[PATCH 0/9] libtracefs: Updates to the Makefile

[PATCH 0/9] libtracefs: Updates to the Makefile

[Steven Rostedt]

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

While cleaning up the libtraceevent Makefile using the libtracefs Makefiles as
guide, I found various issues with the libtracefs Makefiles.

This cleans up those issues.

Steven Rostedt (VMware) (9):
  libtracefs: Remove unused "bindir" from Makefile
  libtracefs: Remove unneeded blkflags from Makefile
  libtracefs: Fix sample intermediate build targets
  libtracefs: Add "DESCEND" output when descending into directories
    during build
  libtracefs: Have make clean output cleaner
  libtracefs: Quiet mv: cannot stat message for libtracefs.a
  libtracefs: Quiet "Nothing to be done for" messages
  libtracefs: Have sample build look cleaner
  libtracefs: Have make tags and TAGS honor O= build directory

 Makefile         | 66 ++++++++++++++++++++++++------------------------
 samples/Makefile | 15 ++++++-----
 scripts/utils.mk | 51 ++++++++++++++++++++++++++++++++++++-
 src/Makefile     |  4 ++-
 utest/Makefile   |  2 +-
 5 files changed, 95 insertions(+), 43 deletions(-)

-- 
2.33.0

[PATCH 1/9] libtracefs: Remove unused "bindir" from Makefile

[Steven Rostedt]

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

It appears the the bindir variables are not used to build or install the
library. Remove them from the Makefile as they just add unnecessary noise.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 Makefile | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/Makefile b/Makefile
index 85b3c39a867c..8ee80097d77f 100644
--- a/Makefile
+++ b/Makefile
@@ -52,8 +52,6 @@ endif
 
 libdir_relative ?= $(libdir_relative_temp)
 prefix ?= /usr/local
-bindir_relative = bin
-bindir = $(prefix)/$(bindir_relative)
 man_dir = $(prefix)/share/man
 man_dir_SQ = '$(subst ','\'',$(man_dir))'
 libdir = $(prefix)/$(libdir_relative)
@@ -82,10 +80,6 @@ export man_dir man_dir_SQ html_install html_install_SQ INSTALL
 export img_install img_install_SQ
 export DESTDIR DESTDIR_SQ
 
-# Shell quotes
-bindir_SQ = $(subst ','\'',$(bindir))
-bindir_relative_SQ = $(subst ','\'',$(bindir_relative))
-
 pound := \#
 
 HELP_DIR = -DHELP_DIR=$(html_install)
@@ -130,7 +124,7 @@ src		:= $(srctree)
 obj		:= $(objtree)
 bdir		:= $(obj)/lib/tracefs
 
-export prefix bindir src obj bdir
+export prefix src obj bdir
 
 LIBTRACEFS_STATIC = $(bdir)/libtracefs.a
 LIBTRACEFS_SHARED = $(bdir)/libtracefs.so.$(TRACEFS_VERSION)
-- 
2.33.0

[PATCH 2/9] libtracefs: Remove unneeded blkflags from Makefile

[Steven Rostedt]

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

The blkflags were leftover from copying from trace-cmd for handling the
blk tracer. They are not needed for the libtracefs library.
Remove them.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 Makefile | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/Makefile b/Makefile
index 8ee80097d77f..096f35d2c4a1 100644
--- a/Makefile
+++ b/Makefile
@@ -104,9 +104,6 @@ SILENT := $(if $(findstring s,$(filter-out --%,$(MAKEFLAGS))),1)
 test-build = $(if $(shell sh -c 'echo "$(1)" | \
 	$(CC) -o /dev/null -c -x c - > /dev/null 2>&1 && echo y'), $2)
 
-# have flush/fua block layer instead of barriers?
-blk-flags := $(call test-build,$(BLK_TC_FLUSH_SOURCE),-DHAVE_BLK_TC_FLUSH)
-
 ifeq ("$(origin O)", "command line")
 
   saved-output := $(O)
-- 
2.33.0

[PATCH 3/9] libtracefs: Fix sample intermediate build targets

[Steven Rostedt]

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

The target for compiling from *.c to *.o in the samples directory had:

  $(bdir)/%.o: %.c

But since the *.c files were extracted, they already included the $(bdir)
in the name, so the above was really matching: $(bdir)/$(bdir)/*.c and not
being used. Remove the extra $(bdir) from the target.

