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[Clang][Sema] Fix regression due to missing ambiguity check before attempting access check. #80730

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Feb 5, 2024
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[Clang][Sema] Fix regression due to missing ambiguity check before attempting access check. #80730

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3 changes: 2 additions & 1 deletion clang/include/clang/Sema/Lookup.h
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Original file line number Diff line number Diff line change
Expand Up @@ -754,7 +754,8 @@ class LookupResult {

private:
void diagnoseAccess() {
if (isClassLookup() && getSema().getLangOpts().AccessControl)
if (!isAmbiguous() && isClassLookup() &&
getSema().getLangOpts().AccessControl)
getSema().CheckLookupAccess(*this);
}

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22 changes: 22 additions & 0 deletions clang/test/CXX/class.derived/class.member.lookup/p11.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -23,3 +23,25 @@ struct D: I1, I2, B2 {
int D::* mpD = &D::i; // expected-error {{non-static member 'i' found in multiple base-class subobjects of type 'B1'}}
}
};

namespace GH80435 {
struct A {
void *data; // expected-note {{member found by ambiguous name lookup}}
};

class B {
void *data; // expected-note {{member found by ambiguous name lookup}}
};

struct C : A, B {};

decltype(C().data) x; // expected-error {{member 'data' found in multiple base classes of different types}}

struct D { // expected-note {{candidate constructor (the implicit copy constructor) not viable: no known conversion from 'C' to 'const D' for 1st argument}}
// expected-note@-1{{candidate constructor (the implicit move constructor) not viable: no known conversion from 'C' to 'D' for 1st argument}}
template <typename Container, decltype(Container().data) = 0 >
D(Container); // expected-note {{candidate template ignored: substitution failure [with Container = C]: member 'data' found in multiple base classes of different types}}
};

D y(C{}); // expected-error {{no matching constructor for initialization of 'D'}}
}
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