Add __has_feature(attribute_availability_with_message).

This tests for the ability to include a "message" field in availability
attributes, like so:

  extern void ATSFontGetName(const char *oName)
    __attribute__((availability(macosx,introduced=8.0,deprecated=9.0,
                                message="use CTFontCopyFullName")));

This was actually supported in Clang 3.1, but we got a request for a
__has_feature so that header files can use this more safely. It's
unfortunate that the 3.1 release doesn't include this, however.

<rdar://problem/11886458>

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160699 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Lex/PPMacroExpansion.cpp b/lib/Lex/PPMacroExpansion.cpp
index c9d400fc6611bcb524d954d8e7d3a60b1a70cd54..3a7f02cafbf7c69615507de608b3d5508d558df8 100644 (file)
--- a/lib/Lex/PPMacroExpansion.cpp
+++ b/lib/Lex/PPMacroExpansion.cpp
@@ -619,6 +619,7 @@ static bool HasFeature(const Preprocessor &PP, const IdentifierInfo *II) {
            .Case("address_sanitizer", LangOpts.AddressSanitizer)
            .Case("attribute_analyzer_noreturn", true)
            .Case("attribute_availability", true)
+           .Case("attribute_availability_with_message", true)
            .Case("attribute_cf_returns_not_retained", true)
            .Case("attribute_cf_returns_retained", true)
            .Case("attribute_deprecated_with_message", true)

diff --git a/test/Sema/attr-availability.c b/test/Sema/attr-availability.c
index a13e351a6e95c0438b9a8ea8e86956545b22f333..b4a6f9616df4fbdd9bd4d3fb7011d0a296736800 100644 (file)
--- a/test/Sema/attr-availability.c
+++ b/test/Sema/attr-availability.c
@@ -37,3 +37,9 @@ void f6(int) __attribute__((availability(ios,deprecated=4.0))); // expected-warn
 void f7(int) __attribute__((availability(ios,introduced=2.0)));
 void f7(int) __attribute__((availability(ios,deprecated=3.0))); // expected-note {{previous attribute is here}}
 void f7(int) __attribute__((availability(ios,deprecated=4.0))); // expected-warning {{availability does not match previous declaration}}
+
+
+// <rdar://problem/11886458>
+#if !__has_feature(attribute_availability_with_message)
+# error "Missing __has_feature"
+#endif