[gcc r13-5685] arm: Fix warning in libgcc/config/arm/pr-support.c

[Christophe Lyon <clyon@gcc.gnu.org>]

https://gcc.gnu.org/g:3dba5b2cf2d624921d976670b927bf5330da075c

commit r13-5685-g3dba5b2cf2d624921d976670b927bf5330da075c
Author: Christophe Lyon <christophe.lyon@arm.com>
Date:   Mon Jan 30 17:39:22 2023 +0100

    arm: Fix warning in libgcc/config/arm/pr-support.c
    
    I have noticed some warnings when building GCC for arm-eabi:
    pr-support.c:110:7: warning: variable ‘set_pac_sp’ set but not used [-Wunused-but-set-variable]
    pr-support.c:109:7: warning: variable ‘set_pac’ set but not used [-Wunused-but-set-variable]
    
    This small patch avoids them by defining these two variables undef
    TARGET_HAVE_PACBTI, like the code which actually uses them.
    
            libgcc/
            * config/arm/pr-support.c (__gnu_unwind_execute): Use
            TARGET_HAVE_PACBTI to define set_pac and set_pac_sp.

Diff:
---
 libgcc/config/arm/pr-support.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libgcc/config/arm/pr-support.c b/libgcc/config/arm/pr-support.c
index 9c9d4eed85f..6c36ab47756 100644
--- a/libgcc/config/arm/pr-support.c
+++ b/libgcc/config/arm/pr-support.c
@@ -106,8 +106,10 @@ __gnu_unwind_execute (_Unwind_Context * context, __gnu_unwind_state * uws)
 {
   _uw op;
   int set_pc;
+#if defined(TARGET_HAVE_PACBTI)
   int set_pac = 0;
   int set_pac_sp = 0;
+#endif
   _uw reg;
   _uw sp;
 
@@ -258,7 +260,9 @@ __gnu_unwind_execute (_Unwind_Context * context, __gnu_unwind_state * uws)
 	      if (_Unwind_VRS_Pop (context, _UVRSC_PAC, 0, _UVRSD_UINT32)
 		  != _UVRSR_OK)
 		return _URC_FAILURE;
+#if defined(TARGET_HAVE_PACBTI)
 	      set_pac = 1;
+#endif
 	      continue;
 	    }
 
@@ -266,7 +270,9 @@ __gnu_unwind_execute (_Unwind_Context * context, __gnu_unwind_state * uws)
 	  if (op == 0xb5)
 	    {
 	      _Unwind_VRS_Get (context, _UVRSC_CORE, R_SP, _UVRSD_UINT32, &sp);
+#if defined(TARGET_HAVE_PACBTI)
 	      set_pac_sp = 1;
+#endif
 	      continue;
 	    }