[PATCH v5 0/2] Makefile: libfdt: build only the strict necessary

[PATCH v5 0/2] Makefile: libfdt: build only the strict necessary

[Claudio Fontana]

v4 -> v5:

* include the dtc submodule update commit in the 1/2 patch

v3 -> v4: NB! only useful when updating to latest dtc (not in QEMU yet)

* changed the approach to leverage new upstream dtc Makefile,
  needs dtc submodule update to include upstream dtc commit
  85e5d839847af54efab170f2b1331b2a6421e647.

* LIBFDT_srcdir does not exist anymore in upstream dtc: it is also
  not used anymore.

* LIBFDT_lib: need to avoid building libfdt.so at least for now, so pass as
  empty to avoid building the .so. This is to avoid breaking existing
  trees with objects already compiled without -fPIC.

* clean: no need to make dtc clean target, every artifact is captured by
  global clean rule

v2 -> v3:

* changed into a 2 patch series; in the second patch we remove the old
  compatibility gunks that were meant for removal some time after 4.1.

* renamed the libfdt PHONY rule to dtc/all, with the intent to make
  existing working trees forward and backward compatible across the change.

v1 -> v2:

* fix error generated when running UNCHECKED_GOALS without prior configure,
  for example during make docker-image-fedora. Without configure, DSOSUF is
  empty, and the module pattern rule in rules.mak that uses this variable
  can match too much; provide a default in the Makefile to avoid it.

* only attempt to build the archive when there is a non-empty list of objects.
  This could be done in general for the %.a: pattern in rules.mak, but maybe
  there are valid reasons to build an empty .a?

* removed some intermediate variables that did not add much value
  (LIBFDT_srcdir, LIBFDT_archive)

Tested locally with 3 VPATH configurations (no-, VPATH, VPATH in src subdir),
and with docker-image-fedora, docker-test-debug@fedora that failed before.

Claudio Fontana (2):
  Makefile: libfdt: build only the strict necessary
  Makefile: remove old compatibility gunks

 Makefile  | 32 ++++++++++++++++----------------
 configure |  6 +-----
 rules.mak |  2 ++
 3 files changed, 19 insertions(+), 21 deletions(-)

-- 
2.16.4

[PATCH v5 1/2] Makefile: dtc: update, build the libfdt target

[Claudio Fontana]

dtc submodule update, now call the libfdt target from the new
dtc Makefile, which has been changed to not require bison, flex, etc.
This removes warnings during the build.

scripts/ symlink and tests directory creation are not necessary,
and neither is calling the clean rule explicitly.

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 Makefile  | 10 +++++-----
 configure |  1 -
 dtc       |  2 +-
 3 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/Makefile b/Makefile
index 34275f57c9..36a6454295 100644
--- a/Makefile
+++ b/Makefile
@@ -526,13 +526,14 @@ $(SOFTMMU_FUZZ_RULES): $(edk2-decompressed)
 $(TARGET_DIRS_RULES):
 	$(call quiet-command,$(MAKE) $(SUBDIR_MAKEFLAGS) -C $(dir $@) V="$(V)" TARGET_DIR="$(dir $@)" $(notdir $@),)
 
-DTC_MAKE_ARGS=-I$(SRC_PATH)/dtc VPATH=$(SRC_PATH)/dtc -C dtc V="$(V)" LIBFDT_srcdir=$(SRC_PATH)/dtc/libfdt
+# LIBFDT_lib="": avoid breaking existing trees with objects requiring -fPIC
+DTC_MAKE_ARGS=-I$(SRC_PATH)/dtc VPATH=$(SRC_PATH)/dtc -C dtc V="$(V)" LIBFDT_lib=""
 DTC_CFLAGS=$(CFLAGS) $(QEMU_CFLAGS)
-DTC_CPPFLAGS=-I$(BUILD_DIR)/dtc -I$(SRC_PATH)/dtc -I$(SRC_PATH)/dtc/libfdt
+DTC_CPPFLAGS=-I$(SRC_PATH)/dtc/libfdt
 
