CMake/Source/cmFindPackageCommand.cxx

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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.
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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 "cmFindPackageCommand.h"
#include <cmsys/RegularExpression.hxx>
#include "cmVariableWatch.h"
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void cmFindPackageNeedBackwardsCompatibility(const std::string& variable,
int access_type, void* )
{
if(access_type == cmVariableWatch::UNKNOWN_VARIABLE_READ_ACCESS)
{
std::string message = "An attempt was made to access a variable: ";
message += variable;
message +=
" that has not been defined. This variable is created by the "
"FIND_PACKAGE command. CMake version 1.6 always converted the "
"variable name to upper-case, but this behavior is no longer the "
"case. To fix this you might need to set the cache value of "
"CMAKE_BACKWARDS_COMPATIBILITY to 1.6 or less. If you are writing a "
"CMake listfile, you should change the variable reference to use "
"the case of the argument to FIND_PACKAGE.";
cmSystemTools::Error(message.c_str());
}
}
//----------------------------------------------------------------------------
bool cmFindPackageCommand::InitialPass(std::vector<std::string> const& args)
{
if(args.size() < 1)
{
this->SetError("called with incorrect number of arguments");
return false;
}
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this->Name = args[0];
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bool quiet = false;
bool required = false;
if(args.size() > 1)
{
cmsys::RegularExpression version("^[0-9.]+$");
bool haveVersion = false;
for(unsigned int i=1; i < args.size(); ++i)
{
if(!haveVersion && version.find(args[i].c_str()))
{
haveVersion = true;
}
else if(args[i] == "QUIET")
{
quiet = true;
}
else if(args[i] == "REQUIRED")
{
required = true;
}
else
{
cmOStringStream e;
e << "called with invalid argument \"" << args[i].c_str() << "\"";
this->SetError(e.str().c_str());
return false;
}
}
}
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// See if there is a Find<name>.cmake module.
bool foundModule = false;
if(!this->FindModule(foundModule, quiet, required))
{
return false;
}
if(foundModule)
{
return true;
}
// No find module. Assume the project has a CMake config file. Use
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// a <NAME>_DIR cache variable to locate it.
this->Variable = this->Name;
this->Variable += "_DIR";
this->Config = this->Name;
this->Config += "Config.cmake";
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// Support old capitalization behavior.
std::string upperDir = cmSystemTools::UpperCase(this->Name);
std::string upperFound = cmSystemTools::UpperCase(this->Name);
upperDir += "_DIR";
upperFound += "_FOUND";
bool needCompatibility = false;
if(!(upperDir == this->Variable))
{
const char* versionValue =
m_Makefile->GetDefinition("CMAKE_BACKWARDS_COMPATIBILITY");
if(atof(versionValue) < 1.7)
{
needCompatibility = true;
}
}
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// Try to find the config file.
const char* def = m_Makefile->GetDefinition(this->Variable.c_str());
if(needCompatibility && cmSystemTools::IsOff(def))
{
// Use the setting of the old name of the variable to provide the
// value of the new.
const char* oldDef = m_Makefile->GetDefinition(upperDir.c_str());
if(!cmSystemTools::IsOff(oldDef))
{
m_Makefile->AddDefinition(this->Variable.c_str(), oldDef);
def = m_Makefile->GetDefinition(this->Variable.c_str());
}
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}
if(cmSystemTools::IsOff(def))
{
if(!this->FindConfig())
{
return false;
}
}
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// If the config file was found, load it.
bool result = true;
bool found = false;
def = m_Makefile->GetDefinition(this->Variable.c_str());
if(!cmSystemTools::IsOff(def))
{
std::string f = def;
f += "/";
f += this->Config;
if(cmSystemTools::FileExists(f.c_str()))
{
if(this->ReadListFile(f.c_str()))
{
found = true;
}
else
{
result = false;
}
}
else
{
cmOStringStream e;
e << this->Variable << " is set to \"" << def << "\", which is "
<< "not a directory containing " << this->Config;
cmSystemTools::Error(e.str().c_str());
if(required)
{
cmSystemTools::SetFatalErrorOccured();
}
result = true;
}
}
else if(!quiet || required)
{
cmOStringStream e;
e << this->Variable << " is not set. It must be set to the directory "
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<< "containing " << this->Config << " in order to use "
<< this->Name << ".";
cmSystemTools::Error(e.str().c_str());
if(required)
{
cmSystemTools::SetFatalErrorOccured();
}
result = true;
}
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// Set a variable marking whether the package was found.
std::string foundVar = this->Name;
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foundVar += "_FOUND";
m_Makefile->AddDefinition(foundVar.c_str(), found? "1":"0");
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if(needCompatibility)
{
// Listfiles will be looking for the capitalized version of the
// name. Provide it.
m_Makefile->AddDefinition(upperDir.c_str(),
m_Makefile->GetDefinition(this->Variable.c_str()));
m_Makefile->AddDefinition(upperFound.c_str(),
m_Makefile->GetDefinition(foundVar.c_str()));
}
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if(!(upperDir == this->Variable))
{
if(needCompatibility)
{
// Listfiles may use the capitalized version of the name.
