1 files changed, 63 insertions, 0 deletions
diff --git a/contrib/bmake/mk/whats.mk b/contrib/bmake/mk/whats.mk
new file mode 100644
index 0000000..d17c3ef
--- /dev/null
+++ b/contrib/bmake/mk/whats.mk
@@ -0,0 +1,63 @@
+# $Id: whats.mk,v 1.1 2014/08/30 22:40:47 sjg Exp $
+#
+#	@(#) Copyright (c) 2014, Simon J. Gerraty
+#
+#	This file is provided in the hope that it will
+#	be of use.  There is absolutely NO WARRANTY.
+#	Permission to copy, redistribute or otherwise
+#	use this file is hereby granted provided that 
+#	the above copyright notice and this notice are
+#	left intact. 
+#      
+#	Please send copies of changes and bug-fixes to:
+#	sjg@crufty.net
+#
+
+.if ${MK_WHATSTRING:Uno} != "no"
+what_build_exts?= o
+# it can be useful to embed a what(1) string in binaries 
+# so that the build location can be seen from a core file.
+.if defined(PROG) && ${.MAKE.MAKEFILES:M*prog.mk} != ""
+what_thing?= ${PROGNAME:U${PROG}}
+what_build_thing?= ${PROG}
+.elif defined(LIB) && ${.MAKE.MAKEFILES:M*lib.mk} != ""
+# probably only makes sense for shared libs
+# and the plumbing needed varies depending on *lib.mk
+what_thing?= lib${LIB}
+.if !empty(SOBJS)
+_soe:= ${SOBJS:E:[1]}
+what_build_exts= ${_soe}
+SOBJS+= ${what_uuid}.${_soe}
+.endif
+.elif defined(KMOD) && ${.MAKE.MAKEFILES:M*kmod.mk} != ""
+what_thing?= ${KMOD}
+what_build_thing?= ${KMOD}.ko
+.endif
+
+.if !empty(what_thing)
+# a unique name that won't conflict with anything
+what_uuid = what_${.CURDIR:T:hash}
+
+.if !empty(what_build_thing)
+${what_build_thing}: ${what_build_exts:@e@${what_uuid}.$e@}
+.endif
+OBJS+= ${what_uuid}.o
+CLEANFILES+= ${what_uuid}.c
+
+# we do not need to capture this
+SUPPRESS_DEPEND+= *${what_uuid}.c
+
+SB?= ${SRCTOP:H}
+SB_LOCATION?= ${HOST}:${SB}
+what_location:= ${.OBJDIR:S,${SB},${SB_LOCATION},}
+
+# this works with clang and gcc
+_what_t= const char __attribute__ ((section(".data")))
+_what1:= @(\#)${what_thing:tu} built ${%Y%m%d:L:localtime} by ${USER}
+_what2:= @(\#)${what_location}
+
+${what_uuid}.c:
+	echo '${_what_t} ${what_uuid}1[] = "${_what1}";' > $@ ${.OODATE:MNO_META_CMP}
+	echo '${_what_t} ${what_uuid}2[] = "${_what2}";' >> $@
+.endif
+.endif