[Nbd] [PATCH] build: Silence autogen.sh warnings

[Eric Blake <eblake@...696...>]

Starting from a fresh git checkout, running ./autogen.sh gives a
couple of warnings on my Fedora 24 build tools, one from libtool:

libtoolize: Consider adding '-I support' to ACLOCAL_AMFLAGS in Makefile.am.

and one from automake:

tests/run/Makefile.am:4: warning: source file '$(top_srcdir)/cliserv.c' is in a subdirectory,
tests/run/Makefile.am:4: but option 'subdir-objects' is disabled
automake: warning: possible forward-incompatibility.
automake: At least a source file is in a subdirectory, but the 'subdir-objects'
automake: automake option hasn't been enabled.  For now, the corresponding output
automake: object file(s) will be placed in the top-level directory.  However,
automake: this behaviour will change in future Automake versions: they will
automake: unconditionally cause object files to be placed in the same subdirectory
automake: of the corresponding sources.
automake: You are advised to start using 'subdir-objects' option throughout your
automake: project, to avoid future incompatibilities.

Following the advice doesn't break anything, so let's do it.

I also noticed that the build leaves behind an untracked file.

Signed-off-by: Eric Blake <eblake@...696...>
---
 .gitignore   | 1 +
 Makefile.am  | 1 +
 configure.ac | 2 +-
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index b8163e0..a13897a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -38,6 +38,7 @@ install-sh
 configure
 man/*.sh
 man/*.sh.in
+man/manpage.log
 make-integrityhuge
 nbd-trdump
 missing
diff --git a/Makefile.am b/Makefile.am
index 32774e3..c1740d6 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,3 +1,4 @@
+ACLOCAL_AMFLAGS = -I support
 SUBDIRS = . man doc tests systemd gznbd
 bin_PROGRAMS = nbd-server nbd-trdump
 sbin_PROGRAMS = @NBD_CLIENT_NAME@
diff --git a/configure.ac b/configure.ac
index 83e4f91..ce225a6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -11,7 +11,7 @@ m4_define([serial_tests], [
               awk '{split ($NF,a,"."); if (a[1] == 1 && a[2] >= 12) { print "serial-tests" }}'
   ])
 ])
-AM_INIT_AUTOMAKE(foreign dist-xz serial_tests)
+AM_INIT_AUTOMAKE(foreign dist-xz serial_tests subdir-objects)
 AM_MAINTAINER_MODE([enable])
 AC_CONFIG_MACRO_DIR([support])
 LT_INIT
-- 
2.7.4