[libc++] Get the GCC build mostly clean of warnings (#96604)

The GCC build has gotten to the point where it's often hard to find the
actual error in the build log. We should look into enabling these
warnings again in the future, but it looks like a lot of them are
bogous.

libcxx/include/__atomic/atomic_init.h

@@ -18,7 +18,7 @@
 #define ATOMIC_FLAG_INIT {false}
 #define ATOMIC_VAR_INIT(__v) {__v}
 
-#if _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS)
+#if _LIBCPP_STD_VER >= 20 && defined(_LIBCPP_COMPILER_CLANG_BASED) && !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS)
 #  pragma clang deprecated(ATOMIC_VAR_INIT)
 #endif
 

libcxx/src/barrier.cpp

@@ -21,17 +21,17 @@ public:
     } __tickets[64];
   };
 
-  ptrdiff_t& __expected;
-  unique_ptr<__state_t[]> __state;
+  ptrdiff_t& __expected_;
+  unique_ptr<__state_t[]> __state_;
 
-  _LIBCPP_HIDDEN __barrier_algorithm_base(ptrdiff_t& __expected) : __expected(__expected) {
+  _LIBCPP_HIDDEN __barrier_algorithm_base(ptrdiff_t& __expected) : __expected_(__expected) {
     size_t const __count = (__expected + 1) >> 1;
-    __state              = unique_ptr<__state_t[]>(new __state_t[__count]);
+    __state_             = unique_ptr<__state_t[]>(new __state_t[__count]);
   }
   _LIBCPP_HIDDEN bool __arrive(__barrier_phase_t __old_phase) {
     __barrier_phase_t const __half_step = __old_phase + 1, __full_step = __old_phase + 2;
-    size_t __current_expected = __expected,
-           __current          = hash<thread::id>()(this_thread::get_id()) % ((__expected + 1) >> 1);
+    size_t __current_expected = __expected_,
+           __current          = hash<thread::id>()(this_thread::get_id()) % ((__expected_ + 1) >> 1);
     for (int __round = 0;; ++__round) {
       if (__current_expected <= 1)
         return true;
@@ -41,14 +41,14 @@ public:
           __current = 0;
         __barrier_phase_t expect = __old_phase;
         if (__current == __last_node && (__current_expected & 1)) {
-          if (__state[__current].__tickets[__round].__phase.compare_exchange_strong(
+          if (__state_[__current].__tickets[__round].__phase.compare_exchange_strong(
                   expect, __full_step, memory_order_acq_rel))
             break; // I'm 1 in 1, go to next __round
-        } else if (__state[__current].__tickets[__round].__phase.compare_exchange_strong(
+        } else if (__state_[__current].__tickets[__round].__phase.compare_exchange_strong(
                        expect, __half_step, memory_order_acq_rel)) {
           return false; // I'm 1 in 2, done with arrival
         } else if (expect == __half_step) {
-          if (__state[__current].__tickets[__round].__phase.compare_exchange_strong(
+          if (__state_[__current].__tickets[__round].__phase.compare_exchange_strong(
                   expect, __full_step, memory_order_acq_rel))
             break; // I'm 2 in 2, go to next __round
         }

libcxx/src/filesystem/operations.cpp

@@ -934,7 +934,7 @@ path __weakly_canonical(const path& p, error_code* ec) {
   vector<string_view_t> DNEParts;
 
   error_code m_ec;
-  while (PP.State != PathParser::PS_BeforeBegin) {
+  while (PP.State_ != PathParser::PS_BeforeBegin) {
     tmp.assign(createView(p.native().data(), &PP.RawEntry.back()));
     file_status st = __status(tmp, &m_ec);
     if (!status_known(st)) {
@@ -949,7 +949,7 @@ path __weakly_canonical(const path& p, error_code* ec) {
     DNEParts.push_back(*PP);
     --PP;
   }
-  if (PP.State == PathParser::PS_BeforeBegin) {
+  if (PP.State_ == PathParser::PS_BeforeBegin) {
     result = __canonical("", &m_ec);
     if (m_ec) {
       return err.report(m_ec);

libcxx/src/filesystem/path.cpp

@@ -45,23 +45,23 @@ path& path::replace_extension(path const& replacement) {
 
 string_view_t path::__root_name() const {
   auto PP = PathParser::CreateBegin(__pn_);
-  if (PP.State == PathParser::PS_InRootName)
+  if (PP.State_ == PathParser::PS_InRootName)
     return *PP;
   return {};
 }
 
