[clang] [clang][NFC] Add test for CWG issues about linkage in cross-TU context (PR #113736)
Vlad Serebrennikov via cfe-commits
cfe-commits at lists.llvm.org
Mon Oct 28 03:07:13 PDT 2024
================
@@ -0,0 +1,548 @@
+// RUN: rm -rf %t
+// RUN: mkdir %t
+// RUN: split-file --leading-lines %s %t
+// RUN: %clang_cc1 -std=c++20 -pedantic-errors -fexceptions -fcxx-exceptions %t/cwg1884_A.cppm -triple x86_64-unknown-unknown -emit-module-interface -o %t/cwg1884_A.pcm
+// RUN: %clang_cc1 -std=c++20 -verify=since-cxx20 -pedantic-errors -fexceptions -fcxx-exceptions -triple x86_64-unknown-unknown %t/cwg1884.cpp -fmodule-file=cwg1884_A=%t/cwg1884_A.pcm
+// RUN: %clang_cc1 -std=c++23 -pedantic-errors -fexceptions -fcxx-exceptions %t/cwg1884_A.cppm -triple x86_64-unknown-unknown -emit-module-interface -o %t/cwg1884_A.pcm
+// RUN: %clang_cc1 -std=c++23 -verify=since-cxx20 -pedantic-errors -fexceptions -fcxx-exceptions -triple x86_64-unknown-unknown %t/cwg1884.cpp -fmodule-file=cwg1884_A=%t/cwg1884_A.pcm
+// RUN: %clang_cc1 -std=c++2c -pedantic-errors -fexceptions -fcxx-exceptions %t/cwg1884_A.cppm -triple x86_64-unknown-unknown -emit-module-interface -o %t/cwg1884_A.pcm
+// RUN: %clang_cc1 -std=c++2c -verify=since-cxx20 -pedantic-errors -fexceptions -fcxx-exceptions -triple x86_64-unknown-unknown %t/cwg1884.cpp -fmodule-file=cwg1884_A=%t/cwg1884_A.pcm
+
+// cwg1884: partial
+
+// _N4993_.[basic.link]/11:
+// For any two declarations of an entity E:
+// — If one declares E to be a variable or function,
+// the other shall declare E as one of the same type.
+// — If one declares E to be an enumerator, the other shall do so.
+// — If one declares E to be a namespace, the other shall do so.
+// — If one declares E to be a type,
+// the other shall declare E to be a type of the same kind (9.2.9.5).
+// — If one declares E to be a class template,
+// the other shall do so with the same kind and an equivalent template-head (13.7.7.2).
+// [Note 5 : The declarations can supply different default template arguments. — end note]
+// — If one declares E to be a function template or a (partial specialization of a) variable template,
+// the other shall declare E to be one with an equivalent template-head and type.
+// — If one declares E to be an alias template,
+// the other shall declare E to be one with an equivalent template-head and defining-type-id.
+// — If one declares E to be a concept, the other shall do so.
+// Types are compared after all adjustments of types (during which typedefs (9.2.4) are replaced by their definitions);
+// declarations for an array object can specify array types that differ by the presence or absence of a major array bound (9.3.4.5).
+// No diagnostic is required if neither declaration is reachable from the other.
+
+// The structure of the test is the following. First, module cwg1884_A
+// provides all (significant) kinds of entities, each named 'a' through 'k'.
+// Then the .cpp file does MxN kind of testing, where it tests one kind of entity
+// against every other kind.
