llvm-extract - extract a function from an LLVM module
llvm-extract [options] --func function-name [filename]
The llvm-extract command takes the name of a function and extracts it
from the specified LLVM bitcode file. It is primarily used as a
debugging tool to reduce test cases from larger programs that are
triggering a bug.
In addition to extracting the bitcode of the specified function, llvm-
extract will also remove unreachable global variables, prototypes, and
The llvm-extract command reads its input from standard input if
filename is omitted or if filename is -. The output is always written
to standard output, unless the -o option is specified (see below).
-f Enable binary output on terminals. Normally, llvm-extract will
refuse to write raw bitcode output if the output stream is a
terminal. With this option, llvm-extract will write raw bitcode
regardless of the output device.
Extract the function named function-name from the LLVM bitcode. May
be specified multiple times to extract multiple functions at once.
Extract the global variable named global-name from the LLVM
bitcode. May be specified multiple times to extract multiple global
variables at once.
Print a summary of command line options.
Specify the output filename. If filename is "-" (the default),
then llvm-extract sends its output to standard output.
-S Write output in LLVM intermediate language (instead of bitcode).
If llvm-extract succeeds, it will exit with 0. Otherwise, if an error
occurs, it will exit with a non-zero value.
Maintained by the LLVM Team (<http://llvm.org>).