Commit f074d9f5 authored by Brad King's avatar Brad King
Browse files

ENH: Add undocumented file(DIFFERENT) command

This new command will be used by generated installation scripts to
determine whether an already-installed export file has changed.
parent 254782ed
......@@ -112,6 +112,10 @@ bool cmFileCommand
{
return this->HandleInstallCommand(args);
}
else if ( subCommand == "DIFFERENT" )
{
return this->HandleDifferentCommand(args);
}
else if ( subCommand == "RPATH_CHANGE" || subCommand == "CHRPATH" )
{
return this->HandleRPathChangeCommand(args);
......@@ -830,6 +834,67 @@ bool cmFileCommand::HandleMakeDirectoryCommand(
return true;
}
//----------------------------------------------------------------------------
bool
cmFileCommand::HandleDifferentCommand(std::vector<std::string> const& args)
{
/*
FILE(DIFFERENT <variable> FILES <lhs> <rhs>)
*/
// Evaluate arguments.
const char* file_lhs = 0;
const char* file_rhs = 0;
const char* var = 0;
enum Doing { DoingNone, DoingVar, DoingFileLHS, DoingFileRHS };
Doing doing = DoingVar;
for(unsigned int i=1; i < args.size(); ++i)
{
if(args[i] == "FILES")
{
doing = DoingFileLHS;
}
else if(doing == DoingVar)
{
var = args[i].c_str();
doing = DoingNone;
}
else if(doing == DoingFileLHS)
{
file_lhs = args[i].c_str();
doing = DoingFileRHS;
}
else if(doing == DoingFileRHS)
{
file_rhs = args[i].c_str();
doing = DoingNone;
}
else
{
cmOStringStream e;
e << "DIFFERENT given unknown argument " << args[i];
this->SetError(e.str().c_str());
return false;
}
}
if(!var)
{
this->SetError("DIFFERENT not given result variable name.");
return false;
}
if(!file_lhs || !file_rhs)
{
this->SetError("DIFFERENT not given FILES option with two file names.");
return false;
}
// Compare the files.
const char* result =
cmSystemTools::FilesDiffer(file_lhs, file_rhs)? "1" : "0";
this->Makefile->AddDefinition(var, result);
return true;
}
//----------------------------------------------------------------------------
// File installation helper class.
struct cmFileInstaller
......
......@@ -172,6 +172,7 @@ protected:
bool HandleRPathChangeCommand(std::vector<std::string> const& args);
bool HandleRPathCheckCommand(std::vector<std::string> const& args);
bool HandleRPathRemoveCommand(std::vector<std::string> const& args);
bool HandleDifferentCommand(std::vector<std::string> const& args);
// file(INSTALL ...) related functions
bool HandleInstallCommand(std::vector<std::string> const& args);
......
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