> -----Ursprüngliche Nachricht----- > Von: Sebastian Huber [mailto:sebastian.hu...@embedded-brains.de] > Gesendet: Montag, 27. Februar 2017 13:46 > An: Sommer, Jan; devel@rtems.org > Betreff: Re: Undefined reference to `__sync_bool_compare_and_swap_4' for > some Leon configurations with gfortran > [...] > > If I check the different libgfortran.a libraries of > > sparc-rtems4.12/6.3.0 with nm I get libgfortran.a > > U __sync_bool_compare_and_swap_4 > > U __sync_bool_compare_and_swap_4 > > Is this reference generated by the compiler or some GCC runtime source code? > The atomic operations are implemented via the libatomic, so you should only > have __atomic_() references. >
I am not sure if I understand the question correctly. I checked the mentioned elf.c-file (https://gcc.gnu.org/viewcvs/gcc/branches/gcc-6-branch/libbacktrace/elf.c?view=markup#l960) and the call to __sync_bool_compare_and_swap_4 does not seem to be dependent on a configuration option of gcc. The same is true for dwarf.c There seems to have been a similar issue for hpux: https://patchwork.ozlabs.org/patch/553017/ Would it make sense to set libbacktrace_cv_sys_sync=no in the same way for the respective leon-targets? > > > > for the ones in the leon, soft and v8 directory. > > > > The libgfortran.a in the leon3 and leon3v7 directory do not have this > undefined symbol. > > They implement this atomic operation in hardware. > > > Is that correct behavior? If yes, which library do I need to add to the > > linker? > > It is a compiler or GCC runtime configuration issue. > > > > > > > Best regards, > > > > Jan > > > > > > > > Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) > > German Aerospace Center > > Simulation and Software Technology | Software for Space Systems and > Interactive Visualization | Lilienthalplatz 7 | 38108 Braunschweig | Germany > > > > Jan Sommer > > Telephone +49 531 295-2494 | Telefax 0531 295-2767 | jan.som...@dlr.de > > DLR.de/SC > > > > _______________________________________________ > > devel mailing list > > devel@rtems.org > > http://lists.rtems.org/mailman/listinfo/devel > > -- > Sebastian Huber, embedded brains GmbH > > Address : Dornierstr. 4, D-82178 Puchheim, Germany > Phone : +49 89 189 47 41-16 > Fax : +49 89 189 47 41-09 > E-Mail : sebastian.hu...@embedded-brains.de > PGP : Public key available on request. > > Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG. _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
