You're receiving this bug because the package in Summary has produced _FORTIFY_SOURCE related warnings indicating the presence of a sure overflow in a static buffer.
Even though this is not always an indication of a security problem it might even be. So please check this out ASAP.
By the way, _FORTIFY_SOURCE is disabled when you disable optimisation, so don't try finding out the cause using -O0.
Your friendly neighborhood tinderboxer
Created attachment 247111 [details]
*** Bug 364315 has been marked as a duplicate of this bug. ***
Created attachment 309881 [details, diff]
The cause of the buffer overflow warnings is that sources/ld-tigcc/formats/tios.h has char Signature, when it expects an 8-character input. This is overflowing because there needs to be 9 elements allocated to include room for the null-terminator of the string. I think this patch is sufficient to fix it (I'm not familiar with how to use FORTIFY_SOURCE, but this eliminates the warnings about "warning: call to __builtin___strcpy_chk will always overflow destination buffer". There are also errors about "warning: array subscript is above array bounds" and likewise for below array bounds, I'll look at those next.
new beta8 version doesn't warn for me