1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
// RUN: %clang_cc1 -verify=expected,c2y,c -pedantic -std=c2y %s
// RUN: %clang_cc1 -verify=expected,c2y,compat -Wpre-c2y-compat -std=c2y %s
// RUN: %clang_cc1 -verify=expected,ext,c -pedantic -std=c23 %s
// RUN: %clang_cc1 -verify=expected,cpp -pedantic -x c++ -Wno-c11-extensions %s
/* WG14 N3353: Clang 21
* Obsolete implicitly octal literals and add delimited escape sequences
*/
constexpr int i = 0234; // c2y-warning {{octal literals without a '0o' prefix are deprecated}}
constexpr int j = 0o234; /* ext-warning {{octal integer literals are a C2y extension}}
cpp-warning {{octal integer literals are a Clang extension}}
compat-warning {{octal integer literals are incompatible with standards before C2y}}
*/
static_assert(i == 156);
static_assert(j == 156);
// Show that 0O is the same as Oo (tested above)
static_assert(0O1234 == 0o1234); /* ext-warning 2 {{octal integer literals are a C2y extension}}
cpp-warning 2 {{octal integer literals are a Clang extension}}
compat-warning 2 {{octal integer literals are incompatible with standards before C2y}}
*/
// Show that you can use them with the usual integer literal suffixes.
static_assert(0o234ull == 156); /* ext-warning {{octal integer literals are a C2y extension}}
cpp-warning {{octal integer literals are a Clang extension}}
compat-warning {{octal integer literals are incompatible with standards before C2y}}
*/
// And it's still a valid null pointer constant.
static const void *ptr = 0o0; /* ext-warning {{octal integer literals are a C2y extension}}
cpp-warning {{octal integer literals are a Clang extension}}
compat-warning {{octal integer literals are incompatible with standards before C2y}}
*/
// Demonstrate that it works fine in the preprocessor.
#if 0o123 != 0x53 /* ext-warning {{octal integer literals are a C2y extension}}
cpp-warning {{octal integer literals are a Clang extension}}
compat-warning {{octal integer literals are incompatible with standards before C2y}}
*/
#error "oh no, math stopped working!"
#endif
// 0 by itself is not deprecated, of course.
int k = 0;
// Test a preprocessor use of 0 by itself, which is also not deprecated.
#if 0
#endif
// Make sure there are no surprises with auto and type deduction. Promotion
// turns this into an 'int', and 'constexpr' implies 'const'.
constexpr auto l = 0o1234567; /* ext-warning {{octal integer literals are a C2y extension}}
cpp-warning {{octal integer literals are a Clang extension}}
compat-warning {{octal integer literals are incompatible with standards before C2y}}
*/
static_assert(l == 0x53977);
static_assert(__extension__ _Generic(typeof(0o1), typeof(01) : 1, default : 0)); /* c2y-warning {{octal literals without a '0o' prefix are deprecated}}
compat-warning {{passing a type argument as the first operand to '_Generic' is incompatible with C standards before C2y}}
compat-warning {{octal integer literals are incompatible with standards before C2y}}
*/
static_assert(__extension__ _Generic(typeof(l), const int : 1, default : 0)); // compat-warning {{passing a type argument as the first operand to '_Generic' is incompatible with C standards before C2y}}
// 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.
static_assert(-0o1234 == -668); /* ext-warning {{octal integer literals are a C2y extension}}
cpp-warning {{octal integer literals are a Clang extension}}
compat-warning {{octal integer literals are incompatible with standards before C2y}}
*/
// FIXME: it would be better to not diagnose the compat and ext warnings when
// the octal literal is invalid.
// We expect diagnostics for non-octal digits.
int n = 0o18; /* expected-error {{invalid digit '8' in octal constant}}
compat-warning {{octal integer literals are incompatible with standards before C2y}}
ext-warning {{octal integer literals are a C2y extension}}
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.
auto f1 = 0o0.; /* expected-error {{invalid suffix '.' on integer constant}}
compat-warning {{octal integer literals are incompatible with standards before C2y}}
ext-warning {{octal integer literals are a C2y extension}}
cpp-warning {{octal integer literals are a Clang extension}}
*/
auto f2 = 0o0.1; /* expected-error {{invalid suffix '.1' on integer constant}}
compat-warning {{octal integer literals are incompatible with standards before C2y}}
ext-warning {{octal integer literals are a C2y extension}}
cpp-warning {{octal integer literals are a Clang extension}}
*/
auto f3 = 0o0e1; /* expected-error {{invalid suffix 'e1' on integer constant}}
compat-warning {{octal integer literals are incompatible with standards before C2y}}
ext-warning {{octal integer literals are a C2y extension}}
cpp-warning {{octal integer literals are a Clang extension}}
*/
auto f4 = 0o0E1; /* expected-error {{invalid suffix 'E1' on integer constant}}
compat-warning {{octal integer literals are incompatible with standards before C2y}}
ext-warning {{octal integer literals are a C2y extension}}
cpp-warning {{octal integer literals are a Clang extension}}
*/
// Show that valid floating-point literals with a leading 0 do not produce octal-related warnings.
auto f5 = 0.;
auto f7 = 00.;
auto f8 = 01.;
auto f9 = 0e1;
auto f10 = 0E1;
auto f11 = 00e1;
auto f12 = 00E1;
// Ensure digit separators work as expected.
constexpr int p = 0o0'1'2'3'4'5'6'7; /* compat-warning {{octal integer literals are incompatible with standards before C2y}}
ext-warning {{octal integer literals are a C2y extension}}
cpp-warning {{octal integer literals are a Clang extension}}
*/
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
int r = M; /* compat-warning {{octal integer literals are incompatible with standards before C2y}}
ext-warning {{octal integer literals are a C2y extension}}
cpp-warning {{octal integer literals are a Clang extension}}
*/
// Also, test delimited escape sequences. Note, this paper added a delimited
// escape sequence for octal *and* hex.
auto a = "\x{12}\o{12}\N{SPARKLES}"; /* compat-warning 2 {{delimited escape sequences are incompatible with C standards before C2y}}
ext-warning 2 {{delimited escape sequences are a C2y extension}}
cpp-warning 2 {{delimited escape sequences are a C++23 extension}}
cpp-warning {{named escape sequences are a C++23 extension}}
c-warning {{named escape sequences are a Clang extension}}
*/
#ifdef __cplusplus
template <unsigned N>
struct S {
static_assert(N == 0o567); /* ext-warning {{octal integer literals are a C2y extension}}
cpp-warning {{octal integer literals are a Clang extension}}
compat-warning {{octal integer literals are incompatible with standards before C2y}}
*/
};
void foo() {
S<0o567> s; /* ext-warning {{octal integer literals are a C2y extension}}
cpp-warning {{octal integer literals are a Clang extension}}
compat-warning {{octal integer literals are incompatible with standards before C2y}}
*/
}
#endif
#line 0123 // expected-warning {{#line directive interprets number as decimal, not octal}}
#line 0o123 // expected-error {{#line directive requires a simple digit sequence}}
|
