Static binaries on OSX with syscall on Crystal

Static binaries on OSX is a hard issue, but Go achieved by using syscall directly.

There is syscall package on Crystal too. Basic code is as following.

...
str = "Hello, World!\n"
syscall(WRITE, 1_u64, str.to_unsafe, str.size.to_u64)
syscall(EXIT)

% objdump -d hello

hello:  file format Mach-O 64-bit x86-64

Disassembly of section __TEXT,__text:
__text:
    1f60:       48 89 35 99 00 00 00    movq    %rsi, 153(%rip)
    1f67:       c3      retq
    1f68:       0f 1f 84 00 00 00 00 00         nopl    (%rax,%rax)
    1f70:       55      pushq   %rbp
    1f71:       48 89 e5        movq    %rsp, %rbp
    1f74:       48 8d 35 31 00 00 00    leaq    49(%rip), %rsi
    1f7b:       b8 04 00 00 02  movl    $33554436, %eax
    1f80:       bf 01 00 00 00  movl    $1, %edi
    1f85:       ba 0e 00 00 00  movl    $14, %edx
    1f8a:       0f 05   syscall
    1f8c:       b8 01 00 00 02  movl    $33554433, %eax
    1f91:       0f 05   syscall
    1f93:       31 c0   xorl    %eax, %eax
    1f95:       5d      popq    %rbp
    1f96:       c3      retq

% ./hello
Hello, World!

% otool -L hello  
hello:
%