Problem with _FORTIFY_SOURCE with GCC 9.2.1 on Fedora 31

I am having some issues compiling on my desktop machine after the system was upgraded to Fedora 31.

When configuring with ./configure --disable-optimization --enable-debug (which leads to -g -O0 -gdwarf -fvar-tracking-assignments -pthread -Wall -Wextra -Wno-unused-parameter -Wshadow -Werror -Wstrict-prototypes) I get the following error message:

In file included from /usr/include/bits/libc-header-start.h:33,
                 from /usr/include/limits.h:26,
                 from /usr/lib/gcc/x86_64-redhat-linux/9/include/limits.h:194,
                 from /usr/lib/gcc/x86_64-redhat-linux/9/include/syslimits.h:7,
                 from /usr/lib/gcc/x86_64-redhat-linux/9/include/limits.h:34,
                 from space.c:29:
/usr/include/features.h:382:4: error: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Werror=cpp]
  382 | #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
      |    ^~~~~~~

I can get around that by forcing -O in the CFLAGS but that essentially means we are not fully disabling optimization any more.