[gcc r12-3221] Make sure -fexceptions is enabled when -fnon-call-exceptions is

[gcc r12-3221] Make sure -fexceptions is enabled when -fnon-call-exceptions is

[Richard Biener]

https://gcc.gnu.org/g:1313111fdec0d0de4228b5e839ca728b3e4b106e

commit r12-3221-g1313111fdec0d0de4228b5e839ca728b3e4b106e
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Aug 30 09:55:59 2021 +0200

    Make sure -fexceptions is enabled when -fnon-call-exceptions is
    
    This makes -fexceptions enabled by -fnon-call-exceptions, removing
    the odd state of !flag_exceptions && flag_non_call_exceptions from
    middle-end consideration.
    
    2021-08-30  Richard Biener  <rguenther@suse.de>
    
            * common.opt (fexceptions): Mark
            EnabledBy(fnon-call-exceptions).
            * doc/invoke.texi (fnon-call-exceptions): Document this
            enables -fexceptions.

Diff:
---
 gcc/common.opt      | 2 +-
 gcc/doc/invoke.texi | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/gcc/common.opt b/gcc/common.opt
index ed8ab5fbe13..7d69ab5ef7c 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -1509,7 +1509,7 @@ Common Var(flag_emit_class_debug_always) Init(0)
 Do not suppress C++ class debug information.
 
 fexceptions
-Common Var(flag_exceptions) Optimization
+Common Var(flag_exceptions) Optimization EnabledBy(fnon-call-exceptions)
 Enable exception handling.
 
 fexpensive-optimizations
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index b83bd902cec..f7bb193b51d 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -16410,7 +16410,8 @@ Note that this requires platform-specific runtime support that does
 not exist everywhere.  Moreover, it only allows @emph{trapping}
 instructions to throw exceptions, i.e.@: memory references or floating-point
 instructions.  It does not allow exceptions to be thrown from
-arbitrary signal handlers such as @code{SIGALRM}.
+arbitrary signal handlers such as @code{SIGALRM}.  This enables
+@option{-fexceptions}.
 
 @item -fdelete-dead-exceptions
 @opindex fdelete-dead-exceptions