[clang] bb58748 - [clang/cxx-interop] Teach clang to ignore availability errors that come from CF_OPTIONS

[Nico Weber via cfe-commits]

Author: zoecarver
Date: 2023-08-07T09:56:25-04:00
New Revision: bb58748e52ebd48a46de20525ef2c594db044a11

URL: https://github.com/llvm/llvm-project/commit/bb58748e52ebd48a46de20525ef2c594db044a11
DIFF: https://github.com/llvm/llvm-project/commit/bb58748e52ebd48a46de20525ef2c594db044a11.diff

LOG: [clang/cxx-interop] Teach clang to ignore availability errors that come from CF_OPTIONS

This cherry-picks https://github.com/apple/llvm-project/pull/6431
since without it, macOS 14 SDK headers don't compile when targeting
catalyst.

Fixes #64438.

Added: 
    clang/test/SemaCXX/suppress-availability-error-cf-options.cpp

Modified: 
    clang/lib/Sema/SemaAvailability.cpp

Removed: 
    


################################################################################
diff  --git a/clang/lib/Sema/SemaAvailability.cpp b/clang/lib/Sema/SemaAvailability.cpp
index 05ad42780e5006..84c06566387ccb 100644
--- a/clang/lib/Sema/SemaAvailability.cpp
+++ b/clang/lib/Sema/SemaAvailability.cpp
@@ -123,6 +123,18 @@ ShouldDiagnoseAvailabilityInContext(Sema &S, AvailabilityResult K,
                                     const NamedDecl *OffendingDecl) {
   assert(K != AR_Available && "Expected an unavailable declaration here!");
 
+  // If this was defined using CF_OPTIONS, etc. then ignore the diagnostic.
+  auto DeclLoc = Ctx->getBeginLoc();
+  // This is only a problem in Foundation's C++ implementation for CF_OPTIONS.
+  if (DeclLoc.isMacroID() && S.getLangOpts().CPlusPlus &&
+      isa<TypedefDecl>(OffendingDecl)) {
+    StringRef MacroName = S.getPreprocessor().getImmediateMacroName(DeclLoc);
+    if (MacroName == "CF_OPTIONS" || MacroName == "OBJC_OPTIONS" ||
+        MacroName == "SWIFT_OPTIONS" || MacroName == "NS_OPTIONS") {
+      return false;
+    }
+  }
+
   // Checks if we should emit the availability diagnostic in the context of C.
   auto CheckContext = [&](const Decl *C) {
     if (K == AR_NotYetIntroduced) {

diff  --git a/clang/test/SemaCXX/suppress-availability-error-cf-options.cpp b/clang/test/SemaCXX/suppress-availability-error-cf-options.cpp
new file mode 100644
index 00000000000000..c28018464513f9
--- /dev/null
+++ b/clang/test/SemaCXX/suppress-availability-error-cf-options.cpp
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+// expected-no-diagnostics
+
+#define CF_OPTIONS(_type, _name) __attribute__((availability(swift, unavailable))) _type _name; enum : _name
+
+__attribute__((availability(macOS, unavailable)))
+typedef CF_OPTIONS(unsigned, TestOptions) {
+  x
+};