+
+//--- cwg1884_A.cppm
+export module cwg1884_A;
+
+export {
+int a;
+void b();
+enum E { c };
+namespace d {}
+struct e;
+class f;
+template <typename>
+class g;
+template <typename>
+void h(int);
+template <typename, typename>
+int i;
+template <typename>
+using j = int;
+template <typename>
+concept k = true;
+} // export
+
+
+//--- cwg1884.cpp
+import cwg1884_A;
+
+// int a;
+
+void a();
+// since-cxx20-error at -1 {{redefinition of 'a' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:42 {{previous definition is here}}
+enum Ea {
+ a
+ // since-cxx20-error at -1 {{redefinition of 'a'}}
+ // since-cxx20-note at cwg1884_A.cppm:42 {{previous definition is here}}
+};
+namespace a {} // #cwg1884-namespace-a
+// since-cxx20-error at -1 {{redefinition of 'a' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:42 {{previous definition is here}}
+struct a;
+// since-cxx20-error at -1 {{redefinition of 'a' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-namespace-a {{previous definition is here}}
+class a;
+// since-cxx20-error at -1 {{redefinition of 'a' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-namespace-a {{previous definition is here}}
+template <typename>
+class a;
+// since-cxx20-error at -1 {{redefinition of 'a' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:42 {{previous definition is here}}
+template <typename>
+void a(int);
+// since-cxx20-error at -1 {{redefinition of 'a' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:42 {{previous definition is here}}
+template <typename, typename>
+int a;
+// since-cxx20-error at -1 {{redefinition of 'a' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:42 {{previous definition is here}}
+template <typename T>
+int a<T, int>;
+// since-cxx20-error at -1 {{redefinition of 'a' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:42 {{previous definition is here}}
+// since-cxx20-error at -3 {{expected ';' after top level declarator}}
+template <typename>
+using a = int;
+// since-cxx20-error at -1 {{redefinition of 'a' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:42 {{previous definition is here}}
+template <typename>
+concept a = true;
+// since-cxx20-error at -1 {{redefinition of 'a' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:42 {{previous definition is here}}
+
+
+// void b();
+
+int b;
+// since-cxx20-error at -1 {{redefinition of 'b' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:43 {{previous definition is here}}
+enum Eb {
+ b
+ // since-cxx20-error at -1 {{redefinition of 'b'}}
+ // since-cxx20-note at cwg1884_A.cppm:43 {{previous definition is here}}
+};
+namespace b {} // #cwg1884-namespace-b
+// since-cxx20-error at -1 {{redefinition of 'b' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:43 {{previous definition is here}}
+struct b;
+// since-cxx20-error at -1 {{redefinition of 'b' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-namespace-b {{previous definition is here}}
+class b;
+// since-cxx20-error at -1 {{redefinition of 'b' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-namespace-b {{previous definition is here}}
+template <typename>
+class b;
+// since-cxx20-error at -1 {{redefinition of 'b' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:43 {{previous definition is here}}
+template <typename>
+void b(int); // #cwg1884-func-template-b
+// @-1 OK, a non-corresponding overload
+template <typename, typename>
+int b;
+// since-cxx20-error at -1 {{redefinition of 'b' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-func-template-b {{previous definition is here}}
+template <typename T>
+int b<T, int>;
+// since-cxx20-error at -1 {{no variable template matches specialization; did you mean to use 'b' as function template instead?}}
+template <typename>
+using b = int;
+// since-cxx20-error at -1 {{redefinition of 'b' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:43 {{previous definition is here}}
+template <typename>
+concept b = true;
+// since-cxx20-error at -1 {{redefinition of 'b' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-func-template-b {{previous definition is here}}
+
+
+// enum E { c };
+
+int c;
+// since-cxx20-error at -1 {{redefinition of 'c' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:44 {{previous definition is here}}
+void c();
+// since-cxx20-error at -1 {{redefinition of 'c' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:44 {{previous definition is here}}
+namespace c {} // #cwg1884-namespace-c
+// since-cxx20-error at -1 {{redefinition of 'c' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:44 {{previous definition is here}}
+struct c;
+// since-cxx20-error at -1 {{redefinition of 'c' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-namespace-c {{previous definition is here}}
+class c;
+// since-cxx20-error at -1 {{redefinition of 'c' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-namespace-c {{previous definition is here}}
+template <typename>
+class c;
+// since-cxx20-error at -1 {{redefinition of 'c' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:44 {{previous definition is here}}
+template <typename>
+void c(int);
+// since-cxx20-error at -1 {{redefinition of 'c' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:44 {{previous definition is here}}
