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-rw-r--r--Makefile13
1 files changed, 11 insertions, 2 deletions
diff --git a/Makefile b/Makefile
index cc1ca6d2068f..7dafc36ebcbf 100644
--- a/Makefile
+++ b/Makefile
@@ -238,8 +238,17 @@ tinderbox toolchains kernel-toolchains: .MAKE
${TGTS}:
${_+_}@cd ${.CURDIR}; ${_MAKE} ${.TARGET}
-# Set a reasonable default
-.MAIN: all
+# The historic default "all" target creates files which may cause stale
+# or (in the cross build case) unlinkable results. Fail with an error
+# when no target is given. The users can explicitly specify "all"
+# if they want the historic behavior.
+.MAIN: _guard
+
+_guard:
+ @echo
+ @echo "Explicit target required (use \"all\" for historic behavior)"
+ @echo
+ @false
STARTTIME!= LC_ALL=C date
CHECK_TIME!= find ${.CURDIR}/sys/sys/param.h -mtime -0s ; echo