fa1e7177f
Denys Vlasenko
2009-11-26
Subject
build system: fix for coarse mtime problem
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scripts/kconfig/Makefile+23 -0
| @@ -17,11 +17,28 @@ menuconfig: $(obj)/mconf | |
| config: $(obj)/conf | |
| $< Config.in | |
| + | # Mtime granularity problem. |
| + | # It was observed that these commands: |
| + | # make allnoconfig; sed -i -e '/CONFIG_TRUE/s/.*/CONFIG_TRUE=y/' .config; make |
| + | # sometimes produce busybox with "true" applet still disabled. |
| + | # This is caused by .config updated by sed having mtime which is still |
| + | # equal to (not bigger than) include/autoconf.h's mtime, |
| + | # and thus 2nd make does not regenerate include/autoconf.h. |
| + | # Waiting for 1 second after non-interactive "make XXXXconfig" |
| + | # prevents this from happening. |
| + | # |
| + | # We'd like to detect whether filesystem we are on has coarse mtimes, |
| + | # but can't do it yet, bbox ls hasn't got --full-time. |
| + | #MTIME_IS_COARSE:=@ls --full-time -ld | grep -F .000 >/dev/null |
| + | MTIME_IS_COARSE:=@true |
| + | |
| oldconfig: $(obj)/conf | |
| $< -o Config.in | |
| + | $(MTIME_IS_COARSE) && sleep 1 |
| silentoldconfig: $(obj)/conf | |
| $< -s Config.in | |
| + | $(MTIME_IS_COARSE) && sleep 1 |
| update-po-config: $(obj)/kxgettext | |
| xgettext --default-domain=linux \ | |
| @@ -46,15 +63,19 @@ PHONY += randconfig allyesconfig allnoconfig allmodconfig defconfig | |
| randconfig: $(obj)/conf | |
| $< -r Config.in | |
| + | $(MTIME_IS_COARSE) && sleep 1 |
| allyesconfig: $(obj)/conf | |
| $< -y Config.in | |
| + | $(MTIME_IS_COARSE) && sleep 1 |
| allnoconfig: $(obj)/conf | |
| $< -n Config.in | |
| + | $(MTIME_IS_COARSE) && sleep 1 |
| allmodconfig: $(obj)/conf | |
| $< -m Config.in | |
| + | $(MTIME_IS_COARSE) && sleep 1 |
| defconfig: $(obj)/conf | |
| ifeq ($(KBUILD_DEFCONFIG),) | |
| @@ -63,9 +84,11 @@ else | |
| @echo *** Default configuration is based on '$(KBUILD_DEFCONFIG)' | |
| $(Q)$< -D $(KBUILD_DEFCONFIG) Config.in | |
| endif | |
| + | $(MTIME_IS_COARSE) && sleep 1 |
| %_defconfig: $(obj)/conf | |
| $(Q)$< -D $@ Config.in | |
| + | $(MTIME_IS_COARSE) && sleep 1 |
| # Help text used by make help | |
| help: | |