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111
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1 /* Test for various situations where a new declaration of an
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2 identifier conflicts with an earlier declaration which isn't in the
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3 same scope. These are all undefined behavior per C89 sections
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4 6.1.2.2p7, 6.1.2.6p2, and 6.3.2.2p2/footnote 38 (C99 6.2.2p7 and
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5 6.2.7p2 - implicit declarations are invalid in C99). */
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6
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7 /* { dg-do compile } */
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8 /* { dg-options "-std=c89 -pedantic -Wall -Wno-unused" } */
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9
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10 /* Extern at function scope, clashing with extern at file scope */
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11
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12 extern int foo1; /* { dg-message "note: previous" } */
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13 extern int bar1(int); /* { dg-message "note: previous" } */
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14
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15 void test1(void)
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16 {
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17 extern double foo1; /* { dg-error "conflict" } */
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18 extern double bar1(double); /* { dg-error "conflict" } */
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19 }
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20
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21 /* Extern at file scope, clashing with extern at function scope */
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22
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23 void test2(void)
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24 {
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25 extern double foo2; /* { dg-message "note: previous" } */
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26 extern double bar2(double); /* { dg-message "note: previous" } */
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27 }
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28
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29 extern int foo2; /* { dg-error "conflict" } */
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30 extern int bar2(int); /* { dg-error "conflict" } */
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31
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32 /* Extern at function scope, clashing with extern at earlier function
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33 scope. Also, don't be fooled by a typedef at file scope. */
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34
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35 typedef float baz3; /* { dg-bogus } */
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36
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37 void prime3(void)
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38 {
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39 extern int foo3; /* { dg-message "note: previous" } */
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40 extern int bar3(int); /* { dg-message "note: previous" } */
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41 extern int baz3; /* { dg-message "note: previous" } */
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42 }
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43
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44 void test3(void)
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45 {
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46 extern double foo3; /* { dg-error "conflict" } */
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47 extern double bar3(double); /* { dg-error "conflict" } */
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48 extern double baz3; /* { dg-error "conflict" } */
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49 }
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50
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51 /* Extern at function scope, clashing with previous implicit decl. */
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52
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53 void prime4(void)
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54 {
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55 bar4(); /* { dg-line implicit_bar4 } */
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56 /* { dg-warning "implicit declaration of function" "implicit" { target *-*-* } implicit_bar4 } */
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57 }
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58
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59 void test4(void)
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60 {
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61 extern double bar4(double); /* { dg-error "conflict" } */
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62 /* { dg-message "note: previous implicit declaration" "previous" { target *-*-* } implicit_bar4 } */
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63 }
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64
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65 /* Implicit decl, clashing with extern at previous function scope. */
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66
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67 void prime5(void)
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68 {
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69 extern double bar5(double); /* { dg-message "note: previous declaration" "previous 1" } */
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70 } /* { dg-message "note: previous implicit declaration" "previous 2" { target *-*-* } .-1 } */
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71
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72 void test5(void)
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73 {
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74 bar5(1); /* { dg-warning "implicit declaration of function" } */
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75 } /* { dg-error "incompatible implicit declaration" "" { target *-*-* } .-1 } */
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76
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77 /* Extern then static, both at file scope. */
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78
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79 extern int test6(int); /* { dg-message "note: previous" } */
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80 static int test6(int x) /* { dg-error "follows non-static" } */
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81 { return x; }
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82
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83
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84 /* Extern then static, extern at previous function scope. */
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85
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86 void prime7(void)
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87 {
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88 extern int test7(int); /* { dg-message "note: previous" } */
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89 }
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90
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91 static int test7(int x) /* { dg-error "follows non-static" } */
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92 { return x; }
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93
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94 /* Implicit decl then static. */
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95
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96 void prime8(void)
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97 {
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98 test8(); /* { dg-message "note: previous" } */
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99 /* { dg-warning "implicit" "implicit" { target *-*-* } .-1 } */
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100 }
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101
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102 static int test8(int x) /* { dg-error "follows non-static" } */
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103 { return x; }
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