Fix Clang's __DEPRECATED define to be controled by -Wdeprecated. This

matches GCC behavior which libstdc++ uses to limit #warning-based
messages about deprecation.

The machinery involves threading this through a new '-fdeprecated-macro'
flag for CC1. The flag defaults to "on", similarly to -Wdeprecated. We
turn the flag off in the driver when the warning is turned off (modulo
matching some GCC bugs). We record this as a language option, and key
the preprocessor on the option when introducing the define.

A separate flag rather than a '-D' flag allows us to properly represent
the difference between C and C++ builds (only C++ receives the define),
and it allows the specific behavior of following -Wdeprecated without
potentially impacting the set of user-provided macro flags.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@130055 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/include/clang/Basic/LangOptions.h b/include/clang/Basic/LangOptions.h
index 91287815cd..2b1319c1a0 100644
--- a/include/clang/Basic/LangOptions.h
+++ b/include/clang/Basic/LangOptions.h
@@ -89,6 +89,8 @@ public:
                                   // used (instead of C99 semantics).
   unsigned NoInline          : 1; // Should __NO_INLINE__ be defined.
 
+  unsigned Deprecated        : 1; // Should __DEPRECATED be defined.
+
   unsigned ObjCGCBitmapPrint : 1; // Enable printing of gc's bitmap layout
                                   // for __weak/__strong ivars.
 
@@ -213,6 +215,8 @@ public:
     GNUInline = 0;
     NoInline = 0;
 
+    Deprecated = 1;  // -Wdeprecated defaults to "on".
+
     CharIsSigned = 1;
     ShortWChar = 0;
     ShortEnums = 0;