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kbuild: add variables for compression tools

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commit 8dfb61dcbaceb19a5ded5e9c9dcf8d05acc32294 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 The use of GZIP in gzip tool is obsolete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>
This commit is contained in:
Denis Efremov 2020-06-05 10:39:55 +03:00 • committed by Greg Kroah-Hartman
commit 37432a83fa
10 changed files with 45 additions and 24 deletions
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8
scripts/Makefile.package
View file

@ -45,7 +45,7 @@ if test "$(objtree)" != "$(srctree)"; then \
false; \
fi ; \
$(srctree)/scripts/setlocalversion --save-scmversion; \
tar -cz $(RCS_TAR_IGNORE) -f $(2).tar.gz \
tar -I $(_GZIP) -c $(RCS_TAR_IGNORE) -f $(2).tar.gz \
--transform 's:^:$(2)/:S' $(TAR_CONTENT) $(3); \
rm -f $(objtree)/.scmversion
@ -127,9 +127,9 @@ util/PERF-VERSION-GEN $(CURDIR)/$(perf-tar)/); \
tar rf $(perf-tar).tar $(perf-tar)/HEAD $(perf-tar)/PERF-VERSION-FILE; \
rm -r $(perf-tar); \
$(if $(findstring tar-src,$@),, \
$(if $(findstring bz2,$@),bzip2, \
$(if $(findstring gz,$@),gzip, \
$(if $(findstring xz,$@),xz, \
$(if $(findstring bz2,$@),$(_BZIP2), \
$(if $(findstring gz,$@),$(_GZIP), \
$(if $(findstring xz,$@),$(XZ), \
$(error unknown target $@)))) \
-f -9 $(perf-tar).tar)