Support __attribute__((availability)) on Android.

[srhines]

Looks great. This should be really nice for validating native API usage.

cfe/trunk/include/clang/Basic/Attr.td

 def Availability : InheritableAttr {
   let Spellings = [GNU<"availability">];
   let Args = [IdentifierArgument<"platform">, VersionArgument<"introduced">,
               VersionArgument<"deprecated">, VersionArgument<"obsoleted">,
               BoolArgument<"unavailable">, StringArgument<"message">];
   let AdditionalMembers =
 [{static llvm::StringRef getPrettyPlatformName(llvm::StringRef Platform) {
     return llvm::StringSwitch<llvm::StringRef>(Platform)
+             .Case("android", "Android")
              .Case("ios", "iOS")
              .Case("macosx", "OS X")
              .Case("ios_app_extension", "iOS (App Extension)")
              .Case("macosx_app_extension", "OS X (App Extension)")
              .Default(llvm::StringRef());
 } }];
   let HasCustomParsing = 1;
   let DuplicatesAllowedWhileMerging = 1;

cfe/trunk/lib/Basic/Targets.cpp

 protected:
   void getOSDefines(const LangOptions &Opts, const llvm::Triple &Triple,
                     MacroBuilder &Builder) const override {
     // Linux defines; list based off of gcc output
     DefineStd(Builder, "unix", Opts);
     DefineStd(Builder, "linux", Opts);
     Builder.defineMacro("__gnu_linux__");
     Builder.defineMacro("__ELF__");
-    if (Triple.getEnvironment() == llvm::Triple::Android)
+    if (Triple.getEnvironment() == llvm::Triple::Android) {
       Builder.defineMacro("__ANDROID__", "1");
+      unsigned Maj, Min, Rev;
+      Triple.getOSVersion(Maj, Min, Rev);
+      this->PlatformName = "android";
+      this->PlatformMinVersion = VersionTuple(Maj, Min, Rev);
+    }
     if (Opts.POSIXThreads)
       Builder.defineMacro("_REENTRANT");
     if (Opts.CPlusPlus)
       Builder.defineMacro("_GNU_SOURCE");
   }
 public:
   LinuxTargetInfo(const llvm::Triple &Triple) : OSTargetInfo<Target>(Triple) {
     this->UserLabelPrefix = "";

cfe/trunk/test/Sema/attr-availability-android.c

+// RUN: %clang_cc1 "-triple" "arm-linux-androideabi16" -fsyntax-only -verify %s
+
+void f0(int) __attribute__((availability(android,introduced=14,deprecated=19)));
+void f1(int) __attribute__((availability(android,introduced=16)));
+void f2(int) __attribute__((availability(android,introduced=14,deprecated=16))); // expected-note {{'f2' has been explicitly marked deprecated here}}
+void f3(int) __attribute__((availability(android,introduced=19)));
+void f4(int) __attribute__((availability(android,introduced=9,deprecated=11,obsoleted=16), availability(ios,introduced=2.0,deprecated=3.0))); // expected-note{{explicitly marked unavailable}}
+void f5(int) __attribute__((availability(ios,introduced=3.2), availability(android,unavailable))); // expected-note{{'f5' has been explicitly marked unavailable here}}
+
+void test() {
+  f0(0);
+  f1(0);
+  f2(0); // expected-warning{{'f2' is deprecated: first deprecated in Android 16}}
+  f3(0);
+  f4(0); // expected-error{{f4' is unavailable: obsoleted in Android 16}}
+  f5(0); // expected-error{{'f5' is unavailable: not available on Android}}
+}
+
+// rdar://10535640
+
+enum {
+    foo __attribute__((availability(android,introduced=8.0,deprecated=9.0)))
+};
+
+enum {
+    bar __attribute__((availability(android,introduced=8.0,deprecated=9.0))) = foo
+};
+
+enum __attribute__((availability(android,introduced=8.0,deprecated=9.0))) {
+    bar1 = foo
+};