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An attempt to reduce file accesses during the .swiftdeps file generation.

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This commit is contained in:
Hiroshi Yamauchi
2025-01-21 12:36:55 -08:00
parent e767b74790
commit 30d298a70c
1 changed files with 3 additions and 1 deletions
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4
lib/FrontendTool/FrontendTool.cpp
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@@ -492,10 +492,12 @@ static bool emitReferenceDependencies(CompilerInstance &Instance,
.getLangOptions()
.EmitFineGrainedDependencySourcefileDotFiles;
#ifndef NDEBUG
// Before writing to the dependencies file path, preserve any previous file
// that may have been there. No error handling -- this is just a nicety, it
// doesn't matter if it fails.
llvm::sys::fs::rename(outputPath, outputPath + "~");
#endif
using SourceFileDepGraph = fine_grained_dependencies::SourceFileDepGraph;
return fine_grained_dependencies::withReferenceDependencies(
@@ -507,7 +509,7 @@ static bool emitReferenceDependencies(CompilerInstance &Instance,
g);
// If path is stdout, cannot read it back, so check for "-"
assert(outputPath == "-" || g.verifyReadsWhatIsWritten(outputPath));
DEBUG_ASSERT(outputPath == "-" || g.verifyReadsWhatIsWritten(outputPath));
if (alsoEmitDotFile)
g.emitDotFile(Instance.getOutputBackend(), outputPath,