extern-redecl.c
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// RUN: %clang_cc1 -fsyntax-only -verify %s
// rdar: // 8125274
static int a16[]; // expected-warning {{tentative array definition assumed to have one element}}
void f16(void) {
extern int a16[];
}
// PR10013: Scope of extern declarations extend past enclosing block
extern int PR10013_x;
int PR10013(void) {
int *PR10013_x = 0;
{
extern int PR10013_x;
extern int PR10013_x;
}
return PR10013_x; // expected-warning{{incompatible pointer to integer conversion}}
}
static int test1_a[]; // expected-warning {{tentative array definition assumed to have one element}}
extern int test1_a[];
// rdar://13535367
void test2declarer() { extern int test2_array[100]; }
extern int test2_array[];
int test2v = sizeof(test2_array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
void test3declarer() {
{ extern int test3_array[100]; }
extern int test3_array[];
int x = sizeof(test3_array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
}
void test4() {
extern int test4_array[];
{
extern int test4_array[100];
int x = sizeof(test4_array); // fine
}
int x = sizeof(test4_array); // expected-error {{invalid application of 'sizeof' to an incomplete type 'int []'}}
}
// Test that invalid local extern declarations of library
// builtins behave reasonably.
extern void abort(void); // expected-note 2 {{previous declaration is here}}
extern float *calloc(); // expected-warning {{incompatible redeclaration of library function}} expected-note {{is a builtin}} expected-note 2 {{previous declaration is here}}
void test5a() {
int abort(); // expected-error {{conflicting types}}
float *malloc(); // expected-warning {{incompatible redeclaration of library function}} expected-note 2 {{is a builtin}}
int *calloc(); // expected-error {{conflicting types}}
}
void test5b() {
int abort(); // expected-error {{conflicting types}}
float *malloc(); // expected-warning {{incompatible redeclaration of library function}}
int *calloc(); // expected-error {{conflicting types}}
}
void test5c() {
void (*_abort)(void) = &abort;
void *(*_malloc)() = &malloc;
float *(*_calloc)() = &calloc;
}
void test6() {
extern int test6_array1[100];
extern int test6_array2[100];
void test6_fn1(int*);
void test6_fn2(int*);
{
// Types are only merged from visible declarations.
char test6_array2;
char test6_fn2;
{
extern int test6_array1[];
extern int test6_array2[];
(void)sizeof(test6_array1); // ok
(void)sizeof(test6_array2); // expected-error {{incomplete type}}
void test6_fn1();
void test6_fn2();
test6_fn1(1.2); // expected-error {{passing 'double' to parameter of incompatible type 'int *'}}
// FIXME: This is valid, but we should warn on it.
test6_fn2(1.2);
}
}
}