1 files changed, 69 insertions, 0 deletions
diff --git a/devel/bmake/files/mk/whats.mk b/devel/bmake/files/mk/whats.mk
new file mode 100644
index 00000000000..9d94ed67baa
--- /dev/null
+++ b/devel/bmake/files/mk/whats.mk
@@ -0,0 +1,69 @@
+# $Id: whats.mk,v 1.1.1.1 2020/05/24 05:35:53 nia Exp $
+#
+#	@(#) Copyright (c) 2014-2020, 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} == "yes"
+# 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(KMOD)
+what_thing ?= ${KMOD}
+.elif defined(LIB)
+what_thing ?= lib${LIB}
+.elif defined(PROG)
+what_thing ?= ${PROG}
+SRCS ?= ${PROG}.c
+.elif defined(SHLIB)
+what_thing ?= lib${SHLIB}
+.endif
+
+.if !empty(what_thing)
+# a unique name that won't conflict with anything
+what_uuid = what_${what_thing}_${.CURDIR:T:hash}
+what_var = what_${.CURDIR:T:hash}
+
+SRCS += ${what_uuid}.c
+CLEANFILES += ${what_uuid}.c
+# we do not need to capture this
+SUPPRESS_DEPEND += *${what_uuid}.c
+
+SB ?= ${SRCTOP:H}
+SB_LOCATION ?= ${HOST}:${SB}
+# make customization easy
+WHAT_LOCATION ?= ${.OBJDIR:S,${SB},${SB_LOCATION},}
+WHAT_1 ?= ${what_thing:tu} built ${%Y%m%d:L:localtime} by ${USER}
+WHAT_2 ?= ${what_location}
+WHAT_LINE_IDS ?= 1 2
+WHAT_NOCMP_LINE_IDS ?= 1
+# you can add other WHAT_* just be sure to set WHAT_LINE_IDS
+# and WHAT_NOCMP_LINE_IDS accordingly
+
+# this works with clang and gcc
+what_t = const char __attribute__ ((section(".data")))
+what_location := ${WHAT_LOCATION}
+
+# this script is done in multiple lines so we can
+# use the token ${.OODATE:MNO_META_CMP}
+# to prevent the variable parts making this constantly out-of-date
+${what_uuid}.c:
+	echo 'extern const char ${WHAT_LINE_IDS:@i@${what_var}_$i[]@:ts,};' > $@
+.for i in ${WHAT_LINE_IDS}
+.if ${WHAT_NOCMP_LINE_IDS:M$i} != ""
+	echo '${what_t} ${what_var}_$i[] = "@(#)${WHAT_$i}";' >> $@ ${.OODATE:MNO_META_CMP}
+.else
+	echo '${what_t} ${what_var}_$i[] = "@(#)${WHAT_$i}";' >> $@
+.endif
+.endfor
+
+.endif
+.endif