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-rw-r--r--mk/buildsystem.mk1
1 files changed, 1 insertions, 0 deletions
diff --git a/mk/buildsystem.mk b/mk/buildsystem.mk
index 7050489..0ab3eb2 100644
--- a/mk/buildsystem.mk
+++ b/mk/buildsystem.mk
@@ -73,6 +73,7 @@ embtk_kconfig_basic:
clean: toolchain_clean rmallpath
$(Q)$(__embtk_kconfig_clean)
+ [ -e .config ] && cp .config .config.old
$(Q)rm -rf .config kbuild.log .fakeroot*
$(Q)rm -rf $(wildcard $(embtk_generated)/toolchain-*/.*.embtk.decompressed)