On Sun, Mar 18, 2018 at 7:56 PM, Ramsay Jones
<ramsay@xxxxxxxxxxxxxxxxxxxx> wrote:
>
>
> On 18/03/18 15:55, Duy Nguyen wrote:
>> On Sun, Mar 18, 2018 at 9:18 AM, Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx> wrote:
>>> +ifneq ($(or $(filter gcc6,$(COMPILER_FEATURES)),$(filter clang4,$(COMPILER_FEATURES))),)
>>> +CFLAGS += -Wextra
>>
>> Another thing we can add here is -Og instead of standard -O2 (or -O0
>> in my build), which is supported since gcc 4.8. clang seems to support
>> it too (mapped to -O1 at least for clang5) but I don't know what
>> version added that flag.
>
> I've been doing a lot of compiling recently, using 10 'different'
> versions of clang and gcc ('different' if you count 64-bit and 32-bit
> compilers with the same version number as different!)
>
> However, I can tell you that clang version 3.4 and 3.8.0 don't
> support -Og, but clang version 5.0.1 does.
Yeah. I checked clang git mirror and this -Og is in 4.x release branch
(couldn't nail down exact release) so 5.x should be a safe bet.
--
Duy
