Ok I just realized there is a "-Ur" option, aside from "-U -r".
You get alot otherwise undocumented flags with "gcc --help -v" BTW 2017-10-13 9:13 GMT+02:00 Norbert Lange <[email protected]>: > Hello, > > I tracked down the source of information to this: > https://wiki.ubuntu.com/SecurityTeam/PIE > > I changed the flags from "-Wl,-Ur" to "-Wl,-U -r", so you wont get an > explanation from me, why -U has to be passed for the linker. > And by the way, gcc accepts -U aswell, so this might be preferable to > be used directly too. > > I don`t know why those flags aren' t documented, bug in gcc > documentation? As far as I understand is that gcc is smart enough to > correctly deal with the flags gcc directly received, but the linker > lacks that information. > > I don' t know what the issue is with the C++ Constructors, in the > context of this change? > (I heard about the issues if those reside in a shared library, use > function from libcobald and don't depend on libcobald. Which is more > of a broken build to me if you don't add the depended libs, and will > bite you the same way if you use GCCs constructor attribute) > > Kind regards, > Norbert. > > 2017-10-12 10:33 GMT+02:00 Henning Schild <[email protected]>: >> Hey Norbert, >> >> thanks for looking into that again! Could you please explain how and >> why that works, or point out what to look at in flint? Mailing list >> thread, commit, something like that. >> >> As far as i can see gcc now gets a "-r" which i do not find in the >> manpage. And ld gets a "-U" which i do not find in its manpage. And >> there is something about c++ constructors which might change the >> behaviour of xenomai. >> >> Henning >> >> Am Tue, 10 Oct 2017 16:38:50 +0200 >> schrieb Norbert Lange <[email protected]>: >> >>> Some highly trivial fix attached! >>> Its strange that this flag is not documented in the manual (I found >>> out abaout this fix from https://launchpad.net/ubuntu/+source/flint) >>> >>> Norbert Lange >>> >>> 2017-08-10 11:49 GMT+02:00 Henning Schild >>> <[email protected]>: >>> > Hi Norbert, >>> > >>> > Thanks! In fact that issue has come up before and a similar >>> > workaround was described. It should be fixed, patches welcome! >>> > >>> > Henning >>> > >>> > Am Wed, 9 Aug 2017 16:21:02 +0200 >>> > schrieb Norbert Lange <[email protected]>: >>> > >>> >> Hello, >>> >> >>> >> Building the xenomai package won`t work because debian now >>> >> defaults to using pie, and the linker will complain with "ld: -r >>> >> and -pie may not be used together" >>> >> >>> >> A workaround for now is to add the flags manually: >>> >> ../xenomai-3.0.5/configure LDFLAGS=-no-pie CFLAGS="-fno-PIE >>> >> -fno-pie -no-pie" >>> >> >>> >> A real fix would be similar to >>> >> http://lists.gnu.org/archive/html/bug-grub/2016-11/msg00011.html >>> >> (no-pie is not supported on old and other compilers) >>> >> >>> >> Kind regards, >>> >> Norbert >>> >> >>> >> _______________________________________________ >>> >> Xenomai mailing list >>> >> [email protected] >>> >> https://xenomai.org/mailman/listinfo/xenomai >>> > >> _______________________________________________ Xenomai mailing list [email protected] https://xenomai.org/mailman/listinfo/xenomai
