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[clang][Dependency Scanning] Canonicalize Defines of a Compiler Invocation As Early As Possible #159620

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Merged
merged 3 commits into from
Sep 18, 2025
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[clang][Dependency Scanning] Canonicalize Defines of a Compiler Invocation As Early As Possible #159620

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250d52d
Making sure the scanning `CompilerInvocation`'s `-D`s are canonicalized.
qiongsiwu Sep 18, 2025
6520631
Adding a test to check number of scanning module variants.
qiongsiwu Sep 18, 2025
ec423db
Update clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
qiongsiwu Sep 18, 2025
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7 changes: 5 additions & 2 deletions clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -391,10 +391,13 @@ class DependencyScanningAction {
IntrusiveRefCntPtr<llvm::vfs::FileSystem> FS,
std::shared_ptr<PCHContainerOperations> PCHContainerOps,
DiagnosticConsumer *DiagConsumer) {
// Making sure that we canonicalize the defines before we create the deep
// copy.
if (any(Service.getOptimizeArgs() & ScanningOptimizations::Macros))
canonicalizeDefines(Invocation->getPreprocessorOpts());

// Make a deep copy of the original Clang invocation.
CompilerInvocation OriginalInvocation(*Invocation);
if (any(Service.getOptimizeArgs() & ScanningOptimizations::Macros))
canonicalizeDefines(OriginalInvocation.getPreprocessorOpts());

if (Scanned) {
// Scanning runs once for the first -cc1 invocation in a chain of driver
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