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· 3 min read

gcc error when inline without static​

inline only​

C code:​

#include <stdio.h>

inline int func() { printf("dll\n"); }

int main() { func(); }

asm code:​

  .section  __TEXT,__text,regular,pure_instructions
  .build_version macos, 11, 0   sdk_version 11, 1
  .globl    _main                   ## -- Begin function main
  .p2align  4, 0x90
_main:                                  ## @main
  .cfi_startproc
## %bb.0:
  pushq %rbp
  .cfi_def_cfa_offset 16
  .cfi_offset %rbp, -16
  movq  %rsp, %rbp
  .cfi_def_cfa_register %rbp
  subq  $16, %rsp
  callq _func
  xorl  %ecx, %ecx
  movl  %eax, -4(%rbp)          ## 4-byte Spill
  movl  %ecx, %eax
  addq  $16, %rsp
  popq  %rbp
  retq
  .cfi_endproc
                                        ## -- End function
.subsections_via_symbols

With static​

C code​

#include <stdio.h>

static inline int func() { printf("dll\n"); }

int main() { func(); }

asm code​

  .section  __TEXT,__text,regular,pure_instructions
  .build_version macos, 11, 0   sdk_version 11, 1
  .globl    _main                   ## -- Begin function main
  .p2align  4, 0x90
_main:                                  ## @main
  .cfi_startproc
## %bb.0:
  pushq %rbp
  .cfi_def_cfa_offset 16
  .cfi_offset %rbp, -16
  movq  %rsp, %rbp
  .cfi_def_cfa_register %rbp
  subq  $16, %rsp
  callq _func
  xorl  %ecx, %ecx
  movl  %eax, -4(%rbp)          ## 4-byte Spill
  movl  %ecx, %eax
  addq  $16, %rsp
  popq  %rbp
  retq
  .cfi_endproc
                                        ## -- End function
  .p2align  4, 0x90         ## -- Begin function func
_func:                                  ## @func
  .cfi_startproc
## %bb.0:
  pushq %rbp
  .cfi_def_cfa_offset 16
  .cfi_offset %rbp, -16
  movq  %rsp, %rbp
  .cfi_def_cfa_register %rbp
  subq  $16, %rsp
  leaq  L_.str(%rip), %rdi
  movb  $0, %al
  callq _printf
  movl  -4(%rbp), %ecx
  movl  %eax, -8(%rbp)          ## 4-byte Spill
  movl  %ecx, %eax
  addq  $16, %rsp
  popq  %rbp
  retq
  .cfi_endproc
                                        ## -- End function
  .section  __TEXT,__cstring,cstring_literals
L_.str:                                 ## @.str
  .asciz    "dll\n"

.subsections_via_symbols

With __attribute__​

C code​

#include <stdio.h>

#define inline __attribute__((alwyas_inline))

inline int func() { printf("dll\n"); }

int main() { func(); }

asm code​

  .section  __TEXT,__text,regular,pure_instructions
  .build_version macos, 11, 0   sdk_version 11, 1
  .globl    _func                   ## -- Begin function func
  .p2align  4, 0x90
_func:                                  ## @func
  .cfi_startproc
## %bb.0:
  pushq %rbp
  .cfi_def_cfa_offset 16
  .cfi_offset %rbp, -16
  movq  %rsp, %rbp
  .cfi_def_cfa_register %rbp
  subq  $16, %rsp
  leaq  L_.str(%rip), %rdi
  movb  $0, %al
  callq _printf
  movl  -4(%rbp), %ecx
  movl  %eax, -8(%rbp)          ## 4-byte Spill
  movl  %ecx, %eax
  addq  $16, %rsp
  popq  %rbp
  retq
  .cfi_endproc
                                        ## -- End function
  .globl    _main                   ## -- Begin function main
  .p2align  4, 0x90
_main:                                  ## @main
  .cfi_startproc
## %bb.0:
  pushq %rbp
  .cfi_def_cfa_offset 16
  .cfi_offset %rbp, -16
  movq  %rsp, %rbp
  .cfi_def_cfa_register %rbp
  subq  $16, %rsp
  callq _func
  xorl  %ecx, %ecx
  movl  %eax, -4(%rbp)          ## 4-byte Spill
  movl  %ecx, %eax
  addq  $16, %rsp
  popq  %rbp
  retq
  .cfi_endproc
                                        ## -- End function
  .section  __TEXT,__cstring,cstring_literals
L_.str:                                 ## @.str
  .asciz    "dll\n"

.subsections_via_symbols