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unwind.h: Add include guards and don't mess with visibility if HIDE_EXPORTS is specified. 

For GCC compatibility.

llvm-svn: 171991
This commit is contained in:
Benjamin Kramer 2013-01-09 19:54:57 +00:00
parent f9fc609fe7
commit 696651429d
1 changed files with 9 additions and 0 deletions
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9
clang/lib/Headers/unwind.h
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@ -23,6 +23,9 @@
/* See "Data Definitions for libgcc_s" in the Linux Standard Base.*/
#ifndef __CLANG_UNWIND_H
#define __CLANG_UNWIND_H
#if __has_include_next(<unwind.h>)
/* Darwin and libunwind provide an unwind.h. If that's available, use
* it. libunwind wraps some of its definitions in #ifdef _GNU_SOURCE,
@ -59,7 +62,9 @@ extern "C" {
/* It is a bit strange for a header to play with the visibility of the
symbols it declares, but this matches gcc's behavior and some programs
depend on it */
#ifndef HIDE_EXPORTS
#pragma GCC visibility push(default)
#endif
struct _Unwind_Context;
typedef enum {
@ -115,10 +120,14 @@ uintptr_t _Unwind_GetIP(struct _Unwind_Context* context);
typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)(struct _Unwind_Context*, void*);
_Unwind_Reason_Code _Unwind_Backtrace(_Unwind_Trace_Fn, void*);
#ifndef HIDE_EXPORTS
#pragma GCC visibility pop
#endif
#ifdef __cplusplus
}
#endif
#endif
#endif /* __CLANG_UNWIND_H */