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[clang] Diagnose [[nodiscard]] return types in Objective-C++ #142541
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c683b2a
[clang] [test] More coverage of [[nodiscard]]
halbi2 0c5aa22
[clang] Diagnose nodiscard return types in Objective-C++
halbi2 c0e5f84
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halbi2 9bad608
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halbi2 32987a8
Refactor out Expr::getUnusedResultAttrImpl
halbi2 c2dee93
Merge remote-tracking branch 'upstream/main' into diagno
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,25 @@ | ||
// RUN: %clang_cc1 -fsyntax-only -verify %s | ||
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struct [[nodiscard]] expected {}; | ||
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typedef struct expected E; | ||
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@interface INTF | ||
- (int) a [[nodiscard]]; | ||
+ (int) b [[nodiscard]]; | ||
- (struct expected) c; | ||
+ (struct expected) d; | ||
- (E) e; | ||
+ (E) f; | ||
- (void) g [[nodiscard]]; // expected-warning {{attribute 'nodiscard' cannot be applied to Objective-C method without return value}} | ||
@end | ||
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void foo(INTF *a) { | ||
[a a]; // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
[INTF b]; // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
[a c]; // expected-warning {{ignoring return value of type 'expected' declared with 'nodiscard' attribute}} | ||
[INTF d]; // expected-warning {{ignoring return value of type 'expected' declared with 'nodiscard' attribute}} | ||
[a e]; // expected-warning {{ignoring return value of type 'expected' declared with 'nodiscard' attribute}} | ||
[INTF f]; // expected-warning {{ignoring return value of type 'expected' declared with 'nodiscard' attribute}} | ||
[a g]; | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,26 @@ | ||
// RUN: %clang_cc1 -fsyntax-only -verify %s | ||
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template<class T> | ||
struct [[nodiscard]] expected {}; | ||
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using E = expected<int>; | ||
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@interface INTF | ||
- (int) a [[nodiscard]]; | ||
+ (int) b [[nodiscard]]; | ||
- (expected<int>) c; | ||
+ (expected<int>) d; | ||
- (E) e; | ||
+ (E) f; | ||
- (void) g [[nodiscard]]; // expected-warning {{attribute 'nodiscard' cannot be applied to Objective-C method without return value}} | ||
@end | ||
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void foo(INTF *a) { | ||
[a a]; // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
[INTF b]; // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} | ||
[a c]; // expected-warning {{ignoring return value of type 'expected<int>' declared with 'nodiscard' attribute}} | ||
[INTF d]; // expected-warning {{ignoring return value of type 'expected<int>' declared with 'nodiscard' attribute}} | ||
[a e]; // expected-warning {{ignoring return value of type 'expected<int>' declared with 'nodiscard' attribute}} | ||
[INTF f]; // expected-warning {{ignoring return value of type 'expected<int>' declared with 'nodiscard' attribute}} | ||
[a g]; | ||
} |
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Can you forward-declare WarnUnusedResultAttr instead?