[gcc r11-11341] Objective-C: Default flag_objc_sjlj_exceptions off for NeXT ABI >= 2.

[Iain D Sandoe <iains@gcc.gnu.org>]

https://gcc.gnu.org/g:895bb1b2eb82e76d3bfc48bf35a0bbafae82d873

commit r11-11341-g895bb1b2eb82e76d3bfc48bf35a0bbafae82d873
Author: Matt Jacobson <mhjacobson@me.com>
Date:   Thu Jul 29 09:57:23 2021 +0100

    Objective-C: Default flag_objc_sjlj_exceptions off for NeXT ABI >= 2.
    
    Signed-off-by: Matt Jacobson <mhjacobson@me.com>
    
    gcc/c-family/ChangeLog:
    
            * c-opts.c (c_common_post_options): Default to
            flag_objc_sjlj_exceptions = 1 only when flag_objc_abi < 2.
    
    gcc/objc/ChangeLog:
    
            * objc-next-runtime-abi-02.c
            (objc_next_runtime_abi_02_init): Warn about and reset
            flag_objc_sjlj_exceptions regardless of flag_objc_exceptions.
            (next_runtime_02_initialize): Use a checking assert that
            flag_objc_sjlj_exceptions is off.
    
    (cherry picked from commit 798666392b512a585f0de2983a5d3423e960959e)

Diff:
---
 gcc/c-family/c-opts.c               | 4 ++--
 gcc/objc/objc-next-runtime-abi-02.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/gcc/c-family/c-opts.c b/gcc/c-family/c-opts.c
index 6f001e0bb6c..5bfa239ec0b 100644
--- a/gcc/c-family/c-opts.c
+++ b/gcc/c-family/c-opts.c
@@ -852,9 +852,9 @@ c_common_post_options (const char **pfilename)
   else if (!flag_gnu89_inline && !flag_isoc99)
     error ("%<-fno-gnu89-inline%> is only supported in GNU99 or C99 mode");
 
-  /* Default to ObjC sjlj exception handling if NeXT runtime.  */
+  /* Default to ObjC sjlj exception handling if NeXT runtime < v2.  */
   if (flag_objc_sjlj_exceptions < 0)
-    flag_objc_sjlj_exceptions = flag_next_runtime;
+    flag_objc_sjlj_exceptions = (flag_next_runtime && flag_objc_abi < 2);
   if (flag_objc_exceptions && !flag_objc_sjlj_exceptions)
     flag_exceptions = 1;
 
diff --git a/gcc/objc/objc-next-runtime-abi-02.c b/gcc/objc/objc-next-runtime-abi-02.c
index 2f18b04e34a..2a4f87cc726 100644
--- a/gcc/objc/objc-next-runtime-abi-02.c
+++ b/gcc/objc/objc-next-runtime-abi-02.c
@@ -245,7 +245,7 @@ objc_next_runtime_abi_02_init (objc_runtime_hooks *rthooks)
 {
   extern_names = ggc_cleared_vec_alloc<hash> (SIZEHASHTABLE);
 
-  if (flag_objc_exceptions && flag_objc_sjlj_exceptions)
+  if (flag_objc_sjlj_exceptions)
     {
       inform (UNKNOWN_LOCATION,
 	      "%<-fobjc-sjlj-exceptions%> is ignored for "
@@ -511,7 +511,7 @@ static void next_runtime_02_initialize (void)
   objc_getPropertyStruct_decl = NULL_TREE;
   objc_setPropertyStruct_decl = NULL_TREE;
 
-  gcc_assert (!flag_objc_sjlj_exceptions);
+  gcc_checking_assert (!flag_objc_sjlj_exceptions);
 
   /* Although we warn that fobjc-exceptions is required for exceptions
      code, we carry on and create it anyway.  */