On Thu, 18 Feb 2010, Jason Merrill wrote: > I periodically get bitten by bug 34115: a compiler configured without > --with-arch on i686-pc-linux-gnu doesn't support atomics. I think we would > only need to bump the default to i486 to get atomic support. Can we > reconsider the default for 4.5?
My position remains that configuring for i686-* should default to -march=i686 rather than -mtune=i686. http://gcc.gnu.org/ml/gcc/2008-06/msg00223.html http://gcc.gnu.org/ml/gcc/2008-08/msg00445.html Perhaps someone would like to review HJ's patch to that effect? http://gcc.gnu.org/ml/gcc-patches/2008-08/msg02078.html This will probably break building glibc, as problems building when __i686 is a predefined macro have been known since at least 2002 but none of the many patches proposed since then have been accepted. http://sourceware.org/ml/libc-alpha/2002-10/msg00156.html ... http://sourceware.org/ml/libc-alpha/2009-07/msg00072.html -- Joseph S. Myers jos...@codesourcery.com
