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Fix #14643, #10965, #11704: false positive: unreadVariable for constructors with unknown side effects #8420

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Merged
ludviggunne merged 3 commits into from
Apr 14, 2026
+36 −0
Merged

Fix #14643, #10965, #11704: false positive: unreadVariable for constructors with unknown side effects #8420

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c209a77
Add test
ludviggunne Apr 7, 2026
7649f99
fix #14643
ludviggunne Apr 7, 2026
887353d
Add tests for other tickets
ludviggunne Apr 8, 2026
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8 changes: 8 additions & 0 deletions lib/checkunusedvar.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1352,6 +1352,14 @@ void CheckUnusedVar::checkFunctionVariableUsage()
if (tok->previous() && tok->previous()->variable() && tok->previous()->variable()->nameToken()->scope()->type == ScopeType::eUnion)
continue;

if (expr->valueType() &&
expr->valueType()->type == ValueType::RECORD &&
!expr->valueType()->pointer &&
expr->valueType()->typeScope &&
expr->valueType()->typeScope->definedType &&
!symbolDatabase->isRecordTypeWithoutSideEffects(expr->valueType()->typeScope->definedType))
continue;

FwdAnalysis fwdAnalysis(*mSettings);
const Token* scopeEnd = ValueFlow::getEndOfExprScope(expr, scope, /*smallest*/ false);
if (fwdAnalysis.unusedValue(expr, start, scopeEnd)) {
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4 changes: 4 additions & 0 deletions test/testunusedvar.cpp
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Expand Up @@ -6681,6 +6681,10 @@ class TestUnusedVar : public TestFixture {
" C c(12);\n"
"}");
ASSERT_EQUALS("", errout_str());

functionVariableUsage("class S { S(int); };\n"
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"void f() { S s = 0; }\n");
ASSERT_EQUALS("", errout_str());
}

void localVarSmartPtr() {
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