[LLVMbugs] [Bug 18250] New: Please implement the option -u

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18250

            Bug ID: 18250
           Summary: Please implement the option -u
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Driver
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sylvestre at debian.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The option '-u' exists in gcc and is not implemented in clang.

Here is the information about it:
-u symbol
    Pretend the symbol symbol is undefined, to force linking of library modules
to define it. You can use -u multiple times with different symbols to force
loading of additional library modules. 

In the effort to rebuild Debian, it causes more than 600 build failure (mostly
haskell packages):
http://clang.debian.net/status.php?version=3.3&key=UNDEF_REF

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