PIE disabled. Absolute addressing when asm programming with gcc on mac OS X

Question

I wrote this code. I want to compile it by gcc on mac OS X. But it appear 'PIE disabled. Absolute addressing' when I run gcc.

I googled it, but I can't find solution. Please advise me.

hello.s

.data
hello: .string "Hello World!\n"

.text
.globl _main

_main:
    push %rbp
    mov %rsp, %rbp
    movabs $hello, %rdi
    call _printf
    leave
    ret

error

ld: warning: PIE disabled. Absolute addressing (perhaps -mdynamic-no-pic) not allowed in
code signed PIE, but used in _main from /var/folders/xs/4z9kr_n93111fhv9_j1dd9gw0000gn/T/ex2_64-369300.o. 
To fix this warning, don't compile with -mdynamic-no-pic or link with -Wl,-no_pie

Answer 1

Looks like there are a couple solutions:

1. Link with -Wl,-no_pie:

clang -o hello hello.s -Wl,-no_pie

2. Don't use absolute addressing.

.data
hello: .string "Hello World!\n"

.text
.globl _main

_main:
    push %rbp
    mov %rsp, %rbp
    lea hello(%rip), %rdi
    mov $0, %rax
    call _printf
    leave
    ret

Then you can compile and run:

host % clang -o hello hello.s            
host % ./hello 
Hello World!

The bit about zeroing out al is mentioned in section 3.5.7 of System V Application Binary Interface. Here's the relevant excerpt:

When a function taking variable-arguments is called, %al must be set to the total num- ber of floating point parameters passed to the function in vector registers.

In your case this is zero. You are passing in zero floating point parameters.