Mark sysv.S as SafeSEH compatible (#438)
It contains no exception handler, so we can just emit the special
@feat.00 symbol to indicate that it's trivially SafeSEH compatible.
SafeSEH only applies to x86 and not x86-64, hence its inclusion in the
x86-specific block. See [1] for details.
[1] https://msdn.microsoft.com/en-us/library/windows/desktop/ms680547(v=vs.85).aspx#the_.sxdata_section_
diff --git a/src/x86/sysv.S b/src/x86/sysv.S
index 27379a4..52f307a 100644
--- a/src/x86/sysv.S
+++ b/src/x86/sysv.S
@@ -1035,6 +1035,15 @@
L(EFDE9):
#endif /* !FFI_NO_RAW_API */
+#ifdef _WIN32
+ .def @feat.00;
+ .scl 3;
+ .type 0;
+ .endef
+ .globl @feat.00
+@feat.00 = 1
+#endif
+
#endif /* ifndef _MSC_VER */
#endif /* ifndef __x86_64__ */
