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20 Chapter 4. objcopy

-add-gnu-debuglink=path-to-file

Creates a .gnu_debuglink section which contains a reference to path-to-file and adds it to

the output ﬁle.

-only-keep-debug

Strip a ﬁle, removing any sections that would be stripped by -strip-debug and leaving the

debugging sections.

The intention is that this option will be used in conjunction with -add-gnu-debuglink to

create a two part executable. One a stripped binary which will occupy less space in RAM and

in a distribution and the second a debugging information ﬁle which is only needed if debugging

abilities are required. The suggested procedure to create these ﬁles is as follows:

1. Link the executable as normal. Assuming that is is called foo then...

2. Run objcopy -only-keep-debug foo foo.d/jointfilesconvert/411015/bg to create a ﬁle containing the debug-

ging info.

3. Run objcopy -strip-debug foo to create a stripped executable.

4. Run objcopy -add-gnu-debuglink=foo.d/jointfilesconvert/411015/bg foo to add a link to the debugging info

into the stripped executable.

Note - the choice of .d/jointfilesconvert/411015/bg as an extension for the debug info ﬁle is arbitrary. Also the

-only-keep-debug step is optional. You could instead do this:

1. Link the executable as normal.

2. Copy foo to foo.full

3. Run objcopy -strip-debug foo

4. Run objcopy -add-gnu-debuglink=foo.full foo

ie the ﬁle pointed to by the -add-gnu-debuglink can be the full executable. It does not have

to be a ﬁle created by the -only-keep-debug switch.

-V

-version

Show the version number of objcopy.

-v

-verbose

Verbose output: list all object ﬁles modiﬁed. In the case of archives, objcopy -V lists all mem-

bers of the archive.

-help

Show a summary of the options to objcopy.

-info

Display a list showing all architectures and object formats available.

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Red Hat ENTERPRISE LINUX 4 - USING BINUTILS Manuale Utente Pagina 26