linux-unwind.h (alpha_fallback_frame_state): Cast 'mcontext_t *'…

linux-unwind.h (alpha_fallback_frame_state): Cast 'mcontext_t *' &rt_->uc.uc_mcontext to 'struct sigcontext *'.

	* config/alpha/linux-unwind.h (alpha_fallback_frame_state):
	Cast 'mcontext_t *' &rt_->uc.uc_mcontext to 'struct sigcontext *'.

From-SVN: r269053

libgcc/ChangeLog

+2019-02-20  Uroš Bizjak  <ubizjak@gmail.com>
+
+	* config/alpha/linux-unwind.h (alpha_fallback_frame_state):
+	Cast 'mcontext_t *' &rt_->uc.uc_mcontext to 'struct sigcontext *'.
+
 2019-02-19  Uroš Bizjak  <ubizjak@gmail.com>
 
 	* unwind-dw2.c (_Unwind_GetGR) [DWARF_ZERO_REG]: Compare

libgcc/config/alpha/linux-unwind.h

@@ -53,7 +53,10 @@ alpha_fallback_frame_state (struct _Unwind_Context *context,
 	siginfo_t info;
 	ucontext_t uc;
       } *rt_ = context->cfa;
-      sc = &rt_->uc.uc_mcontext;
+      /* The void * cast is necessary to avoid an aliasing warning.
+         The aliasing warning is correct, but should not be a problem
+         because it does not alias anything.  */
+      sc = (struct sigcontext *) (void *) &rt_->uc.uc_mcontext;
     }
   else
     return _URC_END_OF_STACK;