build: standardize clean/distclean targets in src

Changes:

* clean: remove the same types of files in src/prog.mk and src/so.mk
* distclean: remove unused recipes and DISTCLEANFILES variable

3 files changed, 8 insertions, 6 deletions

diff --git a/config.mk.in b/config.mk.in
index 6ee541507..8c9d61a2d 100644
--- a/config.mk.in
+++ b/config.mk.in
@@ -64,3 +64,5 @@ LIBS=@LIBS@
 
 EXTRA_CFLAGS +=@EXTRA_CFLAGS@
 EXTRA_LDFLAGS +=@EXTRA_LDFLAGS@
+
+CLEANFILES = *.o *.gcov *.gcda *.gcno *.plist
diff --git a/src/prog.mk b/src/prog.mk
index d138fc7ee..5ed706da9 100644
--- a/src/prog.mk
+++ b/src/prog.mk
@@ -3,7 +3,7 @@
 # Note: $(ROOT)/config.mk must be included before this file.
 #
 # The includer should probably define PROG and TARGET and may also want to
-# define EXTRA_HDRS, EXTRA_OBJS, CLEANFILES and DISTCLEANFILES.
+# define EXTRA_HDRS and EXTRA_OBJS and extend CLEANFILES.
 
 HDRS := $(sort $(wildcard *.h)) $(EXTRA_HDRS)
 SRCS := $(sort $(wildcard *.c))
@@ -33,7 +33,7 @@ $(PROG): $(OBJS) $(ROOT)/config.mk
         $(CC) $(PROG_LDFLAGS) $(LDFLAGS) -o $@ $(OBJS) $(LIBS)
 
 .PHONY: clean
-clean:; rm -fr *.o $(PROG) *.gcov *.gcda *.gcno *.plist $(CLEANFILES)
+clean:; rm -fr $(PROG) $(CLEANFILES)
 
 .PHONY: distclean
-distclean: clean; rm -fr $(DISTCLEANFILES)
+distclean: clean
diff --git a/src/so.mk b/src/so.mk
index f78f2aea6..ee5d94a0f 100644
--- a/src/so.mk
+++ b/src/so.mk
@@ -3,7 +3,7 @@
 # Note: $(ROOT)/config.mk must be included before this file.
 #
 # The includer should probably define SO and TARGET and may also want to define
-# EXTRA_HDRS, EXTRA_OBJS, CLEANFILES and DISTCLEANFILES.
+# EXTRA_HDRS and EXTRA_OBJS and extend CLEANFILES.
 
 HDRS := $(sort $(wildcard *.h)) $(EXTRA_HDRS)
 SRCS := $(sort $(wildcard *.c))
@@ -28,7 +28,7 @@ $(SO): $(OBJS) $(ROOT)/config.mk
         $(CC) $(SO_LDFLAGS) -shared -fPIC -z relro $(LDFLAGS) -o $@ $(OBJS) -ldl
 
 .PHONY: clean
-clean:; rm -fr $(OBJS) $(SO) *.plist $(CLEANFILES)
+clean:; rm -fr $(SO) $(CLEANFILES)
 
 .PHONY: distclean
-distclean: clean; rm -fr $(DISTCLEANFILES)
+distclean: clean