Minor modification to the configure.ac

Enables silent rules (use make V=1 to override)
Prints a summary after configure is completed

Makefile.in

@@ -75,11 +75,14 @@ POST_INSTALL = :
 NORMAL_UNINSTALL = :
 PRE_UNINSTALL = :
 POST_UNINSTALL = :
+build_triplet = @build@
+host_triplet = @host@
+target_triplet = @target@
 subdir = .
 DIST_COMMON = INSTALL NEWS README AUTHORS ChangeLog \
 	$(srcdir)/Makefile.in $(srcdir)/Makefile.am \
 	$(top_srcdir)/configure $(am__configure_deps) COPYING TODO \
-	compile depcomp install-sh missing
+	compile config.guess config.sub depcomp install-sh missing
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/configure.ac
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
@@ -246,14 +249,22 @@ am__quote = @am__quote@
 am__tar = @am__tar@
 am__untar = @am__untar@
 bindir = @bindir@
+build = @build@
 build_alias = @build_alias@
+build_cpu = @build_cpu@
+build_os = @build_os@
+build_vendor = @build_vendor@
 builddir = @builddir@
 datadir = @datadir@
 datarootdir = @datarootdir@
 docdir = @docdir@
 dvidir = @dvidir@
 exec_prefix = @exec_prefix@
+host = @host@
 host_alias = @host_alias@
+host_cpu = @host_cpu@
+host_os = @host_os@
+host_vendor = @host_vendor@
 htmldir = @htmldir@
 includedir = @includedir@
 infodir = @infodir@
@@ -273,7 +284,11 @@ sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
 sysconfdir = @sysconfdir@
+target = @target@
 target_alias = @target_alias@
+target_cpu = @target_cpu@
+target_os = @target_os@
+target_vendor = @target_vendor@
 top_build_prefix = @top_build_prefix@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@

config.guess

@@ -0,0 +1 @@
+/usr/share/automake-1.14/config.guess

config.sub

@@ -0,0 +1 @@
+/usr/share/automake-1.14/config.sub

configure

@@ -679,6 +679,18 @@ am__isrc
 INSTALL_DATA
 INSTALL_SCRIPT
 INSTALL_PROGRAM
+target_os
+target_vendor
+target_cpu
+target
+host_os
+host_vendor
+host_cpu
+host
+build_os
+build_vendor
+build_cpu
+build
 target_alias
 host_alias
 build_alias
@@ -1337,6 +1349,11 @@ Program names:
   --program-prefix=PREFIX            prepend PREFIX to installed program names
   --program-suffix=SUFFIX            append SUFFIX to installed program names
   --program-transform-name=PROGRAM   run sed PROGRAM on installed program names
+
+System types:
+  --build=BUILD     configure for building on BUILD [guessed]
+  --host=HOST       cross-compile to build programs to run on HOST [BUILD]
+  --target=TARGET   configure for building compilers for TARGET [HOST]
 _ACEOF
 fi
 
@@ -2309,8 +2326,6 @@ ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $
 ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
-am__api_version='1.14'
-
 ac_aux_dir=
 for ac_dir in "$srcdir" "$srcdir/.." "$srcdir/../.."; do
   if test -f "$ac_dir/install-sh"; then
@@ -2340,6 +2355,119 @@ ac_config_sub="$SHELL $ac_aux_dir/config.sub"  # Please don't use this var.
 ac_configure="$SHELL $ac_aux_dir/configure"  # Please don't use this var.
 
