From 4f1127e204377cbd2a56d112d323466f668e8334 Mon Sep 17 00:00:00 2001 From: Sam Ravnborg Date: Wed, 26 Sep 2007 19:38:44 +0200 Subject: kbuild: fix infinite make recursion Jan Engelhardt reported: You can cause a recursion in kbuild/make with the following: make O=$PWD kernel/time.o make mrproper Of course no one would use O=$PWD (that's just the testcase), but this happened too often: /ws/linux/linux-2.6.23$ make O=/ws/linux/linux-2.6.23 kernel/time.o (Oops - should have been O=/ws/linux/obj-2.6.23!) Fixed by an explicit test for this case - we error out if output directory and source directory are the same. Tested-by: Jan Engelhardt Signed-off-by: Sam Ravnborg --- Makefile | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'Makefile') diff --git a/Makefile b/Makefile index 2738966e1d37..1b0d84d49612 100644 --- a/Makefile +++ b/Makefile @@ -115,7 +115,9 @@ saved-output := $(KBUILD_OUTPUT) KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd) $(if $(KBUILD_OUTPUT),, \ $(error output directory "$(saved-output)" does not exist)) - +# Check that OUTPUT directory is not the same as where we have kernel src +$(if $(filter-out $(KBUILD_OUTPUT),$(shell /bin/pwd)),, \ + $(error Output directory (O=...) specifies kernel src dir)) PHONY += $(MAKECMDGOALS) $(filter-out _all,$(MAKECMDGOALS)) _all: -- cgit v1.2.3-59-g8ed1b