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

Breakpoint 1, 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 1, 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 1, 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 1, 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 1, strlen (str=0x7fffffffed56 "v") at /usr/src/lib/libc/string/strlen.c:99
99              lp = (const unsigned long *)((uintptr_t)str & ~LONGPTR_MASK);
(gdb)
Continuing.

Breakpoint 1, strlen (str=0x7fffffffed5e "E") at /usr/src/lib/libc/string/strlen.c:99
99              lp = (const unsigned long *)((uintptr_t)str & ~LONGPTR_MASK);
(gdb)
Continuing.

Breakpoint 1, strlen (str=0x7fffffffed61 "mtune=nocona") at /usr/src/lib/libc/string/strlen.c:99
99              lp = (const unsigned long *)((uintptr_t)str & ~LONGPTR_MASK);