Author: Timothy Herchen Date: 2025-07-21T12:15:09-04:00 New Revision: 8366dc207a2e6b50cb8afe2d98fca68bd78bd0fa
URL: https://github.com/llvm/llvm-project/commit/8366dc207a2e6b50cb8afe2d98fca68bd78bd0fa DIFF: https://github.com/llvm/llvm-project/commit/8366dc207a2e6b50cb8afe2d98fca68bd78bd0fa.diff LOG: [clang] Don't warn on zero literals with -std=c2y (#149688) Fixes #149669; the old check compared with the end of the literal, but we can just check that after parsing digits, we're pointing to one character past the token start. Added: Modified: clang/lib/Lex/LiteralSupport.cpp clang/test/C/C2y/n3353.c Removed: ################################################################################ diff --git a/clang/lib/Lex/LiteralSupport.cpp b/clang/lib/Lex/LiteralSupport.cpp index a62508e3e27bf..5b08d7f0efe5a 100644 --- a/clang/lib/Lex/LiteralSupport.cpp +++ b/clang/lib/Lex/LiteralSupport.cpp @@ -1467,7 +1467,7 @@ void NumericLiteralParser::ParseNumberStartingWithZero(SourceLocation TokLoc) { if (s != PossibleNewDigitStart) DigitsBegin = PossibleNewDigitStart; else - IsSingleZero = (s == ThisTokEnd); // Is the only thing we've seen a 0? + IsSingleZero = (s == ThisTokBegin + 1); if (s == ThisTokEnd) return; // Done, simple octal number like 01234 diff --git a/clang/test/C/C2y/n3353.c b/clang/test/C/C2y/n3353.c index cd61cbf039067..a2e08cf6344db 100644 --- a/clang/test/C/C2y/n3353.c +++ b/clang/test/C/C2y/n3353.c @@ -44,7 +44,12 @@ static const void *ptr = 0o0; /* ext-warning {{octal integer literals are a C2y #endif // 0 by itself is not deprecated, of course. -int k = 0; +int k1 = 0; +unsigned int k2 = 0u; +long k3 = 0l; +unsigned long k4 = 0ul; +long long k5 = 0ll; +unsigned long long k6 = 0ull; // Test a preprocessor use of 0 by itself, which is also not deprecated. #if 0 @@ -65,7 +70,6 @@ static_assert(__extension__ _Generic(typeof(l), const int : 1, default : 0)); // // Note that 0o by itself is an invalid literal. int m = 0o; /* expected-error {{invalid suffix 'o' on integer constant}} - c2y-warning {{octal literals without a '0o' prefix are deprecated}} */ // Ensure negation works as expected. @@ -83,13 +87,11 @@ int n = 0o18; /* expected-error {{invalid digit '8' in octal constant}} cpp-warning {{octal integer literals are a Clang extension}} */ int o1 = 0o8; /* expected-error {{invalid suffix 'o8' on integer constant}} - c2y-warning {{octal literals without a '0o' prefix are deprecated}} */ // FIXME: however, it matches the behavior for hex literals in terms of the // error reported. Unfortunately, we then go on to think 0 is an octal literal // without a prefix, which is again a bit confusing. int o2 = 0xG; /* expected-error {{invalid suffix 'xG' on integer constant}} - c2y-warning {{octal literals without a '0o' prefix are deprecated}} */ // Show that floating-point suffixes on octal literals are rejected. @@ -130,7 +132,6 @@ constexpr int p = 0o0'1'2'3'4'5'6'7; /* compat-warning {{octal integer literals */ static_assert(p == 01234567); // c2y-warning {{octal literals without a '0o' prefix are deprecated}} int q = 0o'0'1; /* expected-error {{invalid suffix 'o'0'1' on integer constant}} - c2y-warning {{octal literals without a '0o' prefix are deprecated}} */ #define M 0o123 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
