gdb gets SIGSEGV before calling main()

This about covers it:

jas@rpi3:~$ cat foo.cpp
#include <stdio.h>

int main (int argc, const char **argv)
{
        printf("hello, world\n");

        return 0;
}
jas@rpi3:~$ g++ foo.cpp
jas@rpi3:~$ gdb a.out
GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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Reading symbols from a.out...(no debugging symbols found)...done.
(gdb) r
Starting program: /home/jas/a.out

Program received signal SIGSEGV, Segmentation fault.
0x76fd9dde in ?? () from /lib/ld-linux-armhf.so.3
(gdb)

I can't image how this can be. It seems to happen on all images.