On Fri, Feb 22, 2013 at 10:40:10PM +0000, Dimitry Andric wrote: > Author: dim > Date: Fri Feb 22 22:40:10 2013 > New Revision: 247166 > URL: http://svnweb.freebsd.org/changeset/base/247166 > > Log: > Pull in r172354 from upstream clang trunk: > > Refactor the x86 CPU name logic in the driver and pass -march and -mcpu > flag information down from the Clang driver into the Gold linker plugin > for LTO. This allows specifying -march on the linker commandline and > should hopefully have it pass all the way through to the LTO optimizer. > > Fixes PR14697. > > Pull in r175919 from upstream clang trunk: > > Driver: Pass down the -march setting down to -cc1as on x86 too. > > The assembler historically didn't make use of any target features, but > this has > changed when support for old CPUs that don't support long nops was added. > > This should fix the long nops that still occurred in crt*.o, and > possibly other object files, if the system was compiled for a CPU that > does not support those, such as Geode. > > Note that gcc on i386 also does not pass through any -march, -mcpu or > -mtune setting to gas, but this has not caused any trouble yet, because > gas defaults to i386.
Are you saying that assembler (in the 'cc' invocation) miscompiles the .s files on i386 ? Why does it use instructions by default which are not supported on the i486 architecture, implicitely ?
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