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Re: [libvirt] [PATCH] build: fix 'make dist' for ./configure --without-remote

On 05/25/2011 04:10 PM, Eric Blake wrote:
> On 05/15/2011 08:51 PM, Wen Congyang wrote:
>> At 05/12/2011 04:30 AM, Eric Blake Write:
>>> Anything generated that must end up in the tarball must either
>>> have unconditional rules for generation (remote_protocol.c) or
>>> must live in libvirt.git for the case where the person running
>>> 'make dist' has disabled the configure options that control the
>>> rebuild of the generated file (remote_protocol-structs).
>>> * src/Makefile.am (remote_protocol-structs): Add a dependency and
>>> document why it must live in git.
>>> ($(srcdir)/remote/%_protocol.c, $(srcdir)/remote/%_protocol.c):
>>> Unconditionally generate.
>>> ---
>>> This should be the last piece of the puzzle for fixing an issue
>>> that I first pointed out here:
>>> https://www.redhat.com/archives/libvir-list/2011-May/msg00343.html
> This patch still isn't in.  Should it be?

Actually, I've going ahead and pushing it under the build-breaker rule
(after fixing a nit below), since I was able to confirm that:

mkdir build
cd build
../configure --without-remote
make distcheck

failed without this patch, because remote_protocol.h was not in the
tarball and that resulted in make trying to (re)generate the file into a
read-only directory (make distcheck is time-consuming, but it's nice for
proving issues like this).  Furthermore, there was talk on IRC about the
daily snapshots not being generated lately, precisely because they are
being generated from a build configured --without-remote, so this should
help snapshot builds be more useful.

>>>  .PHONY: remote_protocol-structs
>>> -remote_protocol-structs:
>>> +remote_protocol-structs: libvirt_driver_remote_la-remote_protocol.$(OBJEXT)
>> This line will introduce another problem for ./configure --with-remote:
>> make[1]: *** No rule to make target `libvirt_driver_remote_la-remote_protocol.o', needed by `remote_protocol-structs'.  Stop.
>> make[1]: Leaving directory `/home/wency/source/libvirt-nodaemon/src'
>> make: *** [distdir] Error 1
> I can't reproduce that failure on Fedora 14.  What system were you on?
> Perhaps it is dependent on libtool version or automake version used to
> generate the Makefile?  Should I isolate this change from the rest of
> the patch, so that 'make dist' works better from a --without-remote setup?

Oh, I think I see it now.  libvirt_driver_remote_la-remote_protocol.o is
a side-effect of the libtool rule for creating
libvirt_driver_remote_la-remote_protocol.lo; so while the subsequent
pdwtags call operates directly on the .o file, the Makefile dependency
has to be on the witness .lo file that signifies whether the build has
been done.

I squashed this in:

diff --git i/src/Makefile.am w/src/Makefile.am
index 82cf6c4..c3d3102 100644
--- i/src/Makefile.am
+++ w/src/Makefile.am
@@ -207,7 +207,9 @@ r2 = /\* <[[:xdigit:]]+> \S+:\d+ \*/

 .PHONY: remote_protocol-structs
-remote_protocol-structs: libvirt_driver_remote_la-remote_protocol.$(OBJEXT)
+# The .o file that pdwtags parses is created as a side effect of running
+# libtool; but from make's perspective we depend on the .lo file.
+remote_protocol-structs: libvirt_driver_remote_la-remote_protocol.lo
 	$(AM_V_GEN)if (pdwtags --help) > /dev/null 2>&1; then		\
 	  pdwtags --verbose libvirt_driver_remote_la-remote_protocol.$(OBJEXT) \
 	    | perl -0777 -n						\

Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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