[LLVMbugs] [Bug 11116] New: Weak aliases are not supported on MacOS X

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Oct 12 02:15:28 PDT 2011


           Summary: Weak aliases are not supported on MacOS X
           Product: clang
           Version: trunk
          Platform: Macintosh
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: llvm at martin-whitaker.me.uk
                CC: llvmbugs at cs.uiuc.edu

When compiling the following (simplified) code fragment:

  int get_value(int *value)
    return *value;

  int get_value_alias(int *high) __attribute__ ((weak, alias ("get_value")));

for MacOS X, clang reports the following error:

  % clang -ccc-host-triple i386-apple-darwin -c -o bug.o bug.c
  bug.c:6:54: error: only weak aliases are supported on darwin
  int get_value_alias(int *high) __attribute__ ((weak, alias ("get_value"))); 

It would appear that clang does not support weak aliases on MacOS X (I asked on
the cfe-dev list, but nobody suggested a solution). If it is not possible to
support weak aliases for this target, I suggest changing the error message to
indicate this fact.

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