Re: [Qemu-devel] [PATCH v14 2/8] make.rule: fix $(obj) to a real relative path

[Paolo Bonzini]

Il 16/10/2013 05:26, Fam Zheng ha scritto:
> Makefile.target includes rule.mak and unnested common-obj-y, then prefix
> them with '../', this will ignore object specific QEMU_CFLAGS in subdir
> Makefile.objs:
> 
>     $(obj)/curl.o: QEMU_CFLAGS += $(CURL_CFLAGS)
> 
> Because $(obj) here is './block', instead of '../block'. This doesn't
> hurt compiling because we basically build all .o from top Makefile,
> before entering Makefile.target, but it will affact arriving per-object
> libs support.
> 
> The starting point of $(obj) is passed in as argument of unnest-vars, as
> well as nested variables, so that different Makefiles can pass in a
> right value.
> 
> Signed-off-by: Fam Zheng <address@hidden>
> ---
>  Makefile        | 14 ++++++++++++++
>  Makefile.objs   | 17 +----------------
>  Makefile.target | 20 ++++++++++++++++----
>  configure       |  1 +
>  rules.mak       | 14 +++++++++-----
>  5 files changed, 41 insertions(+), 25 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index b15003f..94dae51 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -115,6 +115,16 @@ defconfig:
>  
>  ifneq ($(wildcard config-host.mak),)
>  include $(SRC_PATH)/Makefile.objs
> +endif
> +
> +dummy := $(call unnest-vars,, \
> +                stub-obj-y \
> +                util-obj-y \
> +                qga-obj-y \
> +                block-obj-y \
> +                common-obj-y)
> +
> +ifneq ($(wildcard config-host.mak),)
>  include $(SRC_PATH)/tests/Makefile
>  endif
>  ifeq ($(CONFIG_SMARTCARD_NSS),y)
> @@ -123,6 +133,10 @@ endif
>  
>  all: $(DOCS) $(TOOLS) $(HELPERS-y) recurse-all
>  
> +vl.o: QEMU_CFLAGS+=$(GPROF_CFLAGS)
> +
> +vl.o: QEMU_CFLAGS+=$(SDL_CFLAGS)
> +
>  config-host.h: config-host.h-timestamp
>  config-host.h-timestamp: config-host.mak
>  qemu-options.def: $(SRC_PATH)/qemu-options.hx
> diff --git a/Makefile.objs b/Makefile.objs
> index 2b6c1fe..91235a6 100644
> --- a/Makefile.objs
> +++ b/Makefile.objs
> @@ -41,7 +41,7 @@ libcacard-y += libcacard/vcardt.o
>  # single QEMU executable should support all CPUs and machines.
>  
>  ifeq ($(CONFIG_SOFTMMU),y)
> -common-obj-y = $(block-obj-y) blockdev.o blockdev-nbd.o block/
> +common-obj-y = blockdev.o blockdev-nbd.o block/
>  common-obj-y += net/
>  common-obj-y += readline.o
>  common-obj-y += qdev-monitor.o device-hotplug.o
> @@ -110,18 +110,3 @@ version-lobj-$(CONFIG_WIN32) += $(BUILD_DIR)/version.lo
>  # by libqemuutil.a.  These should be moved to a separate .json schema.
>  qga-obj-y = qga/ qapi-types.o qapi-visit.o
>  qga-vss-dll-obj-y = qga/
> -
> -vl.o: QEMU_CFLAGS+=$(GPROF_CFLAGS)
> -
> -vl.o: QEMU_CFLAGS+=$(SDL_CFLAGS)
> -
> -QEMU_CFLAGS+=$(GLIB_CFLAGS)
> -
> -nested-vars += \
> -     stub-obj-y \
> -     util-obj-y \
> -     qga-obj-y \
> -     qga-vss-dll-obj-y \
> -     block-obj-y \
> -     common-obj-y
> -dummy := $(call unnest-vars)
> diff --git a/Makefile.target b/Makefile.target
> index 9a49852..fb3a970 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -143,13 +143,25 @@ endif # CONFIG_SOFTMMU
>  # Workaround for http://gcc.gnu.org/PR55489, see configure.
>  %/translate.o: QEMU_CFLAGS += $(TRANSLATE_OPT_CFLAGS)
>  
> -nested-vars += obj-y
> +dummy := $(call unnest-vars,,obj-y)
>  
> -# This resolves all nested paths, so it must come last
> +# we are making another call to unnest-vars with different vars, protect 
> obj-y,
> +# it can be overriden in subdir Makefile.objs
> +obj-y-save := $(obj-y)
> +
> +block-obj-y :=
> +common-obj-y :=
>  include $(SRC_PATH)/Makefile.objs
> +dummy := $(call unnest-vars,..,block-obj-y common-obj-y)
> +
> +# Now restore obj-y
> +obj-y := $(obj-y-save)
> +
> +all-obj-y = $(obj-y) $(common-obj-y)
>  
> -all-obj-y = $(obj-y)
> -all-obj-y += $(addprefix ../, $(common-obj-y))
> +ifdef CONFIG_SOFTMMU
> +all-obj-y += $(block-obj-y)
> +endif

Just:

all-obj-$(CONFIG_SOFTMMU) += $(block-obj-y)

>  ifndef CONFIG_HAIKU
>  LIBS+=-lm
> diff --git a/configure b/configure
> index 57ee62a..3381264 100755
> --- a/configure
> +++ b/configure
> @@ -2283,6 +2283,7 @@ fi
>  if $pkg_config --atleast-version=$glib_req_ver gthread-2.0; then
>      glib_cflags=`$pkg_config --cflags gthread-2.0`
>      glib_libs=`$pkg_config --libs gthread-2.0`
> +    CFLAGS="$glib_cflags $CFLAGS"
>      LIBS="$glib_libs $LIBS"
>      libs_qga="$glib_libs $libs_qga"
>  else
> diff --git a/rules.mak b/rules.mak
> index abc2e84..01e552e 100644
> --- a/rules.mak
> +++ b/rules.mak
> @@ -110,9 +110,6 @@ clean: clean-timestamp
>  
>  # magic to descend into other directories
>  
> -obj := .
> -old-nested-dirs :=
> -
>  define push-var
>  $(eval save-$2-$1 = $(value $1))
>  $(eval $1 :=)
> @@ -126,9 +123,11 @@ endef
>  
>  define unnest-dir
>  $(foreach var,$(nested-vars),$(call push-var,$(var),$1/))
> -$(eval obj := $(obj)/$1)
> +$(eval obj-parent-$1 := $(obj))
> +$(eval obj := $(if $(obj),$(obj)/$1,$1))
>  $(eval include $(SRC_PATH)/$1/Makefile.objs)
> -$(eval obj := $(patsubst %/$1,%,$(obj)))
> +$(eval obj := $(obj-parent-$1))
> +$(eval obj-parent-$1 := )
>  $(foreach var,$(nested-vars),$(call pop-var,$(var),$1/))
>  endef
>  
> @@ -143,7 +142,12 @@ $(if $(nested-dirs),
>  endef
>  
>  define unnest-vars
> +$(eval obj := $1)
> +$(eval nested-vars := $2)
> +$(eval old-nested-dirs := )
>  $(call unnest-vars-1)
> +$(if $1,$(foreach v,$(nested-vars),$(eval \
> +     $v := $(addprefix $1/,$($v)))))
>  $(foreach var,$(nested-vars),$(eval $(var) := $(filter-out %/, $($(var)))))
>  $(shell mkdir -p $(sort $(foreach var,$(nested-vars),$(dir $($(var))))))
>  $(foreach var,$(nested-vars), $(eval \
>