https://github.com/to268 created https://github.com/llvm/llvm-project/pull/68710
When declaring `auto int` at local or file scope, we emit a warning intended for C++11 and later, which is incorrect and confusing in C23. See [Godbolt example](https://godbolt.org/z/j1acGhecd). Now this diagnostic does not show up in C23. >From 89dd9eaa7c7d6f3a2a91ccc4f96656f8e0266a07 Mon Sep 17 00:00:00 2001 From: Guillot Tony <tony.guil...@protonmail.com> Date: Tue, 10 Oct 2023 15:34:55 +0200 Subject: [PATCH] Removed diagnostic auto storage class specifier in C23 --- clang/lib/Parse/ParseDecl.cpp | 2 +- clang/test/C/C2x/n3007.c | 4 ++++ clang/test/Sema/c2x-auto.c | 1 + 3 files changed, 6 insertions(+), 1 deletion(-) diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp index bcc70c04dec91ba..14a28e5a31c57db 100644 --- a/clang/lib/Parse/ParseDecl.cpp +++ b/clang/lib/Parse/ParseDecl.cpp @@ -4042,7 +4042,7 @@ void Parser::ParseDeclarationSpecifiers( if (isKnownToBeTypeSpecifier(GetLookAheadToken(1))) { isInvalid = DS.SetStorageClassSpec(Actions, DeclSpec::SCS_auto, Loc, PrevSpec, DiagID, Policy); - if (!isInvalid) + if (!isInvalid && !getLangOpts().C23) Diag(Tok, diag::ext_auto_storage_class) << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); } else diff --git a/clang/test/C/C2x/n3007.c b/clang/test/C/C2x/n3007.c index 1fd20332ceb4715..34ec419b71b271d 100644 --- a/clang/test/C/C2x/n3007.c +++ b/clang/test/C/C2x/n3007.c @@ -3,6 +3,10 @@ /* WG14 N3007: Yes * Type Inference for object definitions */ +void test_auto_int(void) { + auto int auto_int = 12; +} + void test_qualifiers(int x, const int y, int * restrict z) { const auto a = x; auto b = y; diff --git a/clang/test/Sema/c2x-auto.c b/clang/test/Sema/c2x-auto.c index 916c179adcf3182..7cbd1db31315aef 100644 --- a/clang/test/Sema/c2x-auto.c +++ b/clang/test/Sema/c2x-auto.c @@ -4,6 +4,7 @@ void test_basic_types(void) { auto undefined; // expected-error {{declaration of variable 'undefined' with deduced type 'auto' requires an initializer}} auto auto_int = 4; auto auto_long = 4UL; + auto int auto_int_ts = 12; signed auto a = 1L; // expected-error {{'auto' cannot be signed or unsigned}} _Static_assert(_Generic(auto_int, int : 1)); _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
