GCC 4.5

GCC 4.5

[Vladimir 'φ-coder/phcoder' Serbinenko]

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Hello, all. I've noticed that GCC 4.5 is released and is available in
debian. With this version -mregparam=3 bug is fixed. So I intend to
remove all NESTED_FUNC_ATTR and use -mregparm=3 only on gcc >=4.5 and
-mregparam=1 otherwise. This has the disadvatantage of increasing binary
size with pre-4.5 gcc but it also greatly reduces the bug surface and so
will eventually result in better quality. Any oppositions?
I do not intend to require gcc 4.5, only highly recommend it.

-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko



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Re: GCC 4.5

[Bruce Dubbs]

Vladimir 'φ-coder/phcoder' Serbinenko wrote:
> Hello, all. I've noticed that GCC 4.5 is released and is available in
> debian. With this version -mregparam=3 bug is fixed. So I intend to
> remove all NESTED_FUNC_ATTR and use -mregparm=3 only on gcc >=4.5 and
> -mregparam=1 otherwise. This has the disadvatantage of increasing binary
> size with pre-4.5 gcc but it also greatly reduces the bug surface and so
> will eventually result in better quality. Any oppositions?
> I do not intend to require gcc 4.5, only highly recommend it.

There have been reports of problems with -Os in gcc-4.5.0.  In one case, 
the linux kernel is not functional. Specifically the file 
arch/x86/kernel/tsc.c causes a kernel panic.

I advise caution in this area.

   -- Bruce