[Bug middle-end/36282] [4.7/4.8/4.9 Regression] Spurious warning "asm declaration ignored due to conflict with previous rename"

[aldot at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36282

Bernhard Reutner-Fischer <aldot at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |3.4.6
            Summary|Spurious warning "asm       |[4.7/4.8/4.9 Regression]
                   |declaration ignored due to  |Spurious warning "asm
                   |conflict with previous      |declaration ignored due to
                   |rename"                     |conflict with previous
                   |                            |rename"
      Known to fail|                            |4.7.2, 4.8.0

--- Comment #5 from Bernhard Reutner-Fischer <aldot at gcc dot gnu.org> 2013-03-22 13:06:47 UTC ---
$ gcc-3.4 -fno-exceptions -fomit-frame-pointer -fno-builtin -S pr36282.c -o
ok.s
$ gcc-4.7 -fno-exceptions -fomit-frame-pointer -fno-builtin -S pr36282.c -o
nak.s
pr36282.c:3:1: warning: asm declaration ignored due to conflict with previous
rename [-Wpragmas]

$ cat pr36282.c 
#pragma weak __pthread_initialize
extern void *memcpy(void *dest, const void *src, int n);
extern typeof(memcpy) memcpy asm("__GI_memcpy");
char *usr(void) {
    char ch[2];
    return memcpy(&ch, "x", 2);
}
$ cat ok.s
    .file    "pr36282.c"
    .section    .rodata
.LC0:
    .string    "x"
    .text
.globl usr
    .type    usr, @function
usr:
.LFB2:
    subq    $24, %rsp
.LCFI0:
    movq    %rsp, %rdi
    movl    $2, %edx
    movl    $.LC0, %esi
    call    __GI_memcpy
    addq    $24, %rsp
    ret
.LFE2:
    .size    usr, .-usr
    .section    .eh_frame,"a",@progbits
.Lframe1:
    .long    .LECIE1-.LSCIE1
.LSCIE1:
    .long    0x0
    .byte    0x1
    .string    ""
    .uleb128 0x1
    .sleb128 -8
    .byte    0x10
    .byte    0xc
    .uleb128 0x7
    .uleb128 0x8
    .byte    0x90
    .uleb128 0x1
    .align 8
.LECIE1:
.LSFDE1:
    .long    .LEFDE1-.LASFDE1
.LASFDE1:
    .long    .LASFDE1-.Lframe1
    .quad    .LFB2
    .quad    .LFE2-.LFB2
    .byte    0x4
    .long    .LCFI0-.LFB2
    .byte    0xe
    .uleb128 0x20
    .align 8
.LEFDE1:
    .section    .note.GNU-stack,"",@progbits
    .ident    "GCC: (GNU) 3.4.6 (Debian 3.4.6-10)"

$ cat nak.s
    .file    "pr36282.c"
    .section    .rodata
.LC0:
    .string    "x"
    .text
    .globl    usr
    .type    usr, @function
usr:
.LFB0:
    .cfi_startproc
    subq    $24, %rsp
    .cfi_def_cfa_offset 32
    movq    %rsp, %rax
    movl    $2, %edx
    movl    $.LC0, %esi
    movq    %rax, %rdi
    call    memcpy
    addq    $24, %rsp
    .cfi_def_cfa_offset 8
    ret
    .cfi_endproc
.LFE0:
    .size    usr, .-usr
    .ident    "GCC: (Debian 4.7.2-5) 4.7.2"
    .section    .note.GNU-stack,"",@progbits