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Fix auto type-specifier conflict crash #209308

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Merged
cor3ntin merged 1 commit into from
Jul 14, 2026
+4 −0
Merged

Fix auto type-specifier conflict crash #209308

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1 change: 1 addition & 0 deletions clang/lib/Sema/DeclSpec.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1349,6 +1349,7 @@ void DeclSpec::CheckTypeSpec(Sema &S, const PrintingPolicy &Policy) {
}
// Mark as error to prevent further processing
TypeSpecType = TST_error;
TypeSpecOwned = false;
} else if (!S.getLangOpts().CPlusPlus) {
// For C, C23, etc., convert 'auto' to storage class specifier
// (This is already handled above for C23, but keep for other C dialects)
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3 changes: 3 additions & 0 deletions clang/test/SemaCXX/auto-cxx0x.cpp
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Expand Up @@ -11,6 +11,9 @@ void f() {
auto int arr[10]; // expected-error {{'auto' cannot be combined with a type specifier}}
}

struct PR209000 {
} auto; // expected-error {{'auto' cannot be combined with a type specifier}}

typedef auto PR25449(); // expected-error {{'auto' not allowed in typedef}}

thread_local auto x; // expected-error {{requires an initializer}}
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