This also exposed a bug that $(CFLAGS) was not included, and the stream.c
failed to build because of the lacking -D_GNU_SOURCE.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 samples/Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/samples/Makefile b/samples/Makefile
index 6ee57fecacbd..2d0d2397c5b4 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -60,10 +60,10 @@ $(EXAMPLES): $(patsubst %,$(bdir)/%,$(TARGETS))
 ## name, and the file will not be discarded by make.
 #
 # $(bdir)/XX.o: $(bdir)/XX.c
-#	$(CC) -g -Wall -c -o $@ $^ -I../include/ $(LIBTRACEEVENT_INCLUDES)
+#	$(CC) -g -Wall $(CFLAGS) -c -o $@ $^ -I../include/ $(LIBTRACEEVENT_INCLUDES)
 
-$(bdir)/%.o: %.c
-	$(CC) -g -Wall -c -o $@ $^ -I../include/ $(LIBTRACEEVENT_INCLUDES)
+%.o: %.c
+	$(CC) -g -Wall $(CFLAGS) -c -o $@ $^ -I../include/ $(LIBTRACEEVENT_INCLUDES)
 
 clean:
 	$(RM) $(bdir)/*
-- 
2.33.0

[PATCH 4/9] libtracefs: Add "DESCEND" output when descending into directories during build

[Steven Rostedt]

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

Copy from the Linux kernel a "DESCEND" output when descending into a
directory during the build. This makes the output of the build a little
more informative knowing what directory the build is currently in.

Also add the target and not just the directory, as the build will descend
into the src directory twice with different targets, and just showing that
it goes into the src directory twice looks weird.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 Makefile         | 16 ++++++++--------
 scripts/utils.mk | 20 ++++++++++++++++++++
 2 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/Makefile b/Makefile
index 096f35d2c4a1..7ef85288abf1 100644
--- a/Makefile
+++ b/Makefile
@@ -182,7 +182,7 @@ test: force $(LIBTRACEFS_STATIC)
 ifneq ($(CUNIT_INSTALLED),1)
 	$(error CUnit framework not installed, cannot build unit tests))
 endif
-	$(Q)$(MAKE) -C $(src)/$(UTEST_DIR) $@
+	$(Q)$(call descend,$(src)/$(UTEST_DIR),$@)
 
 test_mem: test
 ifeq (, $(VALGRIND))
@@ -271,13 +271,13 @@ install_pkgconfig: $(PKG_CONFIG_FILE)
 		$(call do_install_pkgconfig_file,$(prefix))
 
 doc:
-	$(MAKE) -C $(src)/Documentation all
+	$(Q)$(call descend,$(src)/Documentation,all)
 
 doc_clean:
-	$(MAKE) -C $(src)/Documentation clean
+	$(Q)$(call descend,$(src)/Documentation,clean)
 
 install_doc:
-	$(MAKE) -C $(src)/Documentation install
+	$(Q)$(call descend,$(src)/Documentation,install)
 
 define build_uninstall_script
 	$(Q)mkdir $(BUILD_OUTPUT)/tmp_build
@@ -350,19 +350,19 @@ $(VERSION_FILE): force
 
 $(LIBTRACEFS_STATIC): force
 	$(Q)mkdir -p $(bdir)
-	$(Q)$(MAKE) -C $(src)/src $@
+	$(Q)$(call descend,$(src)/src,$@)
 
 $(bdir)/libtracefs.so.$(TRACEFS_VERSION): force
 	$(Q)mkdir -p $(bdir)
-	$(Q)$(MAKE) -C $(src)/src libtracefs.so
+	$(Q)$(call descend,$(src)/src,libtracefs.so)
 
 samples/sqlhist: $(LIBTRACEFS_STATIC)
-	$(Q)$(MAKE) -C $(src)/samples sqlhist
+	$(Q)$(call descend,$(src)/samples,sqlhist)
 
 sqlhist: samples/sqlhist
 
 samples: $(LIBTRACEFS_STATIC) force
-	$(Q)$(MAKE) -C $(src)/samples all
+	$(Q)$(call descend,$(src)/samples,all)
 
 clean:
 	$(MAKE) -C $(src)/utest clean
diff --git a/scripts/utils.mk b/scripts/utils.mk
index 0b3c0675b714..404b929a2b5f 100644
--- a/scripts/utils.mk
+++ b/scripts/utils.mk
@@ -3,6 +3,8 @@
 # Utils
 
