[ Not a but, strictly speaking, but just do not know, where else to ask. ]
Hello!
I like AT&T syntax of amd64 assembler, so I am using GNU As.
Unfortunately, it creates binries much bigger then one would expect from
source code. For compraison, trivial program, that just exits with
value 1 (essentially, /bin/false), implemented in fasm:
;; a02.fasm
format ELF64 executable at 0000000100000000h
segment readable executable
entry $
xor edi,edi
inc edi
mov eax,60
syscall
complied in following way
$ fasm a02.fasm
flat assembler version 1.73.06 (16384 kilobytes memory)
1 passes, 131 bytes.
results in tiny binary.
Equivalent program, compiled and linked with binutils
# a01.S
.globl _start
_start:
xor %di, %di
inc %di
mov $60, %eax
syscall
with following commands:
as a01.S -o a01.o
ld a01.o
results in huge binary:
$ du -hb a.out
4744 a.out
$ strip -s a.out
$ du -hb a.out
4408 a.out
$ file a.out
a.out: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically
linked, stripped
Both `as` and `ld` are from Debian package `binutils=2.31.1-11`. What
am I doing wrong? Can I force binutils to create small, ~150 bytes
binary?
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