build: include a dummy config.sub and config.guess in releases

There is no hard requirement for a config.guess and config.sub script in
the release tarball. By passing --build=... and --host=... to
./configure, the scripts are not executed.  When doing local builds, the
./autogen.sh script (by running automake) will place a config.guess and
config.sub script in the root of the source tree. Upon creation of the
release ('make dist') tarball, the scripts are replaced by dummy copies
from the build-aux/ directory.

The main advantage to not include these scripts in the repository, is
that there is no need to track upstream updates for them either.

Change-Id: I5e930988a9e849ec5d0c84d2e30e61f2a9685f45
BUG: 1223937
Reported-by: Emmanuel Dreyfus <manu@netbsd.org>
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/14503
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>

.gitignore

@@ -5,6 +5,7 @@ config.*
 configure
 cscope.*
 depcomp
+INSTALL
 install-sh
 ltmain.sh
 Makefile

Makefile.am

@@ -44,7 +44,8 @@ dist-hook: gen-VERSION gen-ChangeLog
 	-rm -fr $(distdir)/contrib/argp-standalone/autom4te.cache
 	-rm -fr $(distdir)/contrib/argp-standalone/.deps
 	-rm -fr $(distdir)/contrib/umountd/.deps
-	-rm -fr $(distdir)/config.{guess,sub}
+	-cp -f $(top_srcdir)/build-aux/config.sub.dist $(distdir)/config.sub
+	-cp -f $(top_srcdir)/build-aux/config.guess.dist $(distdir)/config.guess
 
 .PHONY: gen-VERSION gen-ChangeLog
 

autogen.sh

@@ -85,7 +85,7 @@ $TOOL --automake --copy --force
 echo Running ${AUTOCONF}...
 $AUTOCONF
 echo Running ${AUTOMAKE}...
-$AUTOMAKE --add-missing --copy --foreign
+$AUTOMAKE --add-missing --force-missing --copy --foreign
 
 # Run autogen in the argp-standalone sub-directory
 echo "Running autogen.sh in argp-standalone ..."

build-aux/config.guess.dist

@@ -0,0 +1,14 @@
+#!/bin/sh
+#
+# This script is intentionally left empty. Distributions that package GlusterFS
+# may want to to replace it with an updated copy from the automake project.
+#
+
+cat << EOM
+It is not expected to execute this script. When you are building from a
+released tarball (generated with 'make dist'), you are expected to pass
+--build=... and --host=... to ./configure or replace this config.guess script
+in the sources with an updated version.
+EOM
+
+exit 0

build-aux/config.sub.dist

@@ -0,0 +1,14 @@
+#!/bin/sh
+#
+# This script is intentionally left empty. Distributions that package GlusterFS
+# may want to to replace it with an updated copy from the automake project.
+#
+
+cat << EOM
+It is not expected to execute this script. When you are building from a
+released tarball (generated with 'make dist'), you are expected to pass
+--build=... and --host=... to ./configure or replace this config.sub script in
+the sources with an updated version.
+EOM
+
+exit 0

glusterfs.spec.in

@@ -190,13 +190,16 @@ BuildRequires:    systemd-units
 
 Requires:         %{name}-libs%{?_isa} = %{version}-%{release}
 BuildRequires:    bison flex
-BuildRequires:    gcc make automake libtool
+BuildRequires:    gcc make libtool
 BuildRequires:    ncurses-devel readline-devel
 BuildRequires:    libxml2-devel openssl-devel
 BuildRequires:    libaio-devel libacl-devel
 BuildRequires:    python-devel
 BuildRequires:    python-ctypes
 BuildRequires:    userspace-rcu-devel >= 0.7
+%if ( 0%{?rhel} && 0%{?rhel} <= 6 )
+BuildRequires:    automake
+%endif
 %if ( 0%{?rhel} && 0%{?rhel} <= 5 )
 BuildRequires:    e2fsprogs-devel
 %else
@@ -575,7 +578,12 @@ CFLAGS=-DUSE_INSECURE_OPENSSL
 export CFLAGS
 %endif
 
-./autogen.sh && %configure \
+# RHEL6 and earlier need to manually replace config.guess and config.sub
+%if ( 0%{?rhel} && 0%{?rhel} <= 6 )
+./autogen.sh
+%endif
+
+%configure \
         %{?_with_cmocka} \
         %{?_with_debug} \
         %{?_with_tmpfilesdir} \