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jeremybenn |
/* Test for various situations where a new declaration of an
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identifier conflicts with an earlier declaration which isn't in the
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same scope. These are all undefined behavior per C89 sections
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6.1.2.2p7, 6.1.2.6p2, and 6.3.2.2p2/footnote 38 (C99 6.2.2p7 and
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6.2.7p2 - implicit declarations are invalid in C99). */
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/* { dg-do compile } */
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/* { dg-options "-std=c89 -pedantic -Wall -Wno-unused" } */
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/* Extern at function scope, clashing with extern at file scope */
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extern int foo1; /* { dg-message "note: previous" } */
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extern int bar1(int); /* { dg-message "note: previous" } */
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void test1(void)
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{
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extern double foo1; /* { dg-error "conflict" } */
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extern double bar1(double); /* { dg-error "conflict" } */
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}
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/* Extern at file scope, clashing with extern at function scope */
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void test2(void)
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{
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extern double foo2; /* { dg-message "note: previous" } */
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extern double bar2(double); /* { dg-message "note: previous" } */
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}
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extern int foo2; /* { dg-error "conflict" } */
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extern int bar2(int); /* { dg-error "conflict" } */
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/* Extern at function scope, clashing with extern at earlier function
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scope. Also, don't be fooled by a typedef at file scope. */
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typedef float baz3; /* { dg-bogus } */
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void prime3(void)
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{
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extern int foo3; /* { dg-message "note: previous" } */
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extern int bar3(int); /* { dg-message "note: previous" } */
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extern int baz3; /* { dg-message "note: previous" } */
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}
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void test3(void)
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{
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extern double foo3; /* { dg-error "conflict" } */
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extern double bar3(double); /* { dg-error "conflict" } */
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extern double baz3; /* { dg-error "conflict" } */
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}
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/* Extern at function scope, clashing with previous implicit decl. */
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void prime4(void)
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{
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bar4(); /* { dg-warning "implicit declaration of function" } */
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}
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void test4(void)
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{
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extern double bar4(double); /* { dg-error "conflict" } */
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/* { dg-message "note: previous implicit declaration" "" { target *-*-* } 55 } */
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}
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/* Implicit decl, clashing with extern at previous function scope. */
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void prime5(void)
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{
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extern double bar5(double); /* { dg-message "note: previous declaration" "" } */
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} /* { dg-message "note: previous implicit declaration" "" { target *-*-* } 68 } */
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void test5(void)
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{
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bar5(1); /* { dg-warning "implicit declaration of function" } */
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} /* { dg-error "incompatible implicit declaration" "" { target *-*-* } 73 } */
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/* Extern then static, both at file scope. */
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extern int test6(int); /* { dg-message "note: previous" "" } */
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static int test6(int x) /* { dg-error "follows non-static" } */
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{ return x; }
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/* Extern then static, extern at previous function scope. */
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void prime7(void)
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{
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extern int test7(int); /* { dg-message "note: previous" "" } */
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}
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static int test7(int x) /* { dg-error "follows non-static" } */
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{ return x; }
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/* Implicit decl then static. */
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void prime8(void)
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{
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test8(); /* { dg-message "note: previous" "" } */
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/* { dg-warning "implicit" "implicit" { target *-*-* } 97 } */
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}
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static int test8(int x) /* { dg-error "follows non-static" } */
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{ return x; }
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