Compiling the following with
g++ -fsanitize=address 
int main()
{
int offset=1;
char buf[offset]="";
}

I get the following:

p.C:5:1: internal compiler error: in tree_to_uhwi, at tree.c:7345
 }
 ^
0xff3be2 tree_to_uhwi(tree_node const*)
	/home/vitti/gcc7/gcc/tree.c:7345
0xd8005e asan_add_global
	/home/vitti/gcc7/gcc/asan.c:2268
0xd80a74 add_string_csts(constant_descriptor_tree**, asan_add_string_csts_data*)
	/home/vitti/gcc7/gcc/asan.c:2478
0xd80fca void hash_table<tree_descriptor_hasher, xcallocator>::traverse_noresize<asan_add_string_csts_data*, &(add_string_csts(constant_descriptor_tree**, asan_add_string_csts_data*))>(asan_add_string_csts_data*)
	/home/vitti/gcc7/gcc/hash-table.h:950
0xd80fca void hash_table<tree_descriptor_hasher, xcallocator>::traverse<asan_add_string_csts_data*, &(add_string_csts(constant_descriptor_tree**, asan_add_string_csts_data*))>(asan_add_string_csts_data*)
	/home/vitti/gcc7/gcc/hash-table.h:972
0xd80fca asan_finish_file()
	/home/vitti/gcc7/gcc/asan.c:2550