[libc++][NFC] Inline _LIBCPP_FALLTHROUGH() (#135001)
We have `[[fallthrough]]` available in all standards modes, so we can
just inline it like other stanard attributes we use.
diff --git a/libcxx/include/__config b/libcxx/include/__config
index 3f03ceb..e14632f 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -1124,9 +1124,6 @@
__attribute__((__format__(archetype, format_string_index, first_format_arg_index)))
# define _LIBCPP_PACKED __attribute__((__packed__))
-// Use a function like macro to imply that it must be followed by a semicolon
-# define _LIBCPP_FALLTHROUGH() [[fallthrough]]
-
# if __has_attribute(__no_sanitize__) && !defined(_LIBCPP_COMPILER_GCC)
# define _LIBCPP_NO_CFI __attribute__((__no_sanitize__("cfi")))
# else
diff --git a/libcxx/include/__functional/hash.h b/libcxx/include/__functional/hash.h
index 5b7c88e..3b50ecc 100644
--- a/libcxx/include/__functional/hash.h
+++ b/libcxx/include/__functional/hash.h
@@ -64,10 +64,10 @@
switch (__len) {
case 3:
__h ^= static_cast<_Size>(__data[2] << 16);
- _LIBCPP_FALLTHROUGH();
+ [[__fallthrough__]];
case 2:
__h ^= static_cast<_Size>(__data[1] << 8);
- _LIBCPP_FALLTHROUGH();
+ [[__fallthrough__]];
case 1:
__h ^= __data[0];
__h *= __m;
diff --git a/libcxx/include/locale b/libcxx/include/locale
index 8e07b8b..d7b8144 100644
--- a/libcxx/include/locale
+++ b/libcxx/include/locale
@@ -2419,7 +2419,7 @@
return false;
}
}
- _LIBCPP_FALLTHROUGH();
+ [[__fallthrough__]];
case money_base::none:
if (__p != 3) {
while (__b != __e && __ct.is(ctype_base::space, *__b))
diff --git a/libcxx/include/regex b/libcxx/include/regex
index ea5302c..12fc0787 100644
--- a/libcxx/include/regex
+++ b/libcxx/include/regex
@@ -3929,7 +3929,7 @@
if (__hd == -1)
std::__throw_regex_error<regex_constants::error_escape>();
__sum = 16 * __sum + static_cast<unsigned>(__hd);
- _LIBCPP_FALLTHROUGH();
+ [[__fallthrough__]];
case 'x':
++__first;
if (__first == __last)
diff --git a/libcxx/src/filesystem/path_parser.h b/libcxx/src/filesystem/path_parser.h
index 0662369..5968f44 100644
--- a/libcxx/src/filesystem/path_parser.h
+++ b/libcxx/src/filesystem/path_parser.h
@@ -90,7 +90,7 @@
if (TkEnd)
return makeState(PS_InRootName, Start, TkEnd);
}
- _LIBCPP_FALLTHROUGH();
+ [[__fallthrough__]];
case PS_InRootName: {
PosPtr TkEnd = consumeAllSeparators(Start, End);
if (TkEnd)
