[LLVMbugs] [Bug 12356] New: junk appended to extern aliased variable name

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12356

             Bug #: 12356
           Summary: junk appended to extern aliased variable name
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: OpenBSD
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: Static Analyzer
        AssignedTo: kremenek at apple.com
        ReportedBy: marco at peereboom.us
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 8268
  --> http://llvm.org/bugs/attachment.cgi?id=8268
Example code

When compiling the following code:

long __guard[8] = {0, 0, 0, 0, 0, 0, 0, 0};
extern long __stack_chk_guard[8] __attribute__((alias("__guard")));

The __stack_chk_guard alias has an Undefined __stack_chk_guard3 symbol added to
the .o

nm output:
$ nm libtest.so | grep stack_chk_guard
00401220 B __stack_chk_guard
         U __stack_chk_guard3
$ clang -v
clang version 3.1 
Target: amd64-unknown-openbsd5.1
Thread model: posix



This works correctly with clang 3.0 and gcc 4.6
$ nm libtest.so | grep stack_chk_guard 
004012e0 B __stack_chk_guard
$ clang -v
clang version 3.0 (tags/RELEASE_30/final)
Target: amd64-unknown-openbsd5.1
Thread model: posix


See the attached tgz for the example code.

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