RFA: Set default optimization level to -O2 for -flto

[Basile Starynkevitch]

H.J. Lu wrote:
> 
> Should we record compiler options in .o files? For some targets, you may need
> -fPIC with -flto if -fPIC is used to build .o files.


I thought it was already the case....

Anyway, to check compatibility of compile versus link time optimisation 
flag, we need to store them somewhere...

But yes, I believe that at least in -flto mode, we better should store 
all the compile flags (those listed in comments when running 
-fverbose-asm -S) somewhere in the object file.

BTW, are we talking about patching 4.5 before its release or about 4.6?

If 4.5 can be patched to improve a new feature, I respectfully ask for 
someone to review the
http://gcc.gnu.org/ml/gcc-patches/2010-03/msg00644.html patch which 
enables short plugin names like -fplugin=treehydra instead of 
-fplugin=/some/distribution/path/to/treehydra.so

Cheers
-- 
Basile STARYNKEVITCH         http://starynkevitch.net/Basile/
email: basile<at>starynkevitch<dot>net mobile: +33 6 8501 2359
8, rue de la Faiencerie, 92340 Bourg La Reine, France
*** opinions {are only mines, sont seulement les miennes} ***