Re: [Qemu-devel] [PATCH] build: Cleanup qga make output

[Adam Litke <agl@us.ibm.com>]

On Tue, Dec 13, 2011 at 10:23:18AM -0200, Luiz Capitulino wrote:
> On Mon, 12 Dec 2011 17:38:36 -0600
> Michael Roth <mdroth@linux.vnet.ibm.com> wrote:
> 
> > On 12/12/2011 05:03 PM, Anthony Liguori wrote:
> > > On 12/07/2011 10:33 AM, Adam Litke wrote:
> > >> Currently the make variable qapi-dir refers to the qapi-generated
> > >> directory in
> > >> absolute terms. This causes the harmless but ugly make output below. By
> > >> changing this variable to the relative path the output conforms to the
> > >> norm and
> > >> the build works fine.
> > >>
> > >> Before patch:
> > >> CC /home/aglitke/src/qemu/qapi-generated/qga-qapi-types.o
> > >> CC /home/aglitke/src/qemu/qapi-generated/qga-qapi-visit.o
> > >> CC /home/aglitke/src/qemu/qapi-generated/qga-qmp-marshal.o
> > >> After patch:
> > >> CC qapi-generated/qga-qapi-types.o
> > >> CC qapi-generated/qga-qapi-visit.o
> > >> CC qapi-generated/qga-qmp-marshal.o
> > >
> > > This was supposedly to fix a build issue that I was never able to
> > > reproduce. I think Luiz could reproduce it though. Luiz, could you try
> > > out Adam's patch and confirm it breaks for you?
> 
> It doesn't :( I also tried to reproduce again with -rc4 (which was the
> version I was getting it) but it doesn't happen anymore.
> 
> > I think that was Stefano:
> > 
> > http://lists.gnu.org/archive/html/qemu-devel/2011-11/msg02752.html
> > 
> > Stefano had a patch that fixed a build breakage he saw with dirty 
> > directories by setting:
> > 
> > qapi-dir := $(SRC_DIR)/qapi-generated
> > 
> > That patch ended up breaking the build for others, however, and was 
> > reverted.
> > 
> > This patch was an improvement on the original, but we'd all agreed that 
> > it wasn't necessary since we don't support working around issues related 
> > to dirty directories.

I am lacking some context here.  I am confused how a dirty directory could
change the output in this way.

> What kind of issue? I'm 100% certain that my tree was clean, the only
> thing I did not do was to clone it again.
> 
> We have had races when building the qapi in the past, maybe that's the
> problem and commit 9b12940 makes it less likely.
> 
> We could revert it and wait for the problem to happen again...

I would be fine with doing whatever is least likely to cause anyone else
problems.  I wouldn't want to break the actual build just to make the output
look nice.

> 
> > 
> > So if it's ugly, we can safely drop it.
> > 
> > >
> > > Regards,
> > >
> > > Anthony Liguori
> > >
> > >>
> > >> Signed-off-by: Adam Litke<agl@us.ibm.com>
> > >> ---
> > >> Makefile | 2 +-
> > >> 1 files changed, 1 insertions(+), 1 deletions(-)
> > >>
> > >> diff --git a/Makefile b/Makefile
> > >> index 301c75e..7c93739 100644
> > >> --- a/Makefile
> > >> +++ b/Makefile
> > >> @@ -168,7 +168,7 @@ check-qjson: check-qjson.o $(qobject-obj-y)
> > >> $(tools-obj-y)
> > >> test-coroutine: test-coroutine.o qemu-timer-common.o async.o
> > >> $(coroutine-obj-y) $(tools-obj-y)
> > >>
> > >> $(qapi-obj-y): $(GENERATED_HEADERS)
> > >> -qapi-dir := $(BUILD_DIR)/qapi-generated
> > >> +qapi-dir := qapi-generated
> > >> test-visitor.o test-qmp-commands.o qemu-ga$(EXESUF): QEMU_CFLAGS += -I
> > >> $(qapi-dir)
> > >> qemu-ga$(EXESUF): LIBS = $(LIBS_QGA)
> > >>
> > >
> > >
> > 
> 

-- 
Adam Litke <agl@us.ibm.com>
IBM Linux Technology Center