Re: [PATCH for-4.2] hw/i386: Fix compiler warning when CONFIG_IDE_ISA is disabled

[Thomas Huth]

On 15/11/2019 17.13, Paolo Bonzini wrote:
> On 15/11/19 16:54, Thomas Huth wrote:
>> On 15/11/2019 16.54, Peter Maydell wrote:
>>> On Fri, 15 Nov 2019 at 15:10, Thomas Huth <address@hidden> wrote:
>>>>
>>>> When CONFIG_IDE_ISA is disabled, compilation currently fails:
>>>>
>>>>  hw/i386/pc_piix.c: In function ‘pc_init1’:
>>>>  hw/i386/pc_piix.c:81:9: error: unused variable ‘i’ 
>>>> [-Werror=unused-variable]
>>>>
>>>> Move the variable declaration to the right code block to avoid
>>>> this problem.
>>>>
>>>> Fixes: 4501d317b50e ("hw/i386/pc: Extract pc_i8259_create()")
>>>> Signed-off-by: Thomas Huth <address@hidden>
>>>> ---
>>>>  hw/i386/pc_piix.c | 3 +--
>>>>  1 file changed, 1 insertion(+), 2 deletions(-)
>>>>
>>>> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
>>>> index 2aefa3b8df..d187db761c 100644
>>>> --- a/hw/i386/pc_piix.c
>>>> +++ b/hw/i386/pc_piix.c
>>>> @@ -78,7 +78,6 @@ static void pc_init1(MachineState *machine,
>>>>      X86MachineState *x86ms = X86_MACHINE(machine);
>>>>      MemoryRegion *system_memory = get_system_memory();
>>>>      MemoryRegion *system_io = get_system_io();
>>>> -    int i;
>>>>      PCIBus *pci_bus;
>>>>      ISABus *isa_bus;
>>>>      PCII440FXState *i440fx_state;
>>>> @@ -253,7 +252,7 @@ static void pc_init1(MachineState *machine,
>>>>      }
>>>>  #ifdef CONFIG_IDE_ISA
>>>>  else {
>>>> -        for(i = 0; i < MAX_IDE_BUS; i++) {
>>>> +        for (int i = 0; i < MAX_IDE_BUS; i++) {
>>>>              ISADevice *dev;
>>>>              char busname[] = "ide.0";
>>>>              dev = isa_ide_init(isa_bus, ide_iobase[i], ide_iobase2[i],
>>>
>>> Don't put variable declarations inside 'for' statements,
>>> please. They should go at the start of a {} block.
>>
>> Why? We're using -std=gnu99 now, so this should not be an issue anymore.
> 
> For now I can squash the following while we discuss coding standards. :)
> 
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index fa62244f4d..0130b8fb4e 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -244,7 +244,8 @@ static void pc_init1(MachineState *machine,
>      }
>  #ifdef CONFIG_IDE_ISA
>  else {
> -        for (int i = 0; i < MAX_IDE_BUS; i++) {
> +        int i;
> +        for (i = 0; i < MAX_IDE_BUS; i++) {
>              ISADevice *dev;
>              char busname[] = "ide.0";
>              dev = isa_ide_init(isa_bus, ide_iobase[i], ide_iobase2[i],

Yes, please do. I guess we won't update CODING_STYLE.rst during the hard
freeze anymore ;-)

 Thomas