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// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -Wimplicit-fallthrough -DCOMMAND_LINE_FALLTHROUGH=[[clang::fallthrough]] %s
int fallthrough_compatibility_macro_from_command_line(int n) {
switch (n) {
case 0:
n = n * 10;
case 1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'COMMAND_LINE_FALLTHROUGH;' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}}
;
}
return n;
}
#ifdef __clang__
#if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")
#define COMPATIBILITY_FALLTHROUGH [ [ /* test */ clang /* test */ \
:: fallthrough ] ] // testing whitespace and comments in macro definition
#endif
#endif
#ifndef COMPATIBILITY_FALLTHROUGH
#define COMPATIBILITY_FALLTHROUGH do { } while (0)
#endif
int fallthrough_compatibility_macro_from_source(int n) {
switch (n) {
case 0:
n = n * 20;
case 1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'COMPATIBILITY_FALLTHROUGH;' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}}
;
}
return n;
}
// Deeper macro substitution
#define M1 [[clang::fallthrough]]
#ifdef __clang__
#define M2 M1
#else
#define M2
#endif
#define WRONG_MACRO1 clang::fallthrough
#define WRONG_MACRO2 [[clang::fallthrough]
#define WRONG_MACRO3 [[clang::fall through]]
#define WRONG_MACRO4 [[clang::fallthrough]]]
int fallthrough_compatibility_macro_in_macro(int n) {
switch (n) {
case 0:
n = n * 20;
case 1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'M1;' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}}
// there was an idea that this ^ should be M2
;
}
return n;
}
#undef M1
#undef M2
#undef COMPATIBILITY_FALLTHROUGH
#undef COMMAND_LINE_FALLTHROUGH
int fallthrough_compatibility_macro_undefined(int n) {
switch (n) {
case 0:
n = n * 20;
case 1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert '[[clang::fallthrough]];' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}}
;
}
#define TOO_LATE [[clang::fallthrough]]
return n;
}
#undef TOO_LATE
#define MACRO_WITH_HISTORY 11111111
#undef MACRO_WITH_HISTORY
#define MACRO_WITH_HISTORY [[clang::fallthrough]]
#undef MACRO_WITH_HISTORY
#define MACRO_WITH_HISTORY 2222222
int fallthrough_compatibility_macro_history(int n) {
switch (n) {
case 0:
n = n * 20;
#undef MACRO_WITH_HISTORY
case 1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert '[[clang::fallthrough]];' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}}
;
#define MACRO_WITH_HISTORY [[clang::fallthrough]]
}
return n;
}
#undef MACRO_WITH_HISTORY
#define MACRO_WITH_HISTORY 11111111
#undef MACRO_WITH_HISTORY
#define MACRO_WITH_HISTORY [[clang::fallthrough]]
#undef MACRO_WITH_HISTORY
#define MACRO_WITH_HISTORY 2222222
#undef MACRO_WITH_HISTORY
int fallthrough_compatibility_macro_history2(int n) {
switch (n) {
case 0:
n = n * 20;
#define MACRO_WITH_HISTORY [[clang::fallthrough]]
case 1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'MACRO_WITH_HISTORY;' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}}
;
#undef MACRO_WITH_HISTORY
#define MACRO_WITH_HISTORY 3333333
#undef MACRO_WITH_HISTORY
#define MACRO_WITH_HISTORY 4444444
#undef MACRO_WITH_HISTORY
#define MACRO_WITH_HISTORY 5555555
}
return n;
}
template<const int N>
int fallthrough_compatibility_macro_history_template(int n) {
switch (N * n) {
case 0:
n = n * 20;
#define MACRO_WITH_HISTORY2 [[clang::fallthrough]]
case 1: // expected-warning{{unannotated fall-through between switch labels}} expected-note{{insert 'MACRO_WITH_HISTORY2;' to silence this warning}} expected-note{{insert 'break;' to avoid fall-through}}
;
#undef MACRO_WITH_HISTORY2
#define MACRO_WITH_HISTORY2 3333333
}
return n;
}
#undef MACRO_WITH_HISTORY2
#define MACRO_WITH_HISTORY2 4444444
#undef MACRO_WITH_HISTORY2
#define MACRO_WITH_HISTORY2 5555555
void f() {
fallthrough_compatibility_macro_history_template<1>(0); // expected-note{{in instantiation of function template specialization 'fallthrough_compatibility_macro_history_template<1>' requested here}}
}
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