replaced when dependencies are built." << std::endl;
}
//----------------------------------------------------------------------------
bool cmDepends::CheckDependencies(std::istream& internalDepends)
{
// Parse dependencies from the stream. If any dependee is missing
// or newer than the depender then dependencies should be
// regenerated.
bool okay = true;
while(internalDepends.getline(m_Dependee, m_MaxPath))
{
if ( m_Dependee[0] == 0 || m_Dependee[0] == '#' || m_Dependee[0] == '\r' )
{
continue;
}
size_t len = internalDepends.gcount()-1;
if ( m_Dependee[len-1] == '\r' )
{
len --;
m_Dependee[len] = 0;
}
if ( m_Dependee[0] != ' ' )
{
memcpy(m_Depender, m_Dependee, len+1);
continue;
}
/*
// Parse the dependency line.
if(!this->ParseDependency(line.c_str()))
{
continue;
}
*/
// Dependencies must be regenerated if the dependee does not exist
// or if the depender exists and is older than the dependee.
bool regenerate = false;
const char* dependee = m_Dependee+1;
const char* depender = m_Depender;
if(!cmSystemTools::FileExists(dependee))
{
// The dependee does not exist.
regenerate = true;
// Print verbose output.
if(m_Verbose)
{
cmOStringStream msg;
msg << "Dependee \"" << dependee
<< "\" does not exist for depender \""
<< depender << "\"." << std::endl;
cmSystemTools::Stdout(msg.str().c_str());
}
}
else if(cmSystemTools::FileExists(depender))
{
// The dependee and depender both exist. Compare file times.
int result = 0;
if((!m_FileComparison->FileTimeCompare(depender, dependee,
&result) || result < 0))
{
// The depender is older than the dependee.
regenerate = true;
// Print verbose output.
if(m_Verbose)
{
cmOStringStream msg;
msg << "Dependee \"" << dependee
<< "\" is newer than depender \""
<< depender << "\"." << std::endl;
cmSystemTools::Stdout(msg.str().c_str());
}
}
}
if(regenerate)
{
// Dependencies must be regenerated.
okay = false;
// Remove the depender to be sure it is rebuilt.
cmSystemTools::RemoveFile(depender);
}
}
return okay;
}
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