[ObjC] Avoid the -Wunguarded-availability warnings for protocol

requirements in protocol/class/category declarations

The unguarded availability warnings in the protocol requirements of a protocol
/class/category declaration can be avoided. This matches the behaviour of
Swift's diagnostics. The warnings for deprecated/unavailable protocols are
preserved.

rdar://33156429

Differential Revision: https://reviews.llvm.org/D35061

llvm-svn: 307368

2 files changed, 12 insertions, 4 deletions

diff --git a/clang/lib/Sema/SemaDeclObjC.cpp b/clang/lib/Sema/SemaDeclObjC.cpp
index 2c8080dbf02..778b8062f68 100644
--- a/clang/lib/Sema/SemaDeclObjC.cpp
+++ b/clang/lib/Sema/SemaDeclObjC.cpp
@@ -458,7 +458,10 @@ static void diagnoseUseOfProtocols(Sema &TheSema,
   // Diagnose availability in the context of the ObjC container.
   Sema::ContextRAII SavedContext(TheSema, CD);
   for (unsigned i = 0; i < NumProtoRefs; ++i) {
-    (void)TheSema.DiagnoseUseOfDecl(ProtoRefs[i], ProtoLocs[i]);
+    (void)TheSema.DiagnoseUseOfDecl(ProtoRefs[i], ProtoLocs[i],
+                                    /*UnknownObjCClass=*/nullptr,
+                                    /*ObjCPropertyAccess=*/false,
+                                    /*AvoidPartialAvailabilityChecks=*/true);
   }
 }
 
diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 5a22322aa03..80df07630e1 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -128,7 +128,8 @@ Sema::ShouldDiagnoseAvailabilityOfDecl(const NamedDecl *D,
 static void
 DiagnoseAvailabilityOfDecl(Sema &S, NamedDecl *D, SourceLocation Loc,
                            const ObjCInterfaceDecl *UnknownObjCClass,
-                           bool ObjCPropertyAccess) {
+                           bool ObjCPropertyAccess,
+                           bool AvoidPartialAvailabilityChecks = false) {
   std::string Message;
   AvailabilityResult Result;
   const NamedDecl* OffendingDecl;
@@ -138,6 +139,8 @@ DiagnoseAvailabilityOfDecl(Sema &S, NamedDecl *D, SourceLocation Loc,
     return;
 
   if (Result == AR_NotYetIntroduced) {
+    if (AvoidPartialAvailabilityChecks)
+      return;
     if (S.getCurFunctionOrMethodDecl()) {
       S.getEnclosingFunction()->HasPotentialAvailabilityViolations = true;
       return;
@@ -275,7 +278,8 @@ void Sema::MaybeSuggestAddingStaticToDecl(const FunctionDecl *Cur) {
 ///
 bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc,
                              const ObjCInterfaceDecl *UnknownObjCClass,
-                             bool ObjCPropertyAccess) {
+                             bool ObjCPropertyAccess,
+                             bool AvoidPartialAvailabilityChecks) {
   if (getLangOpts().CPlusPlus && isa<FunctionDecl>(D)) {
     // If there were any diagnostics suppressed by template argument deduction,
     // emit them now.
@@ -360,7 +364,8 @@ bool Sema::DiagnoseUseOfDecl(NamedDecl *D, SourceLocation Loc,
   }
 
   DiagnoseAvailabilityOfDecl(*this, D, Loc, UnknownObjCClass,
-                             ObjCPropertyAccess);
+                             ObjCPropertyAccess,
+                             AvoidPartialAvailabilityChecks);
 
   DiagnoseUnusedOfDecl(*this, D, Loc);