[llvm-bugs] [Bug 27896] New: Create unique name for weak symbol on coff.

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27896

            Bug ID: 27896
           Summary: Create unique name for weak symbol on coff.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: MC
          Assignee: unassignedbugs at nondot.org
          Reporter: rafael.espindola at gmail.com
                CC: david.majnemer at gmail.com, llvm-bugs at lists.llvm.org,
                    rnk at google.com
    Classification: Unclassified

Given
---------------------------
        .data
        .weak   a
a:
        .long   42
---------------------------

MC always creates a .weak.a.default. That means that given any two files that
define a "weak" symbol "a", there will be a link error (duplicated
.weak.a.default).

With gas one gets slightly more unique names. It looks like it uses the
previous global. Given

--------------------------
.global foobar
        .data
        .weak   a
a:
        .long   42
-------------------------
it produces .weak.a.foobar and given

-------------------------
.global zed
        .data
        .weak   a
a:
        .long   42
-------------------------
it produces .weak.a.zed.

I don't think how we get a more unique name is particularly important, just
that  we do.

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