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authorDenys Vlasenko <vda.linux@googlemail.com>2009-11-26 04:25:24 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2009-11-26 04:25:24 (GMT)
commitfa1e7177fbd442f15e31cf96113b582753764de7 (patch)
tree71034a6be4a50fbe63a6a5421223c5c4f337c3ec
parentb2e5fc35ebc127e2a1ac03c7ff0719b1e6b6cd6b (diff)
downloadbusybox-fa1e7177fbd442f15e31cf96113b582753764de7.tar.gz
busybox-fa1e7177fbd442f15e31cf96113b582753764de7.tar.bz2
build system: fix for coarse mtime problem
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--scripts/kconfig/Makefile23
1 files changed, 23 insertions, 0 deletions
diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index f56863f..b5708e2 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -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: