From 9c76b077d681914d462c1fe1fb53ef23eb4eb449 Mon Sep 17 00:00:00 2001
From: Roy Marples <roy@marples.name>
Date: Mon, 20 Oct 2008 12:09:14 +0000
Subject: Enable use of .depend on gmake. Also, generate extra dependencies for
 our shared libraries.

---
 mk/depend.mk | 12 +++++++-----
 mk/lib.mk    |  5 +++++
 mk/prog.mk   |  2 ++
 3 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/mk/depend.mk b/mk/depend.mk
index bec382e5..2ae6e1e8 100644
--- a/mk/depend.mk
+++ b/mk/depend.mk
@@ -1,8 +1,5 @@
-# This only works for make implementations that always include a .depend if
-# it exists. Only GNU make does not do this.
-
+# Generate .depend
 # Copyright 2008 Roy Marples <roy@marples.name>
-# All rights reserved. Released under the 2-clause BSD license.
 
 CLEANFILES+=	.depend
 IGNOREFILES+=	.depend
@@ -10,4 +7,9 @@ IGNOREFILES+=	.depend
 .depend: ${SRCS}
 	${CC} ${CPPFLAGS} -MM ${SRCS} > .depend
 
-depend: .depend
+depend: .depend extra_depend
+
+# Nasty hack for gmake which does not automatically include .depend
+# if it exists, unlike every other make implementation.
+INC_DEPEND= $(shell if test -e .depend; then echo ".depend"; else echo ""; fi)
+include ${INC_DEPEND}
diff --git a/mk/lib.mk b/mk/lib.mk
index a5ce0a88..e8b2eb7d 100644
--- a/mk/lib.mk
+++ b/mk/lib.mk
@@ -56,6 +56,11 @@ check test::
 clean:
 	rm -f ${OBJS} ${SOBJS} ${_LIBS} ${SHLIB_LINK} ${CLEANFILES}
 
+extra_depend:
+	@TMP=depend.$$$$; \
+	${SED} -e 's/^\([^\.]*\).o[ ]*:/\1.o \1.So:/' .depend > $${TMP}; \
+	mv $${TMP} .depend
+
 include ${MK}/sys.mk
 include ${MK}/os.mk
 include ${MK}/depend.mk
diff --git a/mk/prog.mk b/mk/prog.mk
index 288327e8..c44b380e 100644
--- a/mk/prog.mk
+++ b/mk/prog.mk
@@ -33,6 +33,8 @@ ${PROG}: ${SCRIPTS} ${OBJS}
 clean:
 	rm -f ${CLEANFILES}
 
+extra_depend:
+
 include ${MK}/sys.mk
 include ${MK}/os.mk
 include ${MK}/depend.mk
-- 
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