| // RUN: %clang_cc1 -triple x86_64-linux -Wunused -x c -verify %s |
| // RUN: %clang_cc1 -triple x86_64-linux -Wunused -verify=expected,cxx %s |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| static int f(void) { return 42; } |
| int g(void) __attribute__((alias("f"))); |
| |
| static int foo [] = { 42, 0xDEAD }; // cxx-warning{{variable 'foo' is not needed and will not be emitted}} |
| extern typeof(foo) bar __attribute__((unused, alias("foo"))); |
| |
| /// https://github.com/llvm/llvm-project/issues/88593 |
| /// We report a warning in C++ mode because the internal linkage `resolver` gets |
| /// mangled as it does not have a language linkage. GCC does not mangle |
| /// `resolver` or report a warning. |
| static int (*resolver(void))(void) { return f; } // cxx-warning{{unused function 'resolver'}} |
| int ifunc(void) __attribute__((ifunc("resolver"))); |
| |
| static int __attribute__((overloadable)) f0(int x) { return x; } |
| static float __attribute__((overloadable)) f0(float x) { return x; } // expected-warning{{unused function 'f0'}} |
| int g0(void) __attribute__((alias("_ZL2f0i"))); |
| |
| #ifdef __cplusplus |
| static int f1() { return 42; } |
| int g1(void) __attribute__((alias("_ZL2f1v"))); |
| } |
| |
| /// We demangle alias/ifunc target and mark all found functions as used. |
| |
| static int f2(int) { return 42; } // cxx-warning{{unused function 'f2'}} |
| static int f2() { return 42; } |
| int g2() __attribute__((alias("_ZL2f2v"))); |
| |
| static int (*resolver1())() { return f; } // cxx-warning{{unused function 'resolver1'}} |
| static int (*resolver1(int))() { return f; } |
| int ifunc1() __attribute__((ifunc("_ZL9resolver1i"))); |
| |
| /// TODO: We should report "unused function" for f3(int). |
| namespace ns { |
| static int f3(int) { return 42; } // cxx-warning{{unused function 'f3'}} |
| static int f3() { return 42; } // cxx-warning{{unused function 'f3'}} |
| int g3() __attribute__((alias("_ZN2nsL2f3Ev"))); |
| } |
| |
| template <class T> |
| static void *f4(T) { return nullptr; } |
| static void *f4() { return nullptr; } // cxx-warning{{unused function 'f4'}} |
| extern void g4_int() __attribute__((ifunc("_ZL2f4IiEPvT_"))); |
| extern void g4_char() __attribute__((ifunc("_ZL2f4IcEPcT_"))); // rejected by CodeGen |
| void *use4 = f4(0); |
| #endif |