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[OpenCL] Suppress -Wreturn-stack-address for function-scope local variable (#181602)

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OpenCL local variable has lifetime of work-group, not function call stack.
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Wenju He 2026-02-20 10:08:25 +08:00 committed by GitHub
parent 2e989bd595
commit ede47a3b13
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2 changed files with 16 additions and 0 deletions
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3
clang/lib/Sema/CheckExprLifetime.cpp
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@ -1337,6 +1337,9 @@ checkExprLifetimeImpl(Sema &SemaRef, const InitializedEntity *InitEntity,
// expression.
if (LK == LK_StmtExprResult)
return false;
if (auto *VD = dyn_cast<VarDecl>(DRE->getDecl()))
if (VD->getType().getAddressSpace() == LangAS::opencl_local)
return false;
SemaRef.Diag(DiagLoc, diag::warn_ret_stack_addr_ref)
<< InitEntity->getType()->isReferenceType() << DRE->getDecl()
<< isa<ParmVarDecl>(DRE->getDecl()) << (LK == LK_MustTail)

13
clang/test/SemaOpenCL/function-scope-local-return.cl Normal file
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@ -0,0 +1,13 @@
// RUN: %clang_cc1 %s -verify -pedantic -fsyntax-only -cl-std=CL3.0
// Check that returning a pointer to a local address space variable does not
// trigger -Wreturn-stack-address.
// expected-no-diagnostics
#pragma OPENCL EXTENSION __cl_clang_function_scope_local_variables : enable
local int* get_group_scratch() {
local int data[64];
return data;
}