[LLVMbugs] [Bug 14250] New: incorrect -Wunneeded-internal-declaration warning with weak symbols

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14250

             Bug #: 14250
           Summary: incorrect -Wunneeded-internal-declaration warning with
                    weak symbols
           Product: clang
           Version: 3.1
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: bonzini at gnu.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


This file:

static int g()
{
    return 42;
}
typeof(g) f __attribute__((__weak__, __alias__("g")));

compiled with -Wall gives:

g2.c:3:12: warning: function 'g' is not needed and will not be emitted
      [-Wunneeded-internal-declaration]

even though the function is emitted:

    .file    "g2.c"
    .text
    .align    16, 0x90
    .type    g, at function
g:                                      # @g
    .cfi_startproc
# BB#0:
    movl    $42, %eax
    ret
.Ltmp0:
    .size    g, .Ltmp0-g
    .cfi_endproc


    .weak    f
f = g
    .section    ".note.GNU-stack","", at progbits

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