[PATCH] Fix warning on gdb/compile/compile.c (C++-ify "triplet_rx")

[Simon Marchi]

On 2018-01-17 18:07, Sergio Durigan Junior wrote:
> On Wednesday, January 17 2018, Simon Marchi wrote:
> 
>> On 2018-01-16 14:46, Sergio Durigan Junior wrote:
>>> This fixes a GCC warning that happens when compiling
>>> gdb/compile/compile.c on some GCC versions (e.g., "gcc (GCC) 7.2.1
>>> 20180104 (Red Hat 7.2.1-6)").
>>> 
>>> It's a simple patch that converts "triplet_rx" from "char *" to
>>> "std::string", thus guaranteeing that it will be always initialized.
>>> 
>>> I've regtested this patch and did not find any regressions.  OK to
>>> apply on both master and 8.1 (after creating a bug for it)?
>>> 
>>> gdb/ChangeLog:
>>> 2018-01-16  Sergio Durigan Junior  <sergiodj@redhat.com>
>>> 
>>> 	* compile/compile.c (compile_to_object): Convert "triplet_rx"
>>> 	to "std::string".
>>> ---
>>>  gdb/compile/compile.c | 15 ++++++++-------
>>>  1 file changed, 8 insertions(+), 7 deletions(-)
>>> 
>>> diff --git a/gdb/compile/compile.c b/gdb/compile/compile.c
>>> index 2ee75930ac..47646169c8 100644
>>> --- a/gdb/compile/compile.c
>>> +++ b/gdb/compile/compile.c
>>> @@ -463,7 +463,7 @@ compile_to_object (struct command_line *cmd, 
>>> const
>>> char *cmd_string,
>>>    char **argv;
>>>    int ok;
>>>    struct gdbarch *gdbarch = get_current_arch ();
>>> -  char *triplet_rx;
>>> +  std::string triplet_rx;
>>>    char *error_message;
>>> 
>>>    if (!target_has_execution)
>>> @@ -527,15 +527,15 @@ compile_to_object (struct command_line *cmd,
>>> const char *cmd_string,
>>>      }
>>>    else
>>>      {
>>> -      const char *os_rx = osabi_triplet_regexp (gdbarch_osabi
>>> (gdbarch));
>>> -      const char *arch_rx = gdbarch_gnu_triplet_regexp (gdbarch);
>>> +      std::string os_rx = osabi_triplet_regexp (gdbarch_osabi
>>> (gdbarch));
>>> +      std::string arch_rx = gdbarch_gnu_triplet_regexp (gdbarch);
>> 
>> Making these std::string makes unnecessary copies.
>> 
>> You can write the line below like this:
>> 
>>   triplet_rx = std::string (arch_rx) + "(-[^-]*)?-" + os_rx;
>> 
>> Otherwise, LGTM.
> 
> Thanks, Simon.
> 
> Pushed to master:
> 
> 7d937cad0acdccd0ff485435fbe16f005e994c66
> 
> Is it OK to push this to the 8.1 branch as well?  If so, I'm not sure I
> should create a bug for this, or just go ahead and push it.

Yes, it is fine to go to the 8.1 branch.  A PR is not necessary right 
now.  They are only necessary after there was an initial release on the 
branch, to track what fixes were made on top of that initial version.

Simon