msvc: do not pretend to support all signals

This special-cases various signals that are not supported on Windows,
such as SIGPIPE. These cause the UCRT to throw asserts (at least in
debug mode).

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

compat/mingw.c

@@ -2119,8 +2119,33 @@ int mingw_raise(int sig)
 			sigint_fn(SIGINT);
 		return 0;
 
+#if defined(_MSC_VER)
+	case SIGILL:
+	case SIGFPE:
+	case SIGSEGV:
+	case SIGTERM:
+	case SIGBREAK:
+	case SIGABRT:
+	case SIGABRT_COMPAT:
+		/*
+		 * The <signal.h> header in the MS C Runtime defines 8 signals
+		 * as being supported on the platform. Anything else causes an
+		 * "Invalid signal or error" (which in DEBUG builds causes the
+		 * Abort/Retry/Ignore dialog). We by-pass the CRT for things we
+		 * already know will fail.
+		 */
+		return raise(sig);
+	default:
+		errno = EINVAL;
+		return -1;
+
+#else
+
 	default:
 		return raise(sig);
+
+#endif
+
 	}
 }