[libvirt] [PATCH] build: ensure 'make check' sees up-to-date config.h

[Nehal J Wani]

On Thu, Sep 19, 2013 at 4:02 AM, Eric Blake <eblake at redhat.com> wrote:
>
> Nehal J. Wani reported on IRC a rather interesting build failure:
>
> In file included from util/virnetdevbridge.c:53:0:
> /usr/include/linux/in6.h:30:8: error: redefinition of 'struct in6_addr'
>  struct in6_addr {
>         ^
>
> I traced it to the fact that he ran 'git pull; make check' across
> commit e62e0094.  What happened is that the configure changes
> result in a new variable that was set to be defined on his system,
> but config.h was not regenerated to contain the value of that
> variable.  Running 'make' instead of 'make check' cleaned up the
> problem.  A bit more investigation, and I see that in Makefile.am,
> automake sticks rules that rebuild config.h as part of 'make all',
> and that we also had a dependency 'check-local: all'; BUT the
> rule for check-local is run only at the point when the top-level
> directory is visited.  Automake documents that SUBDIRS should
> contain an explicit '.' at the point the top-level should be
> visited (defaulting to last, if it doesn't appear).  Sure enough,
> with this patch, 'make check' now does the top-level 'all' rules,
> which regenerates 'config.h' BEFORE compiling any code that might
> depend on changed content of that file.
>
> * Makefile.am (SUBDIRS): Put '.' first, not last.
>
> Signed-off-by: Eric Blake <eblake at redhat.com>
> ---
>
> Tough to argue the build-breaker rule on this one, since a
> fresh checkout doesn't hit it (only a 'make check' without
> a 'make', across an incremental build that happened to need
> new configure substitutions).  So I'll wait for a review
> for my one-liner.
>
>  Makefile.am |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/Makefile.am b/Makefile.am
> index 4e24ecf..66cb677 100644
> --- a/Makefile.am
> +++ b/Makefile.am
> @@ -19,7 +19,7 @@
>  LCOV = lcov
>  GENHTML = genhtml
>
> -SUBDIRS = gnulib/lib include src daemon tools docs gnulib/tests \
> +SUBDIRS = . gnulib/lib include src daemon tools docs gnulib/tests \
>    python tests po examples/domain-events/events-c examples/hellolibvirt \
>    examples/dominfo examples/domsuspend examples/python examples/apparmor \
>    examples/xml/nwfilter examples/openauth examples/systemtap
> --
> 1.7.1
>
> --
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Ping. If there is a specific reason why this was not pushed, I would
like to know.


Nehal J Wani