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// { dg-do compile }
// Copyright 2005 Free Software Foundation
// by Alexandre Oliva <aoliva@redhat.com>
// based on https://bugzilla.redhat.com/beta/show_bug.cgi?id=149098
// Per the ISO C++ 90 Standard, using declarations before of after a
// declaration of the same function name and prototype should be
// errors (7.3.3/11). However, DR 101's resolution recommends
// accepting such duplicates if they denote the same function, which
// means extern "C" declarations are supposed to match and be
// accepted.
// This test makes sure we reject or accept regular and using
// declarations regardless of order as appropriate, and that having
// built-in declarations or overloads doesn't affet the outcome.
namespace std {
extern "C" void exit (int) throw (); // these are built-in (extern "C")
extern "C" void *malloc (__SIZE_TYPE__) throw () __attribute__((malloc));
void abort (void) throw (); // these aren't
void _exit (int) throw (); // { dg-message "std::_exit" }
extern "C" void c1 (void) throw ();
void C1 (void) throw (); // { dg-message "std::C1" }
extern "C" void c2 (void) throw ();
void C2 (void) throw ();
extern "C" void c3 (void) throw ();
void C3 (void) throw (); // { dg-message "std::C3" }
}
namespace other {
extern "C" void c3 (void) throw ();
void C3 (void) throw (); // { dg-message "other::C3" }
}
using std::exit;
using std::_exit;
using std::c1;
using std::C1;
extern "C" void exit (int) throw ();
extern "C" void *malloc (__SIZE_TYPE__) throw () __attribute__((malloc));
void abort (void) throw ();
void _exit (int) throw (); // { dg-error "conflicts" "conflicts" }
// { dg-message "void _exit" "_exit" { target *-*-* } 49 }
extern "C" void c1 (void) throw ();
void C1 (void) throw (); // { dg-error "conflicts" "conflicts" }
// { dg-message "void C1" "C1" { target *-*-* } 53 }
extern "C" void c2 (void) throw ();
void C2 (void) throw ();
int C3 (int) throw ();
using std::malloc;
using std::abort; // { dg-error "already declared" }
using std::c2;
using std::C2; // { dg-error "already declared" }
using std::c3; using other::c3;
using std::C3; using other::C3;
long C3 (long) throw ();
int main () {
malloc (0);
exit (0);
_exit (0); // { dg-error "ambiguous" }
// { dg-message "candidate" "candidate note" { target *-*-* } 75 }
abort ();
c1 ();
C1 (); // { dg-error "ambiguous" }
// { dg-message "candidate" "candidate note" { target *-*-* } 80 }
c2 ();
C2 (); // one might expect an ambiguous call error here as well, but
// we don't add the using decl if we find it to be in error.
c3 ();
C3 (); // { dg-error "ambiguous" }
// { dg-message "candidate" "candidate note" { target *-*-* } 88 }
C3 (0);
C3 (0l);
}
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