// Remove any previously added watch.
m_Makefile->GetVariableWatch()->RemoveWatch(
upperDir.c_str(),
cmFindPackageNeedBackwardsCompatibility
);
m_Makefile->GetVariableWatch()->RemoveWatch(
upperFound.c_str(),
cmFindPackageNeedBackwardsCompatibility
);
}
else
{
// Listfiles should not be using the capitalized version of the
// name. Add a watch to warn the user.
m_Makefile->GetVariableWatch()->AddWatch(
upperDir.c_str(),
cmFindPackageNeedBackwardsCompatibility
);
m_Makefile->GetVariableWatch()->AddWatch(
upperFound.c_str(),
cmFindPackageNeedBackwardsCompatibility
);
}
}
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return result;
}
//----------------------------------------------------------------------------
bool cmFindPackageCommand::FindModule(bool& found, bool quiet, bool required)
{
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std::string module = "Find";
module += this->Name;
module += ".cmake";
std::string mfile = m_Makefile->GetModulesFile(module.c_str());
if ( mfile.size() )
{
if(quiet)
{
// Tell the module that is about to be read that it should find
// quietly.
std::string quietly = this->Name;
quietly += "_FIND_QUIETLY";
m_Makefile->AddDefinition(quietly.c_str(), "1");
}
if(required)
{
// Tell the module that is about to be read that it should report
// a fatal error if the package is not found.
std::string req = this->Name;
req += "_FIND_REQUIRED";
m_Makefile->AddDefinition(req.c_str(), "1");
}
// Load the module we found.
found = true;
return this->ReadListFile(mfile.c_str());
}
return true;
}
//----------------------------------------------------------------------------
bool cmFindPackageCommand::FindConfig()
{
std::string help = "The directory containing ";
help += this->Config;
help += ".";
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// Construct the list of relative paths to each prefix to be
// searched.
std::string rel = "/lib/";
rel += cmSystemTools::LowerCase(this->Name);
this->Relatives.push_back(rel);
rel = "/lib/";
rel += this->Name;
this->Relatives.push_back(rel);
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// It is likely that CMake will have recently built the project.
for(int i=1; i <= 10; ++i)
{
cmOStringStream r;
r << "[HKEY_CURRENT_USER\\Software\\Kitware\\CMakeSetup\\Settings\\StartPath;WhereBuild"
<< i << "]";
std::string entry = r.str();
cmSystemTools::ExpandRegistryValues(entry);
cmSystemTools::ConvertToUnixSlashes(entry);
if(cmSystemTools::FileIsDirectory(entry.c_str()))
{
this->Builds.push_back(entry);
}
}
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// The project may be installed. Use the system search path to
// construct a list of possible install prefixes.
std::vector<std::string> systemPath;
cmSystemTools::GetPath(systemPath);
for(std::vector<std::string>::iterator i = systemPath.begin();
i != systemPath.end(); ++i)
{
*i += "/..";
if(cmSystemTools::FileIsDirectory(i->c_str()))
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{
this->Prefixes.push_back(cmSystemTools::CollapseFullPath(i->c_str()));
}
}
#if !defined(WIN32) || defined(__CYGWIN__)
this->Prefixes.push_back("/usr/local");
this->Prefixes.push_back("/usr");
#endif
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// Look for the project's configuration file.
std::string init = this->SearchForConfig();
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// Store the entry in the cache so it can be set by the user.
m_Makefile->AddCacheDefinition(this->Variable.c_str(),
init.c_str(),
help.c_str(),
cmCacheManager::PATH);
return true;
}
//----------------------------------------------------------------------------
std::string cmFindPackageCommand::SearchForConfig() const
{
// Search the build directories.
for(std::vector<cmStdString>::const_iterator b = this->Builds.begin();
b != this->Builds.end(); ++b)
{
std::string f = *b;
f += "/";
f += this->Config;
if(cmSystemTools::FileExists(f.c_str()))
{
return *b;
}
}
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// Search paths relative to each installation prefix.
for(std::vector<cmStdString>::const_iterator p = this->Prefixes.begin();
p != this->Prefixes.end(); ++p)
{
std::string prefix = *p;
for(std::vector<cmStdString>::const_iterator r = this->Relatives.begin();
r != this->Relatives.end(); ++r)
{
std::string dir = prefix;
dir += *r;
std::string f = dir;
f += "/";
f += this->Config;
if(cmSystemTools::FileExists(f.c_str()))
{
return dir;
}
}
}
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return this->Variable + "-NOTFOUND";
}
//----------------------------------------------------------------------------
bool cmFindPackageCommand::ReadListFile(const char* f)
{
if(m_Makefile->ReadListFile(m_Makefile->GetCurrentListFile(), f))
{
return true;
}
std::string e = "Error reading CMake code from \"";
e += f;
e += "\".";
this->SetError(e.c_str());
return false;
}