  GOBJ		= $(notdir $(strip $@))
+ BASE1		= $(notdir $(strip $1))
+ BASE2		= $(notdir $(strip $2))
 
 
 ifeq ($(VERBOSE),1)
@@ -24,6 +26,7 @@ ifeq ($(findstring 1,$(SILENT)$(VERBOSE)),1)
   print_install =
   print_uninstall =
   print_update =
+  print_descend =
 else
   print_compile =		echo '  COMPILE            '$(GOBJ);
   print_app_build =		echo '  BUILD              '$(GOBJ);
@@ -35,6 +38,7 @@ else
   print_install =		echo '  INSTALL     '$1'	to	$(DESTDIR_SQ)$2';
   print_uninstall =		echo '  UNINSTALL     $(DESTDIR_SQ)$1';
   print_update =		echo '  UPDATE             '$(GOBJ);
+  print_descend =		echo '  DESCEND            '$(BASE1) $(BASE2);
 endif
 
 do_fpic_compile =					\
@@ -74,6 +78,22 @@ do_python_plugin_build =			\
 	($(print_plugin_build)			\
 	$(CC) $< -shared $(LDFLAGS) $(PYTHON_LDFLAGS) -o $@)
 
+ifneq ($(findstring $(MAKEFLAGS), w),w)
+PRINT_DIR = --no-print-directory
+else
+NO_SUBDIR = :
+endif
+
+#
+# Define a callable command for descending to a new directory
+#
+# Call by doing: $(call descend,directory[,target])
+#
+descend = \
+	($(print_descend)		\
+	$(MAKE) $(PRINT_DIR) -C $(1) $(2))
+
+
 define make_version.h
 	(echo '/* This file is automatically generated. Do not modify. */';		\
 	echo \#define VERSION_CODE $(shell						\
-- 
2.33.0

[PATCH 5/9] libtracefs: Have make clean output cleaner

[Steven Rostedt]

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

Instead of showing the files being removed by make clean, just output a
command stating what directory the clean is happening in.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 Makefile         | 13 +++++++------
 samples/Makefile |  2 +-
 scripts/utils.mk |  8 ++++++++
 src/Makefile     |  2 +-
 utest/Makefile   |  2 +-
 5 files changed, 18 insertions(+), 9 deletions(-)

diff --git a/Makefile b/Makefile
index 7ef85288abf1..58b4219e7b62 100644
--- a/Makefile
+++ b/Makefile
@@ -365,11 +365,12 @@ samples: $(LIBTRACEFS_STATIC) force
 	$(Q)$(call descend,$(src)/samples,all)
 
 clean:
-	$(MAKE) -C $(src)/utest clean
-	$(MAKE) -C $(src)/src clean
-	$(MAKE) -C $(src)/samples clean
-	$(RM) $(TARGETS) $(bdir)/*.a $(bdir)/*.so $(bdir)/*.so.* $(bdir)/*.o $(bdir)/.*.d
-	$(RM) $(PKG_CONFIG_FILE)
-	$(RM) $(VERSION_FILE)
+	$(Q)$(MAKE) -C $(src)/utest clean
+	$(Q)$(MAKE) -C $(src)/src clean
+	$(Q)$(MAKE) -C $(src)/samples clean
+	$(Q)$(call do_clean, \
+	  $(TARGETS) $(bdir)/*.a $(bdir)/*.so $(bdir)/*.so.* $(bdir)/*.o $(bdir)/.*.d \
+	  $(PKG_CONFIG_FILE) \
+	  $(VERSION_FILE))
 
