`gdb -v -x c -E -mtune=native /dev/null`:

Breakpoint 26, strlen (str=0x7fffffffed6e "/dev/null") at /usr/src/lib/libc/string/strlen.c:99
99              lp = (const unsigned long *)((uintptr_t)str & ~LONGPTR_MASK);
(gdb)
Continuing.

Breakpoint 26, strlen (str=0x7fffffffed73 "null") at /usr/src/lib/libc/string/strlen.c:99
99              lp = (const unsigned long *)((uintptr_t)str & ~LONGPTR_MASK);
(gdb)
Continuing.

Breakpoint 26, strlen (str=0x43e04a "include") at /usr/src/lib/libc/string/strlen.c:99
99              lp = (const unsigned long *)((uintptr_t)str & ~LONGPTR_MASK);
(gdb)
Continuing.

Breakpoint 26, strlen (str=0x458a30 "") at /usr/src/lib/libc/string/strlen.c:99
99              lp = (const unsigned long *)((uintptr_t)str & ~LONGPTR_MASK);
(gdb)
Continuing.

Breakpoint 26, strlen (str=0x458a30 "") at /usr/src/lib/libc/string/strlen.c:99
99              lp = (const unsigned long *)((uintptr_t)str & ~LONGPTR_MASK);
(gdb)
Continuing.

Breakpoint 26, strlen (str=0x43e5eb "-m") at /usr/src/lib/libc/string/strlen.c:99
99              lp = (const unsigned long *)((uintptr_t)str & ~LONGPTR_MASK);
(gdb)
Continuing.

Breakpoint 26, strlen (str=0x80a2d8 <Error reading address 0x80a2d8: Bad address>) at /usr/src/lib/libc/string/strlen.c:99
99              lp = (const unsigned long *)((uintptr_t)str & ~LONGPTR_MASK);