>>> Robert Story <rst...@freesnmp.com> schrieb am 08.11.2016 um 22:15 in >>> Nachricht <20161108161524.606df...@freesnmp.com>: > On Tue, 8 Nov 2016 13:02:51 -0800 Bart wrote: > BVA> On 11/08/2016 12:17 PM, Robert Story wrote: > BVA> > Static buffers/arrays should be initialized before use. If > BVA> > you find any that are used before they are initialized, > BVA> > please file a bug and, if you can, submit a patch to fix > BVA> > them. > BVA> > BVA> Hello Robert, > BVA> > BVA> A quote from the C language standard (ISO/IEC 9899:201x): > BVA> "6.9.2 External object definitions. [...]" > BVA> > BVA> In other words, any toolchain that does not zero-initialize > BVA> static variables violates the C standard. I don't think we > BVA> should care about broken toolchains. > > Is that new in 201x? How far back does this go in the standards? > It's been a while, but the last time we discussed it, I believe the > decision was made to support C89 an later. I might have missed a > recent decision if that has changed, and of course we can revisit > that if enough folks agree we should.
AFAIK, it goes back to the first C compiler in UNIX where all uninitialized static data was placed in a BSS segment, and during program load that segment was zeroed (letting avoid putting multiple zeros in the executable file). Old C compilers in MS-DOS (1985 or so) also had the corresponding segment zeroed. Today's mechanisms may be different, but the effect should be the same. Ulrich > > Robert > > ------------------------------------------------------------------------------ > Developer Access Program for Intel Xeon Phi Processors > Access to Intel Xeon Phi processor-based developer platforms. > With one year of Intel Parallel Studio XE. > Training and support from Colfax. > Order your platform today. http://sdm.link/xeonphi > _______________________________________________ > Net-snmp-coders mailing list > Net-snmp-coders@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/net-snmp-coders ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today. http://sdm.link/xeonphi _______________________________________________ Net-snmp-coders mailing list Net-snmp-coders@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/net-snmp-coders
