[newlib-cygwin] Cygwin: strace: ignore GCC exceptions

[Ken Brown <kbrown@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=a93a85a1ff3ca937dabb1d985381b27836ce1bfc

commit a93a85a1ff3ca937dabb1d985381b27836ce1bfc
Author: Ken Brown <kbrown@cornell.edu>
Date:   Thu Aug 20 09:47:47 2020 -0400

    Cygwin: strace: ignore GCC exceptions
    
    Any C++ app that calls 'throw' on 64-bit Cygwin results in an
    exception of type STATUS_GCC_THROW (0x20474343) generated by the C++
    runtime.  Don't pollute the strace output by printing information
    about this and other GCC exceptions.

Diff:
---
 winsup/utils/strace.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/winsup/utils/strace.cc b/winsup/utils/strace.cc
index 9b6569a70..b96ad40c1 100644
--- a/winsup/utils/strace.cc
+++ b/winsup/utils/strace.cc
@@ -25,6 +25,7 @@ details. */
 #include "../cygwin/include/sys/cygwin.h"
 #include "../cygwin/include/cygwin/version.h"
 #include "../cygwin/cygtls_padsize.h"
+#include "../cygwin/gcc_seh.h"
 #include "path.h"
 #undef cygwin_internal
 #include "loadlib.h"
@@ -790,6 +791,13 @@ proc_child (unsigned mask, FILE *ofile, pid_t pid)
 	    case STATUS_BREAKPOINT:
 	    case 0x406d1388:		/* SetThreadName exception. */
 	      break;
+#ifdef __x86_64__
+	    case STATUS_GCC_THROW:
+	    case STATUS_GCC_UNWIND:
+	    case STATUS_GCC_FORCED:
+	      status = DBG_EXCEPTION_NOT_HANDLED;
+	      break;
+#endif
 	    default:
 	      status = DBG_EXCEPTION_NOT_HANDLED;
 	      if (ev.u.Exception.dwFirstChance)