 string_view_t path::__root_directory() const {
   auto PP = PathParser::CreateBegin(__pn_);
-  if (PP.State == PathParser::PS_InRootName)
+  if (PP.State_ == PathParser::PS_InRootName)
     ++PP;
-  if (PP.State == PathParser::PS_InRootDir)
+  if (PP.State_ == PathParser::PS_InRootDir)
     return *PP;
   return {};
 }
 
 string_view_t path::__root_path_raw() const {
   auto PP = PathParser::CreateBegin(__pn_);
-  if (PP.State == PathParser::PS_InRootName) {
+  if (PP.State_ == PathParser::PS_InRootName) {
     auto NextCh = PP.peek();
     if (NextCh && isSeparator(*NextCh)) {
       ++PP;
@@ -69,24 +69,24 @@ string_view_t path::__root_path_raw() const {
     }
     return PP.RawEntry;
   }
-  if (PP.State == PathParser::PS_InRootDir)
+  if (PP.State_ == PathParser::PS_InRootDir)
     return *PP;
   return {};
 }
 
 static bool ConsumeRootName(PathParser* PP) {
   static_assert(PathParser::PS_BeforeBegin == 1 && PathParser::PS_InRootName == 2, "Values for enums are incorrect");
-  while (PP->State <= PathParser::PS_InRootName)
+  while (PP->State_ <= PathParser::PS_InRootName)
     ++(*PP);
-  return PP->State == PathParser::PS_AtEnd;
+  return PP->State_ == PathParser::PS_AtEnd;
 }
 
 static bool ConsumeRootDir(PathParser* PP) {
   static_assert(PathParser::PS_BeforeBegin == 1 && PathParser::PS_InRootName == 2 && PathParser::PS_InRootDir == 3,
                 "Values for enums are incorrect");
-  while (PP->State <= PathParser::PS_InRootDir)
+  while (PP->State_ <= PathParser::PS_InRootDir)
     ++(*PP);
-  return PP->State == PathParser::PS_AtEnd;
+  return PP->State_ == PathParser::PS_AtEnd;
 }
 
 string_view_t path::__relative_path() const {
@@ -248,7 +248,7 @@ path path::lexically_relative(const path& base) const {
     auto PP                      = PathParser::CreateBegin(__pn_);
     auto PPBase                  = PathParser::CreateBegin(base.__pn_);
     auto CheckIterMismatchAtBase = [&]() {
-      return PP.State != PPBase.State && (PP.inRootPath() || PPBase.inRootPath());
+      return PP.State_ != PPBase.State_ && (PP.inRootPath() || PPBase.inRootPath());
     };
     if (PP.inRootName() && PPBase.inRootName()) {
       if (*PP != *PPBase)
@@ -267,7 +267,7 @@ path path::lexically_relative(const path& base) const {
   // Find the first mismatching element
   auto PP     = PathParser::CreateBegin(__pn_);
   auto PPBase = PathParser::CreateBegin(base.__pn_);
-  while (PP && PPBase && PP.State == PPBase.State && *PP == *PPBase) {
+  while (PP && PPBase && PP.State_ == PPBase.State_ && *PP == *PPBase) {
     ++PP;
     ++PPBase;
   }
@@ -380,7 +380,7 @@ path::iterator path::begin() const {
   auto PP = PathParser::CreateBegin(__pn_);
   iterator it;
   it.__path_ptr_ = this;
-  it.__state_    = static_cast<path::iterator::_ParserState>(PP.State);
+  it.__state_    = static_cast<path::iterator::_ParserState>(PP.State_);
   it.__entry_    = PP.RawEntry;
   it.__stashed_elem_.__assign_view(*PP);
   return it;
@@ -396,7 +396,7 @@ path::iterator path::end() const {
 path::iterator& path::iterator::__increment() {
   PathParser PP(__path_ptr_->native(), __entry_, __state_);
   ++PP;
-  __state_ = static_cast<_ParserState>(PP.State);
+  __state_ = static_cast<_ParserState>(PP.State_);
   __entry_ = PP.RawEntry;
   __stashed_elem_.__assign_view(*PP);
   return *this;
@@ -405,7 +405,7 @@ path::iterator& path::iterator::__increment() {
 path::iterator& path::iterator::__decrement() {
   PathParser PP(__path_ptr_->native(), __entry_, __state_);
   --PP;
-  __state_ = static_cast<_ParserState>(PP.State);
+  __state_ = static_cast<_ParserState>(PP.State_);
   __entry_ = PP.RawEntry;
   __stashed_elem_.__assign_view(*PP);
   return *this;

libcxx/src/filesystem/path_parser.h

@@ -50,14 +50,14 @@ struct PathParser {
 
   const string_view_t Path;
   string_view_t RawEntry;
-  ParserState State;
+  ParserState State_;
 
 private:
-  PathParser(string_view_t P, ParserState State) noexcept : Path(P), State(State) {}
+  PathParser(string_view_t P, ParserState State) noexcept : Path(P), State_(State) {}
 
 public:
   PathParser(string_view_t P, string_view_t E, unsigned char S)
-      : Path(P), RawEntry(E), State(static_cast<ParserState>(S)) {
+      : Path(P), RawEntry(E), State_(static_cast<ParserState>(S)) {
     // S cannot be '0' or PS_BeforeBegin.
   }
 