 .PHONY: dtc/all
-dtc/all: .git-submodule-status dtc/libfdt dtc/tests
-	$(call quiet-command,$(MAKE) $(DTC_MAKE_ARGS) CPPFLAGS="$(DTC_CPPFLAGS)" CFLAGS="$(DTC_CFLAGS)" LDFLAGS="$(QEMU_LDFLAGS)" ARFLAGS="$(ARFLAGS)" CC="$(CC)" AR="$(AR)" LD="$(LD)" $(SUBDIR_MAKEFLAGS) libfdt/libfdt.a,)
+dtc/all: .git-submodule-status dtc/libfdt
+	$(call quiet-command,$(MAKE) $(DTC_MAKE_ARGS) CPPFLAGS="$(DTC_CPPFLAGS)" CFLAGS="$(DTC_CFLAGS)" LDFLAGS="$(QEMU_LDFLAGS)" ARFLAGS="$(ARFLAGS)" CC="$(CC)" AR="$(AR)" LD="$(LD)" $(SUBDIR_MAKEFLAGS) libfdt,)
 
 dtc/%: .git-submodule-status
 	@mkdir -p $@
@@ -820,7 +821,6 @@ distclean: clean
 	rm -rf $$d || exit 1 ; \
         done
 	rm -Rf .sdk
-	if test -f dtc/version_gen.h; then $(MAKE) $(DTC_MAKE_ARGS) clean; fi
 
 KEYMAPS=da     en-gb  et  fr     fr-ch  is  lt  no  pt-br  sv \
 ar      de     en-us  fi  fr-be  hr     it  lv  nl         pl  ru     th \
diff --git a/configure b/configure
index 26084fc53a..069ce34611 100755
--- a/configure
+++ b/configure
@@ -4281,7 +4281,6 @@ EOF
           mkdir -p dtc
           if [ "$pwd_is_source_path" != "y" ] ; then
               symlink "$source_path/dtc/Makefile" "dtc/Makefile"
-              symlink "$source_path/dtc/scripts" "dtc/scripts"
           fi
           fdt_cflags="-I\$(SRC_PATH)/dtc/libfdt"
           fdt_ldflags="-L\$(BUILD_DIR)/dtc/libfdt"
diff --git a/dtc b/dtc
index 88f18909db..85e5d83984 160000
--- a/dtc
+++ b/dtc
@@ -1 +1 @@
-Subproject commit 88f18909db731a627456f26d779445f84e449536
+Subproject commit 85e5d839847af54efab170f2b1331b2a6421e647
-- 
2.16.4

[PATCH v5 2/2] Makefile: remove old compatibility gunks

[Claudio Fontana]

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 Makefile | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/Makefile b/Makefile
index 36a6454295..2873d59ea2 100644
--- a/Makefile
+++ b/Makefile
@@ -562,12 +562,6 @@ slirp/all: .git-submodule-status
 		CC="$(CC)" AR="$(AR)" 	LD="$(LD)" RANLIB="$(RANLIB)"	\
 		CFLAGS="$(QEMU_CFLAGS) $(CFLAGS)" LDFLAGS="$(QEMU_LDFLAGS)")
 
-# Compatibility gunk to keep make working across the rename of targets
-# for recursion, to be removed some time after 4.1.
-subdir-dtc: dtc/all
-subdir-capstone: capstone/all
-subdir-slirp: slirp/all
-
 $(filter %/all, $(TARGET_DIRS_RULES)): libqemuutil.a $(common-obj-y) \
 	$(qom-obj-y)
 
-- 
2.16.4

[PATCH v5 2/2] Makefile: remove old compatibility gunks

[Claudio Fontana]

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 Makefile | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/Makefile b/Makefile
index 36a6454295..2873d59ea2 100644
--- a/Makefile
+++ b/Makefile
@@ -562,12 +562,6 @@ slirp/all: .git-submodule-status
 		CC="$(CC)" AR="$(AR)" 	LD="$(LD)" RANLIB="$(RANLIB)"	\
 		CFLAGS="$(QEMU_CFLAGS) $(CFLAGS)" LDFLAGS="$(QEMU_LDFLAGS)")
 
-# Compatibility gunk to keep make working across the rename of targets
-# for recursion, to be removed some time after 4.1.
-subdir-dtc: dtc/all
-subdir-capstone: capstone/all
-subdir-slirp: slirp/all
-
 $(filter %/all, $(TARGET_DIRS_RULES)): libqemuutil.a $(common-obj-y) \
 	$(qom-obj-y)
 
-- 
2.16.4