[Bug target/67215] -fno-plt needs improvements for x86

["andrew.n.senkevich at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67215

--- Comment #2 from Andrew Senkevich <andrew.n.senkevich at gmail dot com> ---
-bash-4.2$ cat test.c
extern int proc2(int);

int proc( void)
{
  int i = proc2( 3);

  return i;
}

gcc test.c -S -pie -fpie -o test.1.S
gcc test.c -S -pie -fpie -fno-plt -o test.2.S

-bash-4.2$ cat test.1.S
        .file   "test.c"
        .text
        .globl  proc
        .type   proc, @function
proc:
.LFB0:
        .cfi_startproc
        pushq   %rbp
        .cfi_def_cfa_offset 16
        .cfi_offset 6, -16
        movq    %rsp, %rbp
        .cfi_def_cfa_register 6
        subq    $16, %rsp
        movl    $3, %edi
        call    proc2@PLT
        movl    %eax, -4(%rbp)
        movl    -4(%rbp), %eax
        leave
        .cfi_def_cfa 7, 8
        ret
        .cfi_endproc
.LFE0:
        .size   proc, .-proc
        .ident  "GCC: (GNU) 6.0.0 20150812 (experimental)"
        .section        .note.GNU-stack,"",@progbits

-bash-4.2$ cat test.2.S
        .file   "test.c"
        .text
        .globl  proc
        .type   proc, @function
proc:
.LFB0:
        .cfi_startproc
        pushq   %rbp
        .cfi_def_cfa_offset 16
        .cfi_offset 6, -16
        movq    %rsp, %rbp
        .cfi_def_cfa_register 6
        subq    $16, %rsp
        movq    proc2@GOTPCREL(%rip), %rax
        movl    $3, %edi
        call    *%rax
        movl    %eax, -4(%rbp)
        movl    -4(%rbp), %eax
        leave
        .cfi_def_cfa 7, 8
        ret
        .cfi_endproc
.LFE0:
        .size   proc, .-proc
        .ident  "GCC: (GNU) 6.0.0 20150812 (experimental)"
        .section        .note.GNU-stack,"",@progbits