Objective-C: Serialize "more than one decl" state of ObjCMethodList.

This fixes PR21587, what r221933 fixed for regular programs is now also
fixed for decls coming from PCH files.

Use another bit from the count/bits uint16_t for storing the "more than one
decl" bit.  This reduces the number of bits for the count from 14 to 13.
The selector with the most overloads in Cocoa.h has ~55 overloads, so 13 bits
should still be plenty.  Since this changes the meaning of a serialized bit
pattern, also increase clang::serialization::VERSION_MAJOR.

Storing the "more than one decl" state of only the first overload isn't quite
correct, but Sema::AreMultipleMethodsInGlobalPool() currently only looks at
the state of the first overload so it's good enough for now.

llvm-svn: 224892

1 files changed, 23 insertions, 0 deletions

diff --git a/clang/test/SemaObjC/attr-deprecated-pch.m b/clang/test/SemaObjC/attr-deprecated-pch.m
new file mode 100644
index 00000000000..2b48aea379a
--- /dev/null
+++ b/clang/test/SemaObjC/attr-deprecated-pch.m
@@ -0,0 +1,23 @@
+// RUN: %clang_cc1 -fsyntax-only -DBOTH -verify %s
+// If the decls come from a pch, the behavior shouldn't change:
+// RUN: %clang_cc1 -x objective-c-header %s -emit-pch -o %t
+// RUN: %clang_cc1 -DUSES -include-pch %t -fsyntax-only -verify %s
+// expected-no-diagnostics
+
+// The slightly strange ifdefs are so that the command that builds the gch file
+// doesn't need any -D switches, for these would get embedded in the gch.
+
+#ifndef USES
+@interface Interface1
+- (void)partiallyUnavailableMethod;
+@end
+@interface Interface2
+- (void)partiallyUnavailableMethod __attribute__((unavailable));
+@end
+#endif
+
+#if defined(USES) || defined(BOTH)
+void f(id a) {
+  [a partiallyUnavailableMethod];  // no warning, `a` could be an Interface1.
+}
+#endif