@@ -84,7 +84,7 @@ public:
     if (Start == End)
       return makeState(PS_AtEnd);
 
-    switch (State) {
+    switch (State_) {
     case PS_BeforeBegin: {
       PosPtr TkEnd = consumeRootName(Start, End);
       if (TkEnd)
@@ -125,7 +125,7 @@ public:
     if (RStart == REnd) // we're decrementing the begin
       return makeState(PS_BeforeBegin);
 
-    switch (State) {
+    switch (State_) {
     case PS_AtEnd: {
       // Try to consume a trailing separator or root directory first.
       if (PosPtr SepEnd = consumeAllSeparators(RStart, REnd)) {
@@ -169,7 +169,7 @@ public:
   /// \brief Return a view with the "preferred representation" of the current
   ///   element. For example trailing separators are represented as a '.'
   string_view_t operator*() const noexcept {
-    switch (State) {
+    switch (State_) {
     case PS_BeforeBegin:
     case PS_AtEnd:
       return PATHSTR("");
@@ -187,7 +187,7 @@ public:
     __libcpp_unreachable();
   }
 
-  explicit operator bool() const noexcept { return State != PS_BeforeBegin && State != PS_AtEnd; }
+  explicit operator bool() const noexcept { return State_ != PS_BeforeBegin && State_ != PS_AtEnd; }
 
   PathParser& operator++() noexcept {
     increment();
@@ -199,21 +199,21 @@ public:
     return *this;
   }
 
-  bool atEnd() const noexcept { return State == PS_AtEnd; }
+  bool atEnd() const noexcept { return State_ == PS_AtEnd; }
 
-  bool inRootDir() const noexcept { return State == PS_InRootDir; }
+  bool inRootDir() const noexcept { return State_ == PS_InRootDir; }
 
-  bool inRootName() const noexcept { return State == PS_InRootName; }
+  bool inRootName() const noexcept { return State_ == PS_InRootName; }
 
   bool inRootPath() const noexcept { return inRootName() || inRootDir(); }
 
 private:
   void makeState(ParserState NewState, PosPtr Start, PosPtr End) noexcept {
-    State    = NewState;
+    State_    = NewState;
     RawEntry = string_view_t(Start, End - Start);
   }
   void makeState(ParserState NewState) noexcept {
-    State    = NewState;
+    State_    = NewState;
     RawEntry = {};
   }
 
@@ -224,7 +224,7 @@ private:
   /// \brief Return a pointer to the first character after the currently
   ///   lexed element.
   PosPtr getNextTokenStartPos() const noexcept {
-    switch (State) {
+    switch (State_) {
     case PS_BeforeBegin:
       return Path.data();
     case PS_InRootName:
@@ -241,7 +241,7 @@ private:
   /// \brief Return a pointer to the first character in the currently lexed
   ///   element.
   PosPtr getCurrentTokenStartPos() const noexcept {
-    switch (State) {
+    switch (State_) {
     case PS_BeforeBegin:
     case PS_InRootName:
       return &Path.front();

libcxx/src/locale.cpp

@@ -557,9 +557,9 @@ locale::locale(const locale& other, const locale& one, category c)
 
 string locale::name() const { return __locale_->name(); }
 
-void locale::__install_ctor(const locale& other, facet* f, long id) {
+void locale::__install_ctor(const locale& other, facet* f, long facet_id) {
   if (f)
-    __locale_ = new __imp(*other.__locale_, f, id);
+    __locale_ = new __imp(*other.__locale_, f, facet_id);
   else
     __locale_ = other.__locale_;
   __locale_->acquire();

runtimes/cmake/Modules/WarningFlags.cmake

@@ -60,6 +60,12 @@ function(cxx_add_warning_flags target enable_werror enable_pedantic)
       -Wno-c++14-compat
       -Wno-noexcept-type
       -Wno-suggest-override
+      -Wno-alloc-size-larger-than
+      -Wno-deprecated-declarations
+      -Wno-dangling-reference
+      -Wno-strict-overflow
+      -Wno-maybe-uninitialized
+      -Wno-strict-aliasing
       )
 
   endif()