[LLVMbugs] [Bug 8999] New: How to find out the target triple and target data of the host machine via C bindings?

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8999

           Summary: How to find out the target triple and target data of
                    the host machine via C bindings?
           Product: Documentation
           Version: 2.8
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: General docs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: llvm at henning-thielemann.de
                CC: llvmbugs at cs.uiuc.edu, llvm at henning-thielemann.de


Please describe how to find out the information needed to let the optimizer
work correct and adapted to the host machine when run via the C bindings to
LLVM. I'll attach a C program that creates a small function, that shall be run
in the JIT. As far as I understand, if I do not tell the target data to
PassManager, then I get only generic optimizations. If I set the target data to
something invalid (as in the outcommented AddTargetData) the optimizer even
performs silently optimizations that are invalid for the host machine. (See
http://llvm.org/bugs/show_bug.cgi?id=6394 for details.) Thus: How do I tell the
LLVM optimizer to optimize with respect to the host, where I like to run the
function in the JIT later?

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