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Tablegen should only replace the output if it changes 

llvm-svn: 7486
This commit is contained in:
Chris Lattner 2003-08-01 20:35:01 +00:00
parent c0eb77c24c
commit 7700cb6cd2
1 changed files with 18 additions and 4 deletions
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22
llvm/support/tools/TableGen/TableGen.cpp
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@ -11,6 +11,7 @@
#include "Record.h"
#include "Support/CommandLine.h"
#include "Support/Signals.h"
#include "Support/FileUtilities.h"
#include "CodeEmitterGen.h"
#include "RegisterInfoEmitter.h"
#include <algorithm>
@ -391,15 +392,18 @@ int main(int argc, char **argv) {
std::ostream *Out = &std::cout;
if (OutputFilename != "-") {
Out = new std::ofstream(OutputFilename.c_str());
// Output to a .tmp file, because we don't actually want to overwrite the
// output file unless the generated file is different or the specified file
// does not exist.
Out = new std::ofstream((OutputFilename+".tmp").c_str());
if (!Out->good()) {
std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
std::cerr << argv[0] << ": error opening " << OutputFilename << ".tmp!\n";
return 1;
}
// Make sure the file gets removed if *gasp* tablegen crashes...
RemoveFileOnSignal(OutputFilename);
RemoveFileOnSignal(OutputFilename+".tmp");
}
try {
@ -438,6 +442,16 @@ int main(int argc, char **argv) {
return 1;
}
if (Out != &std::cout) delete Out;
if (Out != &std::cout) {
delete Out; // Close the file
// Now that we have generated the result, check to see if we either don't
// have the requested file, or if the requested file is different than the
// file we generated. If so, move the generated file over the requested
// file. Otherwise, just remove the file we just generated, so 'make'
// doesn't try to regenerate tons of dependencies.
//
MoveFileOverIfUpdated(OutputFilename+".tmp", OutputFilename);
}
return 0;
}