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Re: GCC 4.5

From: Bruce Dubbs
Subject: Re: GCC 4.5
Date: Thu, 20 May 2010 10:53:37 -0500
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20080722 SeaMonkey/1.1.11

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

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