On Thu, 10 Mar 2022 19:54:48 -0300 Dan Gora <d...@adax.com> wrote: > On Thu, Mar 10, 2022 at 11:46 AM Sanford, Robert <rsanf...@akamai.com> wrote: > > > > Hello All, > > > > We build a DPDK 21.05 app on Intel x86 machines with RDSEED in cpuflags, > > and may run it on machines *without* RDSEED. > > This results in a fatal error ... > > ERROR: This system does not support "RDSEED". > > Please check that RTE_MACHINE is set correctly. > > EAL: FATAL: unsupported cpu type. > > > > I try adding -Dplatform=haswell when running meson, (because gcc man page > > indicates that haswell is last arch w/o RDSEED) but get the same result. > > Until we resolve it, our workaround is changing the error-out in > > rte_cpu_is_supported() to just print a warning and continue. > > We don't have direct access to automated build machines, we go through > > change request processes, and so we can't rapidly try too many things. > > > > Is there a better meson option, such as machine=haswell, or something else > > that will work? > > > > Thanks in advance, > > Robert Sanford > > I tried four times to get a simple fix for this (and the lack of > getentropy() on older glibc) to determine the entropy source at run > time and got nothing but an endless raft of shit and ridiculous > criticisms that I completely gave up trying to contribute to DPDK ever > again. > > The DPDK developers think that it's your responsibility to have a > separate build system for each of your target systems and platforms > and that if you don't you're basically a big dummy. > > Don't believe me? Go look through the archives: > > "[PATCH 2/2] eal: resolve getentropy at run time for random seed" > "[PATCH v4 2/2] eal: emulate glibc getentropy for initial random seed". > > I suggest that you just fork DPDK and use one of those patches and > just maintain a separate DPDK tree. That's what I did. It's way > easier than trying to get anything upstream. > > thanks > dan
The ideal solution would be able to use gcc function attributes and dyanmic linking to do this at runtime - ie multiversion library. But this opens a set of different problems like compiler versions and testing.