+template <typename, typename>
+int c;
+// since-cxx20-error at -1 {{redefinition of 'c' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:44 {{previous definition is here}}
+template <typename T>
+int c<T, int>;
+// since-cxx20-error at -1 {{redefinition of 'c' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:44 {{previous definition is here}}
+// since-cxx20-error at -3 {{expected ';' after top level declarator}}
+template <typename>
+using c = int;
+// since-cxx20-error at -1 {{redefinition of 'c' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:44 {{previous definition is here}}
+template <typename>
+concept c = true;
+// since-cxx20-error at -1 {{redefinition of 'c' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:44 {{previous definition is here}}
+
+
+// namespace d {};
+
+int d;
+// since-cxx20-error at -1 {{redefinition of 'd' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:45 {{previous definition is here}}
+void d();
+// since-cxx20-error at -1 {{redefinition of 'd' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:45 {{previous definition is here}}
+enum Ed {
+ d
+ // since-cxx20-error at -1 {{redefinition of 'd'}}
+ // since-cxx20-note at cwg1884_A.cppm:45 {{previous definition is here}}
+};
+struct d;
+// since-cxx20-error at -1 {{redefinition of 'd' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:45 {{previous definition is here}}
+class d;
+// since-cxx20-error at -1 {{redefinition of 'd' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:45 {{previous definition is here}}
+template <typename>
+class d;
+// since-cxx20-error at -1 {{redefinition of 'd' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:45 {{previous definition is here}}
+template <typename>
+void d(int);
+// since-cxx20-error at -1 {{redefinition of 'd' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:45 {{previous definition is here}}
+template <typename, typename>
+int d;
+// since-cxx20-error at -1 {{redefinition of 'd' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:45 {{previous definition is here}}
+template <typename T>
+int d<T, int>;
+// since-cxx20-error at -1 {{redefinition of 'd' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:45 {{previous definition is here}}
+// since-cxx20-error at -3 {{expected ';' after top level declarator}}
+template <typename>
+using d = int;
+// since-cxx20-error at -1 {{redefinition of 'd' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:45 {{previous definition is here}}
+template <typename>
+concept d = true;
+// since-cxx20-error at -1 {{redefinition of 'd' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:45 {{previous definition is here}}
+
+
+// struct e;
+
+int e; // #cwg1884-int-e
+// @-1 OK, types and variables do not correspond
+void e();
+// since-cxx20-error at -1 {{redefinition of 'e' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-e {{previous definition is here}}
+enum Ee {
+ e
+ // since-cxx20-error at -1 {{redefinition of 'e'}}
+ // since-cxx20-note@#cwg1884-int-e {{previous definition is here}}
+};
+namespace e {} // #cwg1884-namespace-e
+// since-cxx20-error at -1 {{redefinition of 'e' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-e {{previous definition is here}}
+class e;
+// since-cxx20-error at -1 {{declaration of 'e' in the global module follows declaration in module cwg1884_A}}
+// since-cxx20-note at cwg1884_A.cppm:46 {{previous declaration is here}}
+template <typename>
+class e;
+// since-cxx20-error at -1 {{redefinition of 'e' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-e {{previous definition is here}}
+template <typename>
+void e(int);
+// since-cxx20-error at -1 {{redefinition of 'e' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-e {{previous definition is here}}
+template <typename, typename>
+int e;
+// since-cxx20-error at -1 {{redefinition of 'e' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-e {{previous definition is here}}
+template <typename T>
+int e<T, int>;
+// since-cxx20-error at -1 {{redefinition of 'e' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-e {{previous definition is here}}
+// since-cxx20-error at -3 {{expected ';' after top level declarator}}
+template <typename>
+using e = int;
+// since-cxx20-error at -1 {{redefinition of 'e' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-e {{previous definition is here}}
+template <typename>
+concept e = true;
+// since-cxx20-error at -1 {{redefinition of 'e' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-e {{previous definition is here}}
+
+
+// class f;
+
+int f; // #cwg1884-int-f
+// @-1 OK, types and variables do not correspond
+void f();
+// since-cxx20-error at -1 {{redefinition of 'f' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-f {{previous definition is here}}
+enum Ef {
+ f
+ // since-cxx20-error at -1 {{redefinition of 'f'}}
+ // since-cxx20-note@#cwg1884-int-f {{previous definition is here}}
+};
+namespace f {} // #cwg1884-namespace-f
+// since-cxx20-error at -1 {{redefinition of 'f' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-f {{previous definition is here}}
+struct f;
