.\" Copyright (c) 2011 Joseph Koshy.  All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" THIS SOFTWARE IS PROVIDED BY JOSEPH KOSHY ``AS IS'' AND
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL JOSEPH KOSHY BE LIABLE
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" $Id: strip.1 3642 2018-10-14 14:24:28Z jkoshy $
.\"
.Dd July 27, 2019
.Dt STRIP 1
.Os
.Sh NAME
.Nm strip
.Nd discard information from ELF objects
.Sh SYNOPSIS
.Nm
.Op Fl d | Fl g | Fl S | Fl -strip-debug
.Op Fl h | Fl -help
.Op Fl -only-keep-debug
.Op Fl o Ar outputfile | Fl -output-file= Ns Ar outputfile
.Op Fl p | Fl -preserve-dates
.Op Fl s | Fl -strip-all
.Op Fl -strip-unneeded
.Op Fl w | Fl -wildcard
.Op Fl x | Fl -discard-all
.Op Fl I Ar format | Fl -input-target= Ns Ar format
.Op Fl K Ar symbol | Fl -keep-symbol= Ns Ar symbol
.Op Fl N Ar symbol | Fl -strip-symbol= Ns Ar symbol
.Op Fl O Ar format | Fl -output-target= Ns Ar format
.Op Fl R Ar sectionname | Fl -remove-section= Ns Ar sectionname
.Op Fl V | Fl -version
.Op Fl X | Fl -discard-locals
.Ar
.Sh DESCRIPTION
The
.Nm
utility is used to discard information from the ELF objects
specified by the arguments
.Ar .
.Pp
If an explicit output file name is not specified using the
.Fl o
option, the
.Nm
utility will modify its input arguments in-place.
.Pp
The
.Nm
utility supports the following options:
.Bl -tag -width indent
.It Fl d | Fl g | Fl S | Fl -strip-debug
Remove debugging symbols only.
.It Fl h | Fl -help
Print a help message and exit.
.It Fl -only-keep-debug
Remove all content except that which would be used for debugging.
.It Fl o Ar outputfile | Fl -output-file= Ns Ar outputfile
Write the stripped object to file
.Ar outputfile
instead of modifying the input in-place.
Only a single input object should be specified if this option is used.
.It Fl p | Fl -preserve-dates
Preserve the object's access and modification times.
.It Fl s | Fl -strip-all
Remove all symbols.
.It Fl -strip-unneeded
Remove all symbols not needed for further relocation processing.
.It Fl w | Fl -wildcard
Use shell-style patterns to name symbols.
The following meta-characters are recognized in patterns:
.Bl -tag -width "...." -compact
.It Li !
If this is the first character of the pattern, invert the sense of the
pattern match.
.It Li *
Matches any string of characters in a symbol name.
.It Li ?
Matches zero or one character in a symbol name.
.It Li [
Mark the start of a character class.
.It Li \e
Remove the special meaning of the next character in the pattern.
.It Li ]
Mark the end of a character class.
.El
.It Fl x | Fl -discard-all
Discard all non-global symbols.
.It Fl I Ar format | Fl -input-target= Ns Ar format
These options are accepted, but are ignored.
.It Fl K Ar symbol | Fl -keep-symbol= Ns Ar symbol
Keep the symbol
.Ar symbol
even if it would otherwise be stripped.
This option may be specified multiple times.
.It Fl N Ar symbol | Fl -strip-symbol= Ns Ar symbol
Remove the symbol
.Ar symbol
even if it would otherwise have been kept.
This option may be specified multiple times.
.It Fl O Ar format | Fl -output-target= Ns Ar format
Set the output file format to
.Ar format .
For the full list of supported formats, please see the documentation
for function
.Xr elftc_bfd_find_target 3 .
.It Fl R Ar sectionname | Fl -remove-section= Ns Ar sectionname
Remove the section named by the argument
.Ar sectionname .
This option may be specified multiple times.
.It Fl V | Fl -version
Print a version identifier and exit.
.It Fl X | Fl -discard-locals
Remove compiler-generated local symbols.
.El
.Sh DIAGNOSTICS
.Ex -std
.Sh SEE ALSO
.Xr ar 1 ,
.Xr elfcopy 1 ,
.Xr ld 1 ,
.Xr mcs 1 ,
.Xr elf 3 ,
.Xr elftc_bfd_find_target 3 ,
.Xr fnmatch 3