Re: Force inline without -O2

[Thomas Martitz <thomas dot martitz at student dot HTW-Berlin dot de>]

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"?

Best regards.