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/* Test for various situations where a new declaration of an
identifier conflicts with an earlier declaration which isn't in the
same scope. These are all undefined behavior per C89 sections
6.1.2.2p7, 6.1.2.6p2, and 6.3.2.2p2/footnote 38 (C99 6.2.2p7 and
6.2.7p2 - implicit declarations are invalid in C99). */
/* { dg-do compile } */
/* { dg-options "-std=c89 -pedantic -Wall -Wno-unused" } */
/* Extern at function scope, clashing with extern at file scope */
extern int foo1; /* { dg-message "note: previous" } */
extern int bar1(int); /* { dg-message "note: previous" } */
void test1(void)
{
extern double foo1; /* { dg-error "conflict" } */
extern double bar1(double); /* { dg-error "conflict" } */
}
/* Extern at file scope, clashing with extern at function scope */
void test2(void)
{
extern double foo2; /* { dg-message "note: previous" } */
extern double bar2(double); /* { dg-message "note: previous" } */
}
extern int foo2; /* { dg-error "conflict" } */
extern int bar2(int); /* { dg-error "conflict" } */
/* Extern at function scope, clashing with extern at earlier function
scope. Also, don't be fooled by a typedef at file scope. */
typedef float baz3; /* { dg-bogus } */
void prime3(void)
{
extern int foo3; /* { dg-message "note: previous" } */
extern int bar3(int); /* { dg-message "note: previous" } */
extern int baz3; /* { dg-message "note: previous" } */
}
void test3(void)
{
extern double foo3; /* { dg-error "conflict" } */
extern double bar3(double); /* { dg-error "conflict" } */
extern double baz3; /* { dg-error "conflict" } */
}
/* Extern at function scope, clashing with previous implicit decl. */
void prime4(void)
{
bar4(); /* { dg-line implicit_bar4 } */
/* { dg-warning "implicit declaration of function" "implicit" { target *-*-* } implicit_bar4 } */
}
void test4(void)
{
extern double bar4(double); /* { dg-error "conflict" } */
/* { dg-message "note: previous implicit declaration" "previous" { target *-*-* } implicit_bar4 } */
}
/* Implicit decl, clashing with extern at previous function scope. */
void prime5(void)
{
extern double bar5(double); /* { dg-message "note: previous declaration" "previous 1" } */
} /* { dg-message "note: previous implicit declaration" "previous 2" { target *-*-* } .-1 } */
void test5(void)
{
bar5(1); /* { dg-warning "implicit declaration of function" } */
} /* { dg-error "incompatible implicit declaration" "" { target *-*-* } .-1 } */
/* Extern then static, both at file scope. */
extern int test6(int); /* { dg-message "note: previous" } */
static int test6(int x) /* { dg-error "follows non-static" } */
{ return x; }
/* Extern then static, extern at previous function scope. */
void prime7(void)
{
extern int test7(int); /* { dg-message "note: previous" } */
}
static int test7(int x) /* { dg-error "follows non-static" } */
{ return x; }
/* Implicit decl then static. */
void prime8(void)
{
test8(); /* { dg-message "note: previous" } */
/* { dg-warning "implicit" "implicit" { target *-*-* } .-1 } */
}
static int test8(int x) /* { dg-error "follows non-static" } */
{ return x; }
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