On 3/8/20 2:37 PM, Pieter van Oostrum wrote:
> gdb) p (char *) &lispsym
> $35 = 0x100a38d30 "\230\001"

In that case, I expect the attached patch to work around the clang bug (and it 
is a bug in clang - clang is not outputting 'lispsym' debug info anywhere but in 
lread.o). Please give this patch a try and (assuming it works) go on to 
debugging the original problem.