 .PHONY: clean
diff --git a/samples/Makefile b/samples/Makefile
index 2d0d2397c5b4..8e2b53bbdfae 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -66,4 +66,4 @@ $(EXAMPLES): $(patsubst %,$(bdir)/%,$(TARGETS))
 	$(CC) -g -Wall $(CFLAGS) -c -o $@ $^ -I../include/ $(LIBTRACEEVENT_INCLUDES)
 
 clean:
-	$(RM) $(bdir)/*
+	$(Q)$(call do_clean,$(bdir)/*)
diff --git a/scripts/utils.mk b/scripts/utils.mk
index 404b929a2b5f..c9b908f1c5d9 100644
--- a/scripts/utils.mk
+++ b/scripts/utils.mk
@@ -2,9 +2,11 @@
 
 # Utils
 
+ PWD		:= $(shell /bin/pwd)
  GOBJ		= $(notdir $(strip $@))
  BASE1		= $(notdir $(strip $1))
  BASE2		= $(notdir $(strip $2))
+ BASEPWD	= $(notdir $(strip $(PWD)))
 
 
 ifeq ($(VERBOSE),1)
@@ -27,6 +29,7 @@ ifeq ($(findstring 1,$(SILENT)$(VERBOSE)),1)
   print_uninstall =
   print_update =
   print_descend =
+  print_clean =
 else
   print_compile =		echo '  COMPILE            '$(GOBJ);
   print_app_build =		echo '  BUILD              '$(GOBJ);
@@ -39,6 +42,7 @@ else
   print_uninstall =		echo '  UNINSTALL     $(DESTDIR_SQ)$1';
   print_update =		echo '  UPDATE             '$(GOBJ);
   print_descend =		echo '  DESCEND            '$(BASE1) $(BASE2);
+  print_clean =			echo '  CLEAN              '$(BASEPWD);
 endif
 
 do_fpic_compile =					\
@@ -78,6 +82,10 @@ do_python_plugin_build =			\
 	($(print_plugin_build)			\
 	$(CC) $< -shared $(LDFLAGS) $(PYTHON_LDFLAGS) -o $@)
 
+do_clean =					\
+	($(print_clean)				\
+	$(RM) $1)
+
 ifneq ($(findstring $(MAKEFLAGS), w),w)
 PRINT_DIR = --no-print-directory
 else
diff --git a/src/Makefile b/src/Makefile
index cda0a0cda6e3..8f258a218f97 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -61,7 +61,7 @@ $(OBJS): | $(bdir)
 $(DEPS): | $(bdir)
 
 clean:
-	$(RM) $(OBJS)
+	$(Q)$(call do_clean,$(OBJS))
 
 dep_includes := $(wildcard $(DEPS))
 
diff --git a/utest/Makefile b/utest/Makefile
index 48993650660c..d168b01a328c 100644
--- a/utest/Makefile
+++ b/utest/Makefile
@@ -40,4 +40,4 @@ dep_includes := $(wildcard $(DEPS))
 test: $(TARGETS)
 
 clean:
-	$(RM) $(TARGETS) $(bdir)/*.o $(bdir)/.*.d
+	$(Q)$(call do_clean,$(TARGETS) $(bdir)/*.o $(bdir)/.*.d)
-- 
2.33.0

[PATCH 6/9] libtracefs: Quiet mv: cannot stat message for libtracefs.a

[Steven Rostedt]

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

The following shows up on a normal make:

  mv: cannot stat '/work/git/libtracefs.git/lib/tracefs/libtracefs.a': No such file or directory

In order to help with a multithreaded make, the moving of the libtracefs.a
before removing it appears to fix some issues. But now we get a message if
it doesn't already exist. Only move it and remove it if it already exists.

Fixes: 550d8358 ("libtracefs: make the libtracefs.a gen more robust")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 scripts/utils.mk | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/scripts/utils.mk b/scripts/utils.mk
index c9b908f1c5d9..af0f14fcbfa7 100644
--- a/scripts/utils.mk
+++ b/scripts/utils.mk
@@ -60,7 +60,10 @@ do_app_build =						\
 
 do_build_static_lib =				\
 	($(print_static_lib_build)		\
-	mv $@ $@.rm; $(RM) $@.rm;  $(AR) rcs $@ $^)
+	if [ -f $@ ]; then			\
+	    mv $@ $@.rm; $(RM) $@.rm;		\
+	fi;					\
+	$(AR) rcs $@ $^)
 
 do_compile_shared_library =			\
 	($(print_shared_lib_compile)		\
-- 
2.33.0

[PATCH 7/9] libtracefs: Quiet "Nothing to be done for" messages

[Steven Rostedt]

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

When doing a make after everything is already built, we have "Nothing to
be done" messages that are rather annoying.

