Parse/Sema: Add support for '#pragma options align=native'.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@104864 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Parse/Action.h

@@ -2565,6 +2565,7 @@ public:
   //===---------------------------- Pragmas -------------------------------===//
 
   enum PragmaOptionsAlignKind {
+    POAK_Native,  // #pragma options align=native
     POAK_Natural, // #pragma options align=natural
     POAK_Power,   // #pragma options align=power
     POAK_Mac68k,  // #pragma options align=mac68k

lib/Parse/ParsePragma.cpp

@@ -110,7 +110,7 @@ void PragmaPackHandler::HandlePragma(Preprocessor &PP, Token &PackTok) {
                           LParenLoc, RParenLoc);
 }
 
-// #pragma 'options' 'align' '=' {'natural', 'mac68k', 'power', 'reset'}
+// #pragma 'options' 'align' '=' {'native','natural','mac68k','power','reset'}
 void PragmaOptionsHandler::HandlePragma(Preprocessor &PP, Token &OptionsTok) {
   SourceLocation OptionsLoc = OptionsTok.getLocation();
 
@@ -120,7 +120,7 @@ void PragmaOptionsHandler::HandlePragma(Preprocessor &PP, Token &OptionsTok) {
     PP.Diag(Tok.getLocation(), diag::warn_pragma_options_expected_align);
     return;
   }
-  
+
   PP.Lex(Tok);
   if (Tok.isNot(tok::equal)) {
     PP.Diag(Tok.getLocation(), diag::warn_pragma_options_expected_equal);
@@ -136,7 +136,9 @@ void PragmaOptionsHandler::HandlePragma(Preprocessor &PP, Token &OptionsTok) {
 
   Action::PragmaOptionsAlignKind Kind = Action::POAK_Natural;
   const IdentifierInfo *II = Tok.getIdentifierInfo();
-  if (II->isStr("natural"))
+  if (II->isStr("native"))
+    Kind = Action::POAK_Native;
+  else if (II->isStr("natural"))
     Kind = Action::POAK_Natural;
   else if (II->isStr("power"))
     Kind = Action::POAK_Power;

lib/Sema/SemaAttr.cpp

@@ -137,6 +137,10 @@ void Sema::ActOnPragmaOptionsAlign(PragmaOptionsAlignKind Kind,
 
   // We don't support #pragma options align=power.
   switch (Kind) {
+    // For all targets we support native and natural are the same.
+    //
+    // FIXME: This is not true on Darwin/PPC.
+  case POAK_Native:
   case POAK_Natural:
     Context->push(0);
     Context->setAlignment(0);

test/Sema/pragma-pack-and-options-align.c

@@ -16,6 +16,14 @@ struct s1 {
 };
 extern int a[sizeof(struct s1) == 8 ? 1 : -1];
 
+#pragma options align=reset
+#pragma options align=native
+struct s1_1 {
+  char c;
+  int x;
+};
+extern int a[sizeof(struct s1_1) == 8 ? 1 : -1];
+
 #pragma pack(pop)
 struct s2 {
   char c;