[PATCH] Cygwin: strace: ignore GCC exceptions

[Ken Brown via Cygwin-patches]

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.
---
 winsup/utils/strace.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/winsup/utils/strace.cc b/winsup/utils/strace.cc
index 9b6569a70..2b317012d 100644
--- a/winsup/utils/strace.cc
+++ b/winsup/utils/strace.cc
@@ -790,6 +790,13 @@ proc_child (unsigned mask, FILE *ofile, pid_t pid)
            case STATUS_BREAKPOINT:
            case 0x406d1388:            /* SetThreadName exception. */
              break;
+#ifdef __x86_64__
+           case 0x20474343:            /* STATUS_GCC_THROW. */
+           case 0x21474343:            /* STATUS_GCC_UNWIND. */
+           case 0x22474343:            /* STATUS_GCC_FORCED. */
+             status = DBG_EXCEPTION_NOT_HANDLED;
+             break;
+#endif
            default:
              status = DBG_EXCEPTION_NOT_HANDLED;
              if (ev.u.Exception.dwFirstChance)
-- 
2.28.0