Re: [Qemu-devel] [PATCH ] [trivial] qapi: Build-depend on all json files

["Daniel P. Berrange" <berrange@redhat.com>]

On Thu, Feb 04, 2016 at 03:36:56PM +0000, Peter Maydell wrote:
> On 4 February 2016 at 15:32, Eric Blake <eblake@redhat.com> wrote:
> > On 02/04/2016 07:55 AM, Peter Maydell wrote:
> >> On 4 February 2016 at 14:39, Lluís Vilanova <vilanova@ac.upc.edu> wrote:
> >>> Dynamically detects the files used to generate QAPI code, thus ensuring
> >>> it's never out of sync with the sources.
> >>>
> >>> Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
> >>> ---
> >>>  Makefile |    6 ++----
> >>>  1 file changed, 2 insertions(+), 4 deletions(-)
> >>>
> >>> diff --git a/Makefile b/Makefile
> >>> index d0de2d4..627f772 100644
> >>> --- a/Makefile
> >>> +++ b/Makefile
> >>> @@ -269,10 +269,8 @@ $(SRC_PATH)/qga/qapi-schema.json $(SRC_PATH)/scripts/qapi-commands.py $(qapi-py)
> >>>                 $(gen-out-type) -o qga/qapi-generated -p "qga-" $<, \
> >>>                 "  GEN   $@")
> >>>
> >>> -qapi-modules = $(SRC_PATH)/qapi-schema.json $(SRC_PATH)/qapi/common.json \
> >>> -               $(SRC_PATH)/qapi/block.json $(SRC_PATH)/qapi/block-core.json \
> >>> -               $(SRC_PATH)/qapi/event.json $(SRC_PATH)/qapi/introspect.json \
> >>> -               $(SRC_PATH)/qapi/crypto.json
> >>> +qapi-modules = $(SRC_PATH)/qapi-schema.json
> >>> +qapi-modules += $(shell find $(SRC_PATH)/qapi -name "*.json")
> >>
> >> All the .json files are in the same directory, so I don't think we should
> >> need to use find here. Does
> >>
> >> qapi-modules += $(wildcard $(SRC_PATH)/qapi/*.json))
> >>
> >> work ?
> >
> > Does this wildcard affect what goes into a tarball? I'm worried that we
> > may run the risk of a stale .json file on one developer's machine
> > causing an unreproducible build on other machines where the file is not
> > found; explicit lists tend to be safer than wildcards.
> >
> > I won't reject the patch if others like it, but I won't approve it myself.
> 
> You need to ask Mike Roth about our tarball generation process, not me.
> 
> I do agree that this patch needs to make the case for why .json source
> files are special and should be wildcarded, when for instance all our
> C source files are explicitly listed in makefiles.

Yes, normal practice is that the files are listed in a Makefile that lives
in the same dir as the file. The qapi json files are not following that
since they live in a dir above. I'd be inclined to say any patch should
take us in line with source files, and thus look more like this:


diff --git a/Makefile b/Makefile
index b7b0f24..5481b57 100644
--- a/Makefile
+++ b/Makefile
@@ -161,7 +161,8 @@ dummy := $(call unnest-vars,, \
                 qom-obj-y \
                 io-obj-y \
                 common-obj-y \
-                common-obj-m)
+                common-obj-m \
+                qapi-modules)
 
 ifneq ($(wildcard config-host.mak),)
 include $(SRC_PATH)/tests/Makefile
@@ -269,10 +270,7 @@ $(SRC_PATH)/qga/qapi-schema.json $(SRC_PATH)/scripts/qapi-commands.py $(qapi-py)
                $(gen-out-type) -o qga/qapi-generated -p "qga-" $<, \
                "  GEN   $@")
 
-qapi-modules = $(SRC_PATH)/qapi-schema.json $(SRC_PATH)/qapi/common.json \
-               $(SRC_PATH)/qapi/block.json $(SRC_PATH)/qapi/block-core.json \
-               $(SRC_PATH)/qapi/event.json $(SRC_PATH)/qapi/introspect.json \
-               $(SRC_PATH)/qapi/crypto.json
+qapi-modules += $(SRC_PATH)/qapi-schema.json
 
 qapi-types.c qapi-types.h :\
 $(qapi-modules) $(SRC_PATH)/scripts/qapi-types.py $(qapi-py)
diff --git a/qapi/Makefile.objs b/qapi/Makefile.objs
index 2278970..a644a69 100644
--- a/qapi/Makefile.objs
+++ b/qapi/Makefile.objs
@@ -4,3 +4,10 @@ util-obj-y += string-input-visitor.o string-output-visitor.o
 util-obj-y += opts-visitor.o
 util-obj-y += qmp-event.o
 util-obj-y += qapi-util.o
+
+qapi-modules += common.json
+qapi-modules += block.json
+qapi-modules += block-core.json
+qapi-modules += event.json
+qapi-modules += introspect.json
+qapi-modules += crypto.json



NB, this is completely untested - i just hacked the makefile for purpose
of illustration.

Regards,
Daniel
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