switch-implicit-fallthrough-macro.cpp [plain text]
int fallthrough_compatibility_macro_from_command_line(int n) {
switch (n) {
case 0:
n = n * 10;
case 1: ;
}
return n;
}
#ifdef __clang__
#if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")
#define COMPATIBILITY_FALLTHROUGH [ [ clang \
:: fallthrough ] ] #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: ;
}
return n;
}
#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: ;
}
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: ;
}
#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: ;
#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: ;
#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: ;
#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); }