$ make
  DESCEND            src libtracefs.so
make[1]: Nothing to be done for 'libtracefs.so'.
  DESCEND            src libtracefs.a
make[1]: '/work/git/libtracefs.git/lib/tracefs/libtracefs.a' is up to date.

This is because the target in the src directory for these are already
done, so it reports there is nothing to be done, as that's what make does
if you specify a target (and the descent into he directory specifies the
target that is displayed).

By marking the target as .PHONY will suppress that message.

Because "libtracefs.so" depends on $(LIBTRACEFS_SHARED_SO), the latter
needs to be part of the .PHONY and not the former.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 src/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Makefile b/src/Makefile
index 8f258a218f97..f284c70a640a 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -70,3 +70,5 @@ ifneq ($(dep_includes),)
 endif
 
 $(bdir)/tracefs-sqlhist.o tracefs-sqlhist.o: sqlhist.tab.h
+
+.PHONY: $(LIBTRACEFS_SHARED_SO) $(LIBTRACEFS_STATIC)
-- 
2.33.0

[PATCH 8/9] libtracefs: Have sample build look cleaner

[Steven Rostedt]

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

The build of the samples directory just showed the raw commands. This is
inconsistent with the rest of the build system. Make it cleaner by showing
EXTRACT, COMPILE SAMPLE OBJ and COMPILE SAMPLE for the samples being
extracted and built.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 samples/Makefile |  9 +++++----
 scripts/utils.mk | 18 ++++++++++++++++++
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/samples/Makefile b/samples/Makefile
index 8e2b53bbdfae..8b2267482fbf 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -28,8 +28,9 @@ bdir := $(obj)/bin
 
 all: $(TARGETS)
 
-extract_example = \
-	cat $1 | sed -ne '/^EXAMPLE/,/FILES/ { /EXAMPLE/,+2d ; /^FILES/d ;  /^--/d ; p}' > $2
+ifeq ($(findstring 1,$(SILENT)$(VERBOSE)),1)
+else
+endif
 
 $(bdir)/sqlhist.c: ../Documentation/libtracefs-sql.txt
 	$(call extract_example,$<,$@)
@@ -50,7 +51,7 @@ $(TARGETS): $(bdir)
 sqlhist: $(bdir)/sqlhist
 
 $(bdir)/%: $(bdir)/%.o
-	$(CC) -o $@ $^ $(LIBTRACEFS_STATIC) $(LIBTRACEEVENT_LIBS)
+	$(call do_sample_build,$@,$^)
 
 $(EXAMPLES): $(patsubst %,$(bdir)/%,$(TARGETS))
 
@@ -63,7 +64,7 @@ $(EXAMPLES): $(patsubst %,$(bdir)/%,$(TARGETS))
 #	$(CC) -g -Wall $(CFLAGS) -c -o $@ $^ -I../include/ $(LIBTRACEEVENT_INCLUDES)
 
 %.o: %.c
-	$(CC) -g -Wall $(CFLAGS) -c -o $@ $^ -I../include/ $(LIBTRACEEVENT_INCLUDES)
+	$(call do_sample_obj,$@,$^)
 