+// since-cxx20-error at -1 {{declaration of 'f' in the global module follows declaration in module cwg1884_A}}
+// since-cxx20-note at cwg1884_A.cppm:47 {{previous declaration is here}}
+template <typename>
+class f;
+// since-cxx20-error at -1 {{redefinition of 'f' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-f {{previous definition is here}}
+template <typename>
+void f(int);
+// since-cxx20-error at -1 {{redefinition of 'f' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-f {{previous definition is here}}
+template <typename, typename>
+int f;
+// since-cxx20-error at -1 {{redefinition of 'f' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-f {{previous definition is here}}
+template <typename T>
+int f<T, int>;
+// since-cxx20-error at -1 {{redefinition of 'f' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-f {{previous definition is here}}
+// since-cxx20-error at -3 {{expected ';' after top level declarator}}
+template <typename>
+using f = int;
+// since-cxx20-error at -1 {{redefinition of 'f' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-f {{previous definition is here}}
+template <typename>
+concept f = true;
+// since-cxx20-error at -1 {{redefinition of 'f' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-int-f {{previous definition is here}}
+
+
+// template <typename>
+// class g;
+
+int g;
+// since-cxx20-error at -1 {{redefinition of 'g' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:49 {{previous definition is here}}
+void g();
+// since-cxx20-error at -1 {{redefinition of 'g' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:49 {{previous definition is here}}
+enum Eg {
+ g
+ // since-cxx20-error at -1 {{redefinition of 'g'}}
+ // since-cxx20-note at cwg1884_A.cppm:49 {{previous definition is here}}
+};
+namespace g {}
+// since-cxx20-error at -1 {{redefinition of 'g' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:49 {{previous definition is here}}
+struct g;
+// since-cxx20-error at -1 {{redefinition of 'g' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:49 {{previous definition is here}}
+class g;
+// since-cxx20-error at -1 {{redefinition of 'g' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:49 {{previous definition is here}}
+template <typename>
+void g(int);
+// since-cxx20-error at -1 {{redefinition of 'g' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:49 {{previous definition is here}}
+template <typename, typename>
+int g;
+// since-cxx20-error at -1 {{redefinition of 'g' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:49 {{previous definition is here}}
+template <typename T>
+int g<T, int>;
+// since-cxx20-error at -1 {{no variable template matches partial specialization}}
+template <typename>
+using g = int;
+// since-cxx20-error at -1 {{redefinition of 'g' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:49 {{previous definition is here}}
+template <typename>
+concept g = true;
+// since-cxx20-error at -1 {{redefinition of 'g' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:49 {{previous definition is here}}
+
+
+// template <typename>
+// void h(int);
+
+int h;
+// since-cxx20-error at -1 {{redefinition of 'h' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:51 {{previous definition is here}}
+void h(); // #cwg1884-function-f
+// @-1 OK, a non-corresponding overload
+enum Eh {
+ h
+ // FIXME-since-cxx20-error at -1 {{redefinition of 'h'}}
+ // FIXME-since-cxx20-note at cwg1884_A.cppm:51 {{previous definition is here}}
+};
+namespace h {} // #cwg1884-namespace-h
+// FIXME-since-cxx20-error at -1 {{redefinition of 'h' as different kind of symbol}}
+// FIXME-since-cxx20-note at cwg1884_A.cppm:51 {{previous definition is here}}
+struct h;
+// since-cxx20-error at -1 {{redefinition of 'h' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-namespace-h {{previous definition is here}}
+class h;
+// since-cxx20-error at -1 {{redefinition of 'h' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-namespace-h {{previous definition is here}}
+template <typename>
+class h;
+// FIXME-since-cxx20-error at -1 {{redefinition of 'h' as different kind of symbol}}
+// FIXME-since-cxx20-note at cwg1884_A.cppm:51 {{previous definition is here}}
+template <typename, typename>
+int h;
+// since-cxx20-error at -1 {{redefinition of 'h' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-namespace-h {{previous definition is here}}
+template <typename T>
+int h<T, int>;
+// since-cxx20-error at -1 {{no variable template matches specialization; did you mean to use 'h' as function template instead?}}
+template <typename>
+using h = int;
+// since-cxx20-error at -1 {{redefinition of 'h' as different kind of symbol}}
+// since-cxx20-note at cwg1884_A.cppm:51 {{previous definition is here}}
+template <typename>
+concept h = true;
+// since-cxx20-error at -1 {{redefinition of 'h' as different kind of symbol}}
+// since-cxx20-note@#cwg1884-function-f {{previous definition is here}}
+
+
+// template <typename, typename>
+// int i;
+
----------------
Endilll wrote:
Hopefully the new structure of the test should make it less confusing.
https://github.com/llvm/llvm-project/pull/113736
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