[gcc(refs/users/aoliva/heads/testme)] make -freg-struct-return visibly a negative alias of -fpcc-struct-return

[Alexandre Oliva <aoliva@gcc.gnu.org>]

https://gcc.gnu.org/g:4c42beadc660572409d3e6f452bf4c0209f320c3

commit 4c42beadc660572409d3e6f452bf4c0209f320c3
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Tue Apr 23 00:33:04 2024 -0300

    make -freg-struct-return visibly a negative alias of -fpcc-struct-return
    
    The fact that both options accept negative forms suggests that maybe
    they aren't negative forms of each other.  They are, but that isn't
    clear even by examining common.opt.  Use NegativeAlias to make it
    abundantly clear.
    
    The 'Optimization' keyword next to freg-struct-return was the only
    thing that caused flag_pcc_struct_return to be a per-function flag,
    and ipa-inline relied on that.  After making it an alias, the
    Optimization keyword was no longer operational.  I'm not sure it was
    sensible or desirable for flag_pcc_struct_return to be a per-function
    setting, but this patch does not intend to change behavior.
    
    
    for  gcc/ChangeLog
    
            * common.opt (freg-struct-return): Make it explicitly
            fpcc-struct-return's NegativeAlias.  Copy Optimization...
            (freg-struct-return): ... here.

Diff:
---
 gcc/common.opt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/common.opt b/gcc/common.opt
index ad348844775..12d93c76a1e 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -2406,7 +2406,7 @@ Common RejectNegative Joined UInteger Optimization
 -fpack-struct=<number>	Set initial maximum structure member alignment.
 
 fpcc-struct-return
-Common Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN)
+Common Var(flag_pcc_struct_return,1) Init(DEFAULT_PCC_STRUCT_RETURN) Optimization
 Return small aggregates in memory, not registers.
 
 fpeel-loops
@@ -2596,7 +2596,7 @@ Common Var(flag_record_gcc_switches)
 Record gcc command line switches in the object file.
 
 freg-struct-return
-Common Var(flag_pcc_struct_return,0) Optimization
+Common NegativeAlias Alias(fpcc_struct_return) Optimization
 Return small aggregates in registers.
 
 fregmove