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5030928d60
initializers.
This has some interesting interactions with our existing extensions to
support C99 designated initializers as an extension in C++. Those are
resolved as follows:
* We continue to permit the full breadth of C99 designated initializers
in C++, with the exception that we disallow a partial overwrite of an
initializer with a non-trivially-destructible type. (Full overwrite
is OK, because we won't run the first initializer at all.)
* The C99 extensions are disallowed in SFINAE contexts and during
overload resolution, where they could change the meaning of valid
programs.
* C++20 disallows reordering of initializers. We only check for that for
the simple cases that the C++20 rules permit (designators of the form
'.field_name =' and continue to allow reordering in other cases).
It would be nice to improve this behavior in future.
* All C99 designated initializer extensions produce a warning by
default in C++20 mode. People are going to learn the C++ rules based
on what Clang diagnoses, so it's important we diagnose these properly
by default.
* In C++ <= 17, we apply the C++20 rules rather than the C99 rules, and
so still diagnose C99 extensions as described above. We continue to
accept designated C++20-compatible initializers in C++ <= 17 silently
by default (but naturally still reject under -pedantic-errors).
This is not a complete implementation of P0329R4. In particular, that
paper introduces new non-C99-compatible syntax { .field { init } }, and
we do not support that yet.
This is based on a previous patch by Don Hinton, though I've made
substantial changes when addressing the above interactions.
Differential Revision: https://reviews.llvm.org/D59754
llvm-svn: 370544
71 lines
2.0 KiB
Objective-C
71 lines
2.0 KiB
Objective-C
// RUN: %clang_cc1 -fsyntax-only -fobjc-runtime=macosx-fragile -verify -pedantic -Wno-objc-root-class %s
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// RUN: %clang_cc1 -fsyntax-only -fobjc-runtime=macosx-fragile -verify -x objective-c++ -Wno-c99-designator -Wno-objc-root-class %s
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// RUN: %clang_cc1 -fsyntax-only -fobjc-runtime=macosx-fragile -verify -x objective-c++ -Wno-c99-designator -Wno-objc-root-class -std=c++98 %s
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// RUN: %clang_cc1 -fsyntax-only -fobjc-runtime=macosx-fragile -verify -x objective-c++ -Wno-c99-designator -Wno-objc-root-class -std=c++11 %s
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// rdar://5707001
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@interface NSNumber;
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- () METH;
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- (unsigned) METH2;
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@end
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struct SomeStruct {
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int x, y, z, q;
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};
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void test1() {
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id objects[] = {[NSNumber METH]};
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}
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void test2(NSNumber x) { // expected-error {{interface type 'NSNumber' cannot be passed by value; did you forget * in 'NSNumber'}}
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id objects[] = {[x METH]};
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}
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void test3(NSNumber *x) {
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id objects[] = {[x METH]};
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}
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// rdar://5977581
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void test4() {
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unsigned x[] = {[NSNumber METH2]+2};
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}
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void test5(NSNumber *x) {
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unsigned y[] = {
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[4][NSNumber METH2]+2, // expected-warning {{use of GNU 'missing =' extension in designator}}
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[4][x METH2]+2 // expected-warning {{use of GNU 'missing =' extension in designator}}
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};
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struct SomeStruct z = {
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.x = [x METH2], // ok in C++98.
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#if __cplusplus >= 201103L
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// expected-error@-2 {{non-constant-expression cannot be narrowed from type 'unsigned int' to 'int' in initializer list}}
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// expected-note@-3 {{insert an explicit cast to silence this issue}}
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#endif
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.x [x METH2] // expected-error {{expected '=' or another designator}}
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#if __cplusplus >= 201103L
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// expected-error@-2 {{non-constant-expression cannot be narrowed from type 'unsigned int' to 'int' in initializer list}}
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// expected-note@-3 {{insert an explicit cast to silence this issue}}
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#endif
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};
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}
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// rdar://7370882
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@interface SemicolonsAppDelegate
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{
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id i;
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}
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@property (assign) id window;
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@end
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@implementation SemicolonsAppDelegate
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{
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id i;
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}
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@synthesize window=i;
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@end
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