[LLVMbugs] [Bug 20129] opt and llc hang trying to parse unspecified string options

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20129

Reid Kleckner <rnk at google.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |rnk at google.com
         Resolution|---                         |WORKSFORME

--- Comment #1 from Reid Kleckner <rnk at google.com> ---
opt and llc are designed, like most unix tools, to accept input from stdin if
you don't specify an input file.  Both of these options consume a value, and in
this case test.ll is consumed by the option.

Clang's -mllvm is an escaping mechanism, it doesn't know anything about the
structure of LLVM options.  You have to use it like so:

$ clang -mllvm -extract-blocks-file -mllvm test.ll
clang.exe: error: no input files

In your clang command line, LLVM's option parsing is seeing the command line
'-extract-blocks-file', and expecting a value where there is none.

Does that answer your question?

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