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build: clean the package root dir only if the packages can have changed

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The stamp of package/cleanup depends on tmp/.build, which is touched on
every make call, so every build deletes $(STAGING_DIR_ROOT) and every
package copies its files into it again, one after the other under a
lock. With all packages selected, this takes 5 s of a build that has
nothing to do, most of it in the 1102 kmods of package/kernel/linux.

Only clean it if .config, the package metadata or a file below package/
changed since the last cleanup. An edit of the source in a build
directory alone does not clean it, so a file that such an edit removes
from a package stays until then. make package/cleanup cleans it at any
time.

Signed-off-by: John Crispin <john@phrozen.org>
This commit is contained in:
John Crispin committed 2026-09-22 18:18:58 +02:00
1 parent e7d105af30
commit bc2e85eb8d
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package/Makefile
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@@ -188,7 +188,7 @@ endif
$(curdir)/flags-install:= -j1
$(eval $(call stampfile,$(curdir),package,prereq,.config))
$(eval $(call stampfile,$(curdir),package,cleanup,$(TMP_DIR)/.build))
$(eval $(call stampfile,$(curdir),package,cleanup,.config $(TMP_DIR)/.packageinfo))
$(eval $(call stampfile,$(curdir),package,compile,$(TMP_DIR)/.build))
$(eval $(call stampfile,$(curdir),package,install,$(TMP_DIR)/.build))
$(eval $(call stampfile,$(curdir),package,check,$(TMP_DIR)/.build))