Hi, sounds like a tough situation and printfs() might be the easiest but I thought I might suggest one other complicated idea :-). Surely someone has put together a cross-compiler for this os/hw combination? the idea of compiling on-device would certainly have been impossibly slow until fairly recent times.
Regards, Tim On 19 November 2016 at 22:03, Jaak Ristioja <j...@ristioja.ee> wrote: > Hi! > > On 13.11.2016 07:37, Tim Murphy wrote: > > Something like Valgrind might spot some initial problem that doesn't > > immediately crash but eventually spirals out of control. > > I could try valgrind, but (1) I will need to recompile glibc with debug > symbols to use it, and (2) I don't have an eternity to wait for > --trace-children to finish, so I'd have to run it without > --trace-children because afaik valgrind doesn't provide good means to > trace only certain children (i.e. only "make" processes). Actually the > RPi2 would probably OOM/die from multiple valgrind processes anyway. > > > I don't know what the gcc version is on your Pi but if you have a recent > > enough one you might manage to use the address sanitiser option to get > > a similar result. > > I'm currently using GCC 5.4, so its fairly new from that aspect, but I > won't be able to use its address sanitizer, because it doesn't work with > a PaX/grsecurity kernel like Gentoo's sys-devel/hardened-sources, due to > "ASAN assumes/uses hardcoded userland address space size values, which > breaks when UDEREF is set as it pitches a bit from the size" [1]. > Because of this, it is disabled by default on hardened profiles, hence > I'd have to both recompile GCC and a kernel without PaX/grsec to > > So I guess I'll attempt to recompile glibc and run valgrind on the > parent "make -j5" process and see whether that turns up anything. If > not, then I'll try the -fsanitize=address approach. I expect all of this > to take some time (and perhaps wear out more flash storage) on the slow > RPi2. > > Best regards, > J > > > [1] http://blog.siphos.be/2013/04/another-gentoo-hardened-month- > has-passed/ > > _______________________________________________ > Bug-make mailing list > Bug-make@gnu.org > https://lists.gnu.org/mailman/listinfo/bug-make >
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