On 06/27/2017 05:53 PM, Michael Meissner wrote: > The PowerPC __builtin_cpu_supports and __builtin_cpu_is built-in functions > require GLIBC 2.23, since they use fixed words at the end of thread control > area to store the HWCAP and HWCAP2 bits. If the compiler was not configured > with the appropriate GLIBC, the compiler will generate a 0 as the result of > the > built-in function call. > > I've been adding the target_clone attribute support to GCC, and the resolver > function uses __builtin_cpu_supports to detect which hardware ISA is being > used. On systems with an older GLIBC, only the default clone function will > get > called because __builtin_cpu_supports returns 0. > > This adds a target supports option in dejagnu so that future tests can use > this > to determine whether or not to test target_clones. > > I have verified that this patch works with the patches I plan to submit > tomorrow for enhancing the PowerPC target_clone support. > > Can I install this into the trunk? > > Given that GCC 7 supports __builtin_cpu_is and __builtin_cpu_supports, I would > ask if I could backport this to GCC 7.x as well to allow future tests to be > back ported. > > 2017-06-27 Michael Meissner <meiss...@linux.vnet.ibm.com> > > PR target/81193 > * lib/target-supports.exp > (check_ppc_cpu_supports_hw_available): New test to make sure > __builtin_cpu_supports works on power7 and newer. OK for the trunk. It's not my call on the release branches though.
jeff
