On Tue, 2019-02-26 at 23:34 +0100, Hauke Mehrtens wrote: > > > Paul Fertser did some further analysis of this problem and we can now > reproduce it also on normal x86 systems when the binary is compiled like > this: > CFLAGS=" -Os -flto" LDFLAGS=" -flto" make > > -O3 or -Os and link time optimization is needed to see this problem. > > With LTO the compiler randomly reorders the __section_* variables > including __section_set and __section_get and that leads to wrong offset > used to traverse the __cmd section.
Yes, looks like stuff going into the __cmd section is no longer guaranteed to be in the same order as in the files, which sort of makes sense. Therefore, the trick I used to determine how densely the linker packs this no longer works. However, we can use the same trick with a different section, so I've just committed a fix for this. johannes
