1LLVM-DWARFUTIL(1)                    LLVM                    LLVM-DWARFUTIL(1)
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NAME

6       llvm-dwarfutil - A tool to copy and manipulate debug info
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SYNOPSIS

9       llvm-dwarfutil [options] input output
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DESCRIPTION

12       llvm-dwarfutil is a tool to copy and manipulate debug info.
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14       In basic usage, it makes a semantic copy of the input to the output. If
15       any options are specified, the output may be modified  along  the  way,
16       e.g.  by removing unused debug info.
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18       If "-" is specified for the input file, the input is read from the pro‐
19       gram's standard input stream. If "-" is specified for the output  file,
20       the output is written to the standard output stream of the program.
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22       The tool is still in active development.
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COMMAND-LINE OPTIONS

25       --garbage-collection
26              Removes  pieces  of  debug information related to discarded sec‐
27              tions.  When the linker  does  section  garbage  collection  the
28              abandoned  debug  info is left behind. Such abandoned debug info
29              references address ranges using  tombstone  values.  Thus,  when
30              this  option  is specified, the tool removes debug info which is
31              marked with the tombstone value.
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33              That option is enabled by default.
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35       --odr-deduplication
36              Remove duplicated types (if "One Definition Rule"  is  supported
37              by  source  language).  Keeps  first type definition and removes
38              other definitions, potentially significantly reducing  the  size
39              of output debug info.
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41              That option is enabled by default.
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43       --help, -h
44              Print a summary of command line options.
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46       --no-garbage-collection
47              Disable --garbage-collection.
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49       --no-odr-deduplication
50              Disable --odr-deduplication.
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52       --no-separate-debug-file
53              Disable --separate-debug-file.
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55       --num-threads=<n>, -j
56              Specifies  the maximum number (n) of simultaneous threads to use
57              for processing.
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59       --separate-debug-file
60              Generate separate  file  containing  output  debug  info.  Using
61              llvm-dwarfutil  with  that option equals to the following set of
62              commands:
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64          :program:`llvm-objcopy` --only-keep-debug in-file out-file.debug
65          :program:`llvm-objcopy` --strip-debug in-file out-file
66          :program:`llvm-objcopy` --add-gnu-debuglink=out-file.debug out-file
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68       --tombstone=<value>
69              <value> can be one of the following values:
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71                 • bfd: zero for all addresses and  [1,1]  for  DWARF  v4  (or
72                   less) address ranges and exec.
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74                 • maxpc:  -1  for all addresses and -2 for DWARF v4 (or less)
75                   address ranges.
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77                 • universal: both bfd and maxpc.
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79                 • exec: match with address ranges of executable sections.
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81                 The value universal is used by default.
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83       --verbose
84              Enable verbose logging. This option disables multi-thread mode.
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86       --verify
87              Run the DWARF verifier on the output DWARF debug info.
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89       --version
90              Print the version of this program.
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SUPPORTED FORMATS

93       The following formats are currently supported by llvm-dwarfutil:
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95       ELF
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EXIT STATUS

98       llvm-dwarfutil exits with a non-zero exit code if there  is  an  error.
99       Otherwise, it exits with code 0.
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BUGS

102       To         report         bugs,         please         visit         <‐
103       https://github.com/llvm/llvm-project/labels/tools:llvm-dwarfutil/>.
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AUTHOR

106       Maintained by the LLVM Team (https://llvm.org/).
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109       2003-2023, LLVM Project
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11415                                2023-01-12                 LLVM-DWARFUTIL(1)
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