On Tue, Oct 02, 2012 at 10:13:25AM +0200, Gunther Nikl wrote: > Michael Meissner wrote: > > Segher Boessenkool asked me on IRC to break out the fix in the last change. > > This patch is just the change to set the default options if the user did not > > use -mcpu=<xxx> and the compiler was not configured with --with-cpu=<xxx>. > > Here are the patches. > > Which GCC releases are affected by this bug?
All of them. Now, in general users don't see this bug, because distribution maintainers usually build with an explicit --with-cpu= option, which sets the default CPU in case the user did not use -mcpu=<xxx> on the command line. If neither option was used, the default "powerpc" or "powerpc64" is usually good enough. David noticed it when building AIX compilers, because he wanted to add a default option (-mmfcrf) to the aix*.h definitions to insure that the new get timebase builtin would generate the correct instructions by default (the original PowerPCs had a different SPR for the time base than the newer server machines starting with power4). He asked me to fix this bug before we tackle the infrastructure changes. -- Michael Meissner, IBM 5 Technology Place Drive, M/S 2757, Westford, MA 01886-3141, USA meiss...@linux.vnet.ibm.com fax +1 (978) 399-6899
