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45 lines
1.5 KiB
45 lines
1.5 KiB
4 months ago
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// RUN: %clang_cc1 -fsyntax-only -verify -std=c++1y %s
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// expected-no-diagnostics
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// C++11 [basic.link]p6:
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// The name of a function declared in block scope and the name
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// of a variable declared by a block scope extern declaration
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// have linkage. If there is a visible declaration of an entity
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// with linkage having the same name and type, ignoring entities
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// declared outside the innermost enclosing namespace scope, the
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// block scope declaration declares that same entity and
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// receives the linkage of the previous declaration.
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extern int same_entity;
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constexpr int *get1() {
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int same_entity = 0; // not the same entity
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{
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extern int same_entity;
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return &same_entity;
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}
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}
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static_assert(get1() == &same_entity, "failed to find previous decl");
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static int same_entity_2[3];
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constexpr int *get2() {
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// This is a redeclaration of the same entity, even though it doesn't
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// inherit the type of the prior declaration.
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extern int same_entity_2[];
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return same_entity_2;
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}
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static_assert(get2() == same_entity_2, "failed to find previous decl");
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static int different_entities;
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constexpr int *get3() {
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int different_entities = 0;
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{
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// FIXME: This is not a redeclaration of the prior entity, because
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// it is not visible here. Under DR426, this is ill-formed, and without
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// it, the static_assert below should fail.
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extern int different_entities;
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return &different_entities;
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}
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}
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static_assert(get3() == &different_entities, "failed to find previous decl");
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