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2e87a21c7c
Summary:
Clang typically warns that in the following class hierarchy, 'A' is
inaccessible because there is no series of casts that the user can
write to access it unambiguously:
struct A { };
struct B : A { };
struct C : A, B { };
MSVC allows the user to convert from C* to A*, though, and we've
encountered this issue in the latest Windows SDK headers.
This patch allows this conversion when -fms-compatibility is set and
adds a warning for it under -Wmicrosoft-inaccessible-base.
Reviewers: rsmith
Subscribers: cfe-commits
Differential Revision: https://reviews.llvm.org/D39389
llvm-svn: 316807
52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify %s
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// RUN: %clang_cc1 -DMS -fms-compatibility -Wmicrosoft-inaccessible-base -fsyntax-only -verify %s
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struct A {
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int a;
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};
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struct X1 : virtual A
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{};
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struct Y1 : X1, virtual A
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{};
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struct Y2 : X1, A // expected-warning{{direct base 'A' is inaccessible due to ambiguity:\n struct Y2 -> struct X1 -> struct A\n struct Y2 -> struct A}}
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{};
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struct X2 : A
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{};
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struct Z1 : X2, virtual A // expected-warning{{direct base 'A' is inaccessible due to ambiguity:\n struct Z1 -> struct X2 -> struct A\n struct Z1 -> struct A}}
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{};
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struct Z2 : X2, A // expected-warning{{direct base 'A' is inaccessible due to ambiguity:\n struct Z2 -> struct X2 -> struct A\n struct Z2 -> struct A}}
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{};
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A *y2_to_a(Y2 *p) {
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#ifdef MS
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// expected-warning@+4 {{accessing inaccessible direct base 'A' of 'Y2' is a Microsoft extension}}
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#else
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// expected-error@+2 {{ambiguous conversion}}
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#endif
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return p;
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}
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A *z1_to_a(Z1 *p) {
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#ifdef MS
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// expected-warning@+4 {{accessing inaccessible direct base 'A' of 'Z1' is a Microsoft extension}}
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#else
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// expected-error@+2 {{ambiguous conversion}}
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#endif
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return p;
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}
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A *z1_to_a(Z2 *p) {
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#ifdef MS
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// expected-warning@+4 {{accessing inaccessible direct base 'A' of 'Z2' is a Microsoft extension}}
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#else
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// expected-error@+2 {{ambiguous conversion}}
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#endif
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return p;
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}
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