Re: [patch 00/2] improve .text size on gcc 4.0 and newer compilers

[Dave Jones]

On Thu, Dec 29, 2005 at 08:41:07AM +0100, Ingo Molnar wrote:
 > 
 > * Krzysztof Halasa <khc@xxxxxxxxx> wrote:
 > 
 > > Ingo Molnar <mingo@xxxxxxx> writes:
 > > 
 > > >>    gcc version 4.0.2 20051109 (Red Hat 4.0.2-6)
 > > 
 > > > another thing: i wanted to decrease the size of -Os 
 > > > (CONFIG_CC_OPTIMIZE_FOR_SIZE) kernels, which e.g. Fedora uses too (to 
 > > > keep the icache footprint down).
 > > 
 > > Remember the above gcc miscompiles the x86-32 kernel with -Os:
 > > 
 > > https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=173764
 > 
 > i'm not sure what the point is. There was no sudden rush of -Os related 
 > bugs when Fedora switched to it for the kernel, and the 35% code-size 
 > savings were certainly worth it in terms of icache footprint. Yes, -Os 
 > is a major change for how the compiler works, and the kernel is a major 
 > piece of software.

The bug referenced is also fixed in gcc 4.1

		Dave

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/