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comparison gcc/testsuite/g++.dg/init/string4.C @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
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111:04ced10e8804 131:84e7813d76e9
1 // PR tree-optimization/71625 - missing strlen optimization on different
2 // array initialization style
3
4 // Verify that zero-length array initialization results in the expected
5 // array sizes and in the expected diagnostics. See init-string-3.c
6 // for the corresponding C test.
7
8 // { dg-do compile }
9 // { dg-options "-Wall -Wno-unused-local-typedefs -fpermissive" }
10
11 #define A(expr) typedef char A[-1 + 2 * !!(expr)];
12
13 const char a[] = { };
14
15 A (sizeof a == 0);
16
17
18 const char b[0] = { };
19
20 A (sizeof b == 0);
21
22 // Also verify that the error is "too many initializers for
23 // 'const char [0]'" and not "initializer-string is too long."
24 const char c[0] = { 1 }; // { dg-error "too many initializers for .const char \\\[0]" }
25
26 A (sizeof c == 0);
27
28
29 void test_auto_empty (void)
30 {
31 const char a[] = { };
32
33 A (sizeof a == 0);
34 }
35
36 void test_auto_zero_length (void)
37 {
38 const char a[0] = { };
39
40 A (sizeof a == 0);
41
42 const char b[0] = { 0 }; // { dg-error "too many initializers" }
43
44 A (sizeof b == 0);
45
46 const char c[0] = ""; // { dg-warning "too long" }
47
48 A (sizeof c == 0);
49 }
50
51
52 void test_compound_zero_length (void)
53 {
54 A (sizeof (const char[]){ } == 0);
55 A (sizeof (const char[0]){ } == 0);
56 A (sizeof (const char[0]){ 0 } == 0); // { dg-error "too many" }
57 A (sizeof (const char[0]){ 1 } == 0); // { dg-error "too many" }
58 A (sizeof (const char[0]){ "" } == 0); // { dg-warning "too long" }
59 A (sizeof (const char[0]){ "1" } == 0); // { dg-warning "too long" }
60 }