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kbuild: allow compressors (gzip, bzip2, lzma) to take multiple inputs

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Allow the compression commands in Kbuild (i.e. gzip, bzip2, lzma) to
take multiple input files and emit the concatenated compressed
output.  This avoids an intermediate step when a kernel image is built
from multiple components, such as the relocatable x86-32 kernel.

Sam Ravnborg integrated the bin_size script into the Makefile.

[ Impact: new build feature, not yet used ]

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
H. Peter Anvin 2009-05-05 21:17:15 -07:00
parent 0b4eb462da
commit d3dd3b5a29
2 changed files with 20 additions and 16 deletions
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26
scripts/Makefile.lib
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@ -183,20 +183,34 @@ cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
# ---------------------------------------------------------------------------
quiet_cmd_gzip = GZIP $@
cmd_gzip = gzip -f -9 < $< > $@
cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -f -9 > $@) || \
(rm -f $@ ; false)
# Bzip2
# ---------------------------------------------------------------------------
# Bzip2 does not include size in file... so we have to fake that
size_append=$(CONFIG_SHELL) $(srctree)/scripts/bin_size
# Bzip2 and LZMA do not include size in file... so we have to fake that;
# append the size as a 32-bit littleendian number as gzip does.
size_append = echo -ne $(shell \
dec_size=0; \
for F in $1; do \
fsize=$$(stat -c "%s" $$F); \
dec_size=$$(expr $$dec_size + $$fsize); \
done; \
printf "%08x" $$dec_size | \
sed 's/\(..\)\(..\)\(..\)\(..\)/\\\\x\4\\\\x\3\\\\x\2\\\\x\1/g' \
)
quiet_cmd_bzip2 = BZIP2 $@
cmd_bzip2 = (bzip2 -9 < $< && $(size_append) $<) > $@ || (rm -f $@ ; false)
quiet_cmd_bzip2 = BZIP2 $@
cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
(rm -f $@ ; false)
# Lzma
# ---------------------------------------------------------------------------
quiet_cmd_lzma = LZMA $@
cmd_lzma = (lzma -9 -c $< && $(size_append) $<) >$@ || (rm -f $@ ; false)
cmd_lzma = (cat $(filter-out FORCE,$^) | \
lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
(rm -f $@ ; false)

10
scripts/bin_size
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@ -1,10 +0,0 @@
#!/bin/sh
if [ $# = 0 ] ; then
echo Usage: $0 file
fi
size_dec=`stat -c "%s" $1`
size_hex_echo_string=`printf "%08x" $size_dec |
sed 's/\(..\)\(..\)\(..\)\(..\)/\\\\x\4\\\\x\3\\\\x\2\\\\x\1/g'`
/bin/echo -ne $size_hex_echo_string