RFC: Changing AC_PROG_CC to AC_PROG_CC_C99 in top level configure

[Jeff Law]

On 4/30/2021 12:36 PM, Simon Marchi via Gcc-patches wrote:
> On 2021-04-26 7:32 a.m., Nick Clifton via Gdb-patches wrote:> Hi Guys,
>>    Given that gcc, gdb and now binutils are all now requiring C99 as a
>>    minimum version of C, are there any objections to updating
>>    configure.ac to reflect this ?
>>
>> Cheers
>>    Nick
>>
>> diff --git a/configure.ac b/configure.ac
>> index a721316d07b..59b4194fb24 100644
>> --- a/configure.ac
>> +++ b/configure.ac
>> @@ -1278,7 +1278,7 @@ else
>>     WINDMC_FOR_BUILD="\$(WINDMC)"
>>   fi
>>
>> -AC_PROG_CC
>> +AC_PROG_CC_C99
>>   AC_PROG_CXX
>>
>>   # We must set the default linker to the linker used by gcc for the correct
> Hi Nick,
>
> I think this fix is obvious enough, I encourage you to push it, that
> will fix the build failure many people get in opcodes/ppc-dis.c.  We'll
> just remove the line later when we upgrade to Autoconf 2.71, as simple
> as that.  For now we use 2.69.  If that matters, you have my OK for the
> GDB side of things.

That works for me.  I'd just sent Alan the trivial patch to make 
ppc-dis.c compile again with C89, but if we're going to update 
configure.ac appropriately, then it wouldn't be needed.


Jeff