 clean:
 	$(Q)$(call do_clean,$(bdir)/*)
diff --git a/scripts/utils.mk b/scripts/utils.mk
index af0f14fcbfa7..41b996008a73 100644
--- a/scripts/utils.mk
+++ b/scripts/utils.mk
@@ -30,6 +30,9 @@ ifeq ($(findstring 1,$(SILENT)$(VERBOSE)),1)
   print_update =
   print_descend =
   print_clean =
+  print_extract =
+  print_sample_build =
+  print_sample_obj =
 else
   print_compile =		echo '  COMPILE            '$(GOBJ);
   print_app_build =		echo '  BUILD              '$(GOBJ);
@@ -43,6 +46,9 @@ else
   print_update =		echo '  UPDATE             '$(GOBJ);
   print_descend =		echo '  DESCEND            '$(BASE1) $(BASE2);
   print_clean =			echo '  CLEAN              '$(BASEPWD);
+  print_extract =		echo '  EXTRACT            '$(GOBJ);
+  print_sample_build =		echo '  COMPILE SAMPLE     '$(GOBJ);
+  print_sample_obj =		echo '  COMPILE SAMPLE OBJ '$(GOBJ);
 endif
 
 do_fpic_compile =					\
@@ -89,6 +95,18 @@ do_clean =					\
 	($(print_clean)				\
 	$(RM) $1)
 
+extract_example =				\
+	$(Q)($(print_extract)			\
+	cat $1 | sed -ne '/^EXAMPLE/,/FILES/ { /EXAMPLE/,+2d ; /^FILES/d ;  /^--/d ; p}' > $2)
+
+do_sample_build =							\
+	$(Q)($(print_sample_build)					\
+	$(CC) -o $1 $2 $(LIBTRACEFS_STATIC) $(LIBTRACEEVENT_LIBS))
+
+do_sample_obj =									\
+	$(Q)($(print_sample_obj)						\
+	$(CC) -g -Wall $(CFLAGS) -c -o $1 $2 -I../include/ $(LIBTRACEEVENT_INCLUDES))
+
 ifneq ($(findstring $(MAKEFLAGS), w),w)
 PRINT_DIR = --no-print-directory
 else
-- 
2.33.0

[PATCH 9/9] libtracefs: Have make tags and TAGS honor O= build directory

[Steven Rostedt]

From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>

Currently if one does a "make O=/tmp/build tags" the tags are still built
in the source directory. Although this is uncommon to do, the tags (and
TAGS) target should still honor the build directory.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 Makefile | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/Makefile b/Makefile
index 58b4219e7b62..bf085bfdb800 100644
--- a/Makefile
+++ b/Makefile
@@ -198,7 +198,7 @@ endif
 		$(src)/$(UTEST_DIR)/$(UTEST_BINARY)
 
 define find_tag_files
-	find . -name '\.pc' -prune -o -name '*\.[ch]' -print -o -name '*\.[ch]pp' \
+	find $(src) -name '\.pc' -prune -o -name '*\.[ch]' -print -o -name '*\.[ch]pp' \
 		! -name '\.#' -print
 endef
 
@@ -221,18 +221,26 @@ $(BUILD_PREFIX): force
 $(PKG_CONFIG_FILE) : ${PKG_CONFIG_SOURCE_FILE}.template $(BUILD_PREFIX) $(VERSION_FILE)
 	$(Q) $(call do_make_pkgconfig_file,$(prefix))
 
-tags:	force
-	$(RM) tags
-	$(call find_tag_files) | xargs ctags --extra=+f --c-kinds=+px
+VIM_TAGS = $(obj)/tags
+EMACS_TAGS = $(obj)/TAGS
+CSCOPE_TAGS = $(obj)/cscope
 
-TAGS:	force
-	$(RM) TAGS
-	$(call find_tag_files) | xargs etags
+$(VIM_TAGS): force
+	$(RM) $@
+	$(call find_tag_files) | (cd $(obj) && xargs ctags --extra=+f --c-kinds=+px)
 
-cscope: force
-	$(RM) cscope*
+$(EMACS_TAGS): force
+	$(RM) $@
+	$(call find_tag_files) | (cd $(obj) && xargs etags)
+
+$(CSCOPE_TAGS): force
+	$(RM) $(obj)/cscope*
 	$(call find_tag_files) | cscope -b -q
 
+tags: $(VIM_TAGS)
+TAGS: $(EMACS_TAGS)
+cscope: $(CSCOPE_TAGS)
+
 ifeq ("$(DESTDIR)", "")
 # If DESTDIR is not defined, then test if after installing the library
 # and running ldconfig, if the library is visible by ld.so.
-- 
2.33.0