Force inline without -O2

[Jie Zhang]

On 12/29/2009 01:31 AM, Thomas Martitz wrote:
> Am 28.12.2009 13:30, schrieb Jie Zhang:
>> On 12/28/2009 08:21 PM, Thomas Martitz wrote:
>>> Am 28.12.2009 04:22, schrieb Jie Zhang:
>>>> I think __attribute__((always_inline)) is used to inline functions
>>>> even not optimizing. Below is from GCC manual:
>>>>
>>>> always_inline
>>>> Generally, functions are not inlined unless optimization is
>>>> specified. For functions declared inline, this attribute inlines the
>>>> function even if no optimization level was specified.
>>>
>>>
>>> That just means that it's inlined under the implicit default
>>> optimization level -O1 (that is what you get "if no optimization level
>>> was specified"). If you set -O0, it will not inline. I had problem where
>>> -O0 broke code that is depended on being inlined.
>>>
>> GCC uses -O0 by default, not -O1.
>>
>>
>> Jie
>
> Hmm, ok, but it doesn't inline functions marked with
> __attribute__((always_inline)) with -O0. I tried that with gcc 4.4.2 for
> the arm-eabi target. Maybe it's a bug then, or maybe the manual means -O
> for "no optimization level specified"?
>
Do you have a test case to show this issue?


Jie