Added information regarding additional LLVM passes used, input defaults, and
output defaults.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8802
91177308-0d34-0410-b5e6-
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SYNOPSIS
</h3>
-extract [options] <filename> [filename ...]
+extract [options] [filename]
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DESCRIPTION
</h3>
The extract command takes the name of a function and extracts it from the
specified LLVM bytecode file. It is primarily used as a debugging tool to
reduce test cases from larger programs that are triggering a bug.
+<p>
+
+In addition to extracting the bytecode of the specified function, extract will
+also remove unreachable global variables, prototypes, and unused types.
+<p>
+
+The extract command will read its input from standard input if filename is
+omitted or if filename is -. The output is always written to standard output.
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OPTIONS