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kernel: prevent unnecessary rebuilding due to config_data.gz 

When IKCONFIG is built-in make oldconfig will cause the kernel to be
relinked even if .config didn't change. This happens because of a
config_data.gz dependency on .config. This patch changes the if_changed
to a filechk so that config_data.h is only rebuilt when the contents
have actually changed.

Signed-off-by: Peter Foley <pefoley2@verizon.net>
Signed-off-by: Michal Marek <mmarek@suse.cz>
This commit is contained in:
Peter Foley 2011-07-05 19:42:18 -04:00 committed by Michal Marek
parent f210735fe2
commit e78e8f2d83
1 changed files with 2 additions and 3 deletions
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5
kernel/Makefile
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@ -125,11 +125,10 @@ targets += config_data.gz
$(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE
$(call if_changed,gzip)
quiet_cmd_ikconfiggz = IKCFG $@
cmd_ikconfiggz = (echo "static const char kernel_config_data[] __used = MAGIC_START"; cat $< | scripts/bin2c; echo "MAGIC_END;") > $@
filechk_ikconfiggz = (echo "static const char kernel_config_data[] __used = MAGIC_START"; cat $< | scripts/bin2c; echo "MAGIC_END;")
targets += config_data.h
$(obj)/config_data.h: $(obj)/config_data.gz FORCE
$(call if_changed,ikconfiggz)
$(call filechk,ikconfiggz)
$(obj)/time.o: $(obj)/timeconst.h