[libunwind] r280669 - Add missing _US_ACTION_MASK constant to unwind.h

[Dimitry Andric via cfe-commits]

Author: dim
Date: Mon Sep  5 13:01:13 2016
New Revision: 280669

URL: http://llvm.org/viewvc/llvm-project?rev=280669&view=rev
Log:
Add missing _US_ACTION_MASK constant to unwind.h

Summary:
During building of recent compiler-rt sources on FreeBSD for arm, I
noticed that our unwind.h (which originates in libunwind) was missing
the `_US_ACTION_MASK` constant:

    compiler-rt/lib/builtins/gcc_personality_v0.c:187:18: error: use of undeclared identifier '_US_ACTION_MASK'
        if ((state & _US_ACTION_MASK) != _US_UNWIND_FRAME_STARTING)
                     ^

It appears that both clang's internal unwind.h, and libgcc's unwind.h
define this constant as 3, so let's add this to libunwind's version too.

Reviewers: logan, kledzik, davide, emaste

Subscribers: joerg, davide, aemerson, emaste, llvm-commits

Differential Revision: https://reviews.llvm.org/D24222

Modified:
    libunwind/trunk/include/unwind.h

Modified: libunwind/trunk/include/unwind.h
URL: http://llvm.org/viewvc/llvm-project/libunwind/trunk/include/unwind.h?rev=280669&r1=280668&r2=280669&view=diff
==============================================================================
--- libunwind/trunk/include/unwind.h (original)
+++ libunwind/trunk/include/unwind.h Mon Sep  5 13:01:13 2016
@@ -57,6 +57,7 @@ typedef uint32_t _Unwind_State;
 static const _Unwind_State _US_VIRTUAL_UNWIND_FRAME   = 0;
 static const _Unwind_State _US_UNWIND_FRAME_STARTING  = 1;
 static const _Unwind_State _US_UNWIND_FRAME_RESUME    = 2;
+static const _Unwind_State _US_ACTION_MASK            = 3;
 /* Undocumented flag for force unwinding. */
 static const _Unwind_State _US_FORCE_UNWIND           = 8;