[libvirt] [PATCH] build: fix building with '--enable-test-locking'

[Martin Kletzander]

On Wed, Dec 18, 2013 at 06:09:40AM -0700, Eric Blake wrote:
> On 12/18/2013 02:35 AM, Martin Kletzander wrote:
> > When test-locking is enabled, CFLAGS have -Dbool=char, which makes
>
> Huh?  bool should never be defined to char in CFLAGS; it should only be
> replaced if gnulib thinks the compiler is too old.
>

Gnulib doesn't do that, it's our configure.ac thing (but I must say I
don't know whether that's copied from somewhere or not) introduced in
6962a2dd7e:

AC_ARG_ENABLE([test-locking],
  [AS_HELP_STRING([--enable-test-locking],
    [thread locking tests using CIL @<:@default=no@:>@])],
[case "${enableval}" in
   yes|no) ;;
   *)      AC_MSG_ERROR([bad value ${enableval} for test-locking option]) ;;
 esac],
              [enableval=no])
enable_locking=$enableval

if test "$enable_locking" = "yes"; then
  LOCK_CHECKING_CFLAGS="-Dbool=char -D_Bool=char -save-temps"
  AC_SUBST([LOCK_CHECKING_CFLAGS])
fi
AM_CONDITIONAL([WITH_CIL],[test "$enable_locking" = "yes"])

> > pipefd[bool] fail (obviously).  Forcing the subscript to be bool by
> > double negation fixes the build breaker.
>
> I don't get how this could possibly make a difference.  The 'output'
> variable is declared bool, and then only ever assigned 'false' or
> 'true', which if bool is replaced by gnulib are still guaranteed to be 0
> and 1, so using it directly as an array index is still safe.
>

But the thing is that due to -Dbool=char the variable is declared
char, not bool.

> >
> > Signed-off-by: Martin Kletzander <mkletzan at redhat.com>
> > ---
> >
> > Notes:
> >     I still can't build with '--enable-test-locking' and I'm not sure this
> >     is the proper way to fix it.  Also, the code wasn't touched for
> >     months, so I'm not pushing it as a build-breaker.
>
> NACK.  I need more details about the actual failure you are seeing, but
> this is not the right patch.
>
> --
> Eric Blake   eblake redhat com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
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