37432a83fa
commit 8dfb61dcba upstream.
Allow user to use alternative implementations of compression tools,
such as pigz, pbzip2, pxz. For example, multi-threaded tools to
speed up the build:
$ make GZIP=pigz BZIP2=pbzip2
Variables _GZIP, _BZIP2, _LZOP are used internally because original env
vars are reserved by the tools. The use of GZIP in gzip tool is obsolete
since 2015. However, alternative implementations (e.g., pigz) still rely
on it. BZIP2, BZIP, LZOP vars are not obsolescent.
The credit goes to @grsecurity.
As a sidenote, for multi-threaded lzma, xz compression one can use:
$ export XZ_OPT="--threads=0"
Signed-off-by: Denis Efremov <efremov@linux.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Matthias Maennich <maennich@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
24 lines
563 B
Bash
Executable File
24 lines
563 B
Bash
Executable File
#!/bin/sh
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#
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# This is a wrapper for xz to compress the kernel image using appropriate
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# compression options depending on the architecture.
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#
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# Author: Lasse Collin <lasse.collin@tukaani.org>
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#
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# This file has been put into the public domain.
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# You can do whatever you want with this file.
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#
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BCJ=
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LZMA2OPTS=
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case $SRCARCH in
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x86) BCJ=--x86 ;;
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powerpc) BCJ=--powerpc ;;
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ia64) BCJ=--ia64; LZMA2OPTS=pb=4 ;;
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arm) BCJ=--arm ;;
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sparc) BCJ=--sparc ;;
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esac
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exec $XZ --check=crc32 $BCJ --lzma2=$LZMA2OPTS,dict=32MiB
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