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[avr-gcc-list] avr-gcc 4.5.3 in Debian/Ubuntu has call-prologues bug

From: Dale Whitfield
Subject: [avr-gcc-list] avr-gcc 4.5.3 in Debian/Ubuntu has call-prologues bug
Date: Sun, 22 Jan 2012 10:01:24 +0200
User-agent: Mutt/1.5.21 (2010-09-15)


A warning that this version has the bug as described and fixed by Georg
below. The fix was targeted for 4.6.2

[avr]: call-prologues saving/restoring global register variables

avr-gcc 4.5.3 is in:
Debian: wheezy(testing) and sid(unstable)
Ubuntu: oneiric(current release) and precise(next release)

Compiling without -mcall-prologues appears to be fine.

I had no problems with 4.3.5 and since this bug can result in erratic
behaviour (R7 global register is saved/restored by prolog/epilog when it
shouldn't be), I was wondering whether there are any thoughts on the
best action.

Either backport the fix to 4.5.x or move ahead to 4.6.x. Opinions?




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