 
+# Make sure we can run config.sub.
+$SHELL "$ac_aux_dir/config.sub" sun4 >/dev/null 2>&1 ||
+  as_fn_error $? "cannot run $SHELL $ac_aux_dir/config.sub" "$LINENO" 5
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking build system type" >&5
+$as_echo_n "checking build system type... " >&6; }
+if ${ac_cv_build+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_build_alias=$build_alias
+test "x$ac_build_alias" = x &&
+  ac_build_alias=`$SHELL "$ac_aux_dir/config.guess"`
+test "x$ac_build_alias" = x &&
+  as_fn_error $? "cannot guess build type; you must specify one" "$LINENO" 5
+ac_cv_build=`$SHELL "$ac_aux_dir/config.sub" $ac_build_alias` ||
+  as_fn_error $? "$SHELL $ac_aux_dir/config.sub $ac_build_alias failed" "$LINENO" 5
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_build" >&5
+$as_echo "$ac_cv_build" >&6; }
+case $ac_cv_build in
+*-*-*) ;;
+*) as_fn_error $? "invalid value of canonical build" "$LINENO" 5;;
+esac
+build=$ac_cv_build
+ac_save_IFS=$IFS; IFS='-'
+set x $ac_cv_build
+shift
+build_cpu=$1
+build_vendor=$2
+shift; shift
+# Remember, the first character of IFS is used to create $*,
+# except with old shells:
+build_os=$*
+IFS=$ac_save_IFS
+case $build_os in *\ *) build_os=`echo "$build_os" | sed 's/ /-/g'`;; esac
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking host system type" >&5
+$as_echo_n "checking host system type... " >&6; }
+if ${ac_cv_host+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test "x$host_alias" = x; then
+  ac_cv_host=$ac_cv_build
+else
+  ac_cv_host=`$SHELL "$ac_aux_dir/config.sub" $host_alias` ||
+    as_fn_error $? "$SHELL $ac_aux_dir/config.sub $host_alias failed" "$LINENO" 5
+fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_host" >&5
+$as_echo "$ac_cv_host" >&6; }
+case $ac_cv_host in
+*-*-*) ;;
+*) as_fn_error $? "invalid value of canonical host" "$LINENO" 5;;
+esac
+host=$ac_cv_host
+ac_save_IFS=$IFS; IFS='-'
+set x $ac_cv_host
+shift
+host_cpu=$1
+host_vendor=$2
+shift; shift
+# Remember, the first character of IFS is used to create $*,
+# except with old shells:
+host_os=$*
+IFS=$ac_save_IFS
+case $host_os in *\ *) host_os=`echo "$host_os" | sed 's/ /-/g'`;; esac
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking target system type" >&5
+$as_echo_n "checking target system type... " >&6; }
+if ${ac_cv_target+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test "x$target_alias" = x; then
+  ac_cv_target=$ac_cv_host
+else
+  ac_cv_target=`$SHELL "$ac_aux_dir/config.sub" $target_alias` ||
+    as_fn_error $? "$SHELL $ac_aux_dir/config.sub $target_alias failed" "$LINENO" 5
+fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_target" >&5
+$as_echo "$ac_cv_target" >&6; }
+case $ac_cv_target in
+*-*-*) ;;
+*) as_fn_error $? "invalid value of canonical target" "$LINENO" 5;;
+esac
+target=$ac_cv_target
+ac_save_IFS=$IFS; IFS='-'
+set x $ac_cv_target
+shift
+target_cpu=$1
+target_vendor=$2
+shift; shift
+# Remember, the first character of IFS is used to create $*,
+# except with old shells:
+target_os=$*
+IFS=$ac_save_IFS
+case $target_os in *\ *) target_os=`echo "$target_os" | sed 's/ /-/g'`;; esac
+
+
+# The aliases save the names the user supplied, while $host etc.
+# will get canonicalized.
+test -n "$target_alias" &&
+  test "$program_prefix$program_suffix$program_transform_name" = \
+    NONENONEs,x,x, &&
+  program_prefix=${target_alias}-
+
+am__api_version='1.14'
+
 # Find a good install program.  We prefer a C program (faster),
 # so one script is as good as another.  But avoid the broken or
 # incompatible versions:
@@ -2920,6 +3048,58 @@ fi
 
 ac_config_headers="$ac_config_headers lib/Grid_config.h"
 
+# Check whether --enable-silent-rules was given.
+if test "${enable_silent_rules+set}" = set; then :
+  enableval=$enable_silent_rules;
+fi
+
+case $enable_silent_rules in # (((
+  yes) AM_DEFAULT_VERBOSITY=0;;
+   no) AM_DEFAULT_VERBOSITY=1;;
+    *) AM_DEFAULT_VERBOSITY=0;;
+esac
+am_make=${MAKE-make}
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $am_make supports nested variables" >&5
+$as_echo_n "checking whether $am_make supports nested variables... " >&6; }
+if ${am_cv_make_support_nested_variables+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if $as_echo 'TRUE=$(BAR$(V))
+BAR0=false
+BAR1=true
+V=1
+am__doit:
+	@$(TRUE)
+.PHONY: am__doit' | $am_make -f - >/dev/null 2>&1; then
+  am_cv_make_support_nested_variables=yes
+else
+  am_cv_make_support_nested_variables=no
+fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $am_cv_make_support_nested_variables" >&5
+$as_echo "$am_cv_make_support_nested_variables" >&6; }
+if test $am_cv_make_support_nested_variables = yes; then
+    AM_V='$(V)'
+  AM_DEFAULT_V='$(AM_DEFAULT_VERBOSITY)'
+else
+  AM_V=$AM_DEFAULT_VERBOSITY
+  AM_DEFAULT_V=$AM_DEFAULT_VERBOSITY
+fi
+AM_BACKSLASH='\'
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}:
+
+:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+Configuring $PACKAGE v$VERSION  for $host
+:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+" >&5
+$as_echo "$as_me:
+
+:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+Configuring $PACKAGE v$VERSION  for $host
+:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+" >&6;}
 
 # Checks for programs.
 ac_ext=cpp
@@ -4334,6 +4514,11 @@ fi
 done
 
 
+
+
+
+
+
 # Check whether --enable-simd was given.
 if test "${enable_simd+set}" = set; then :
   enableval=$enable_simd; \
@@ -5891,3 +6076,22 @@ if test -n "$ac_unrecognized_opts" && test "$enable_option_checking" != no; then
 $as_echo "$as_me: WARNING: unrecognized options: $ac_unrecognized_opts" >&2;}
 fi
 
+
+
+echo "
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Summary of configuration for $PACKAGE v$VERSION
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The following features are enabled:
+
+- architecture (build)          : $build_cpu
+- os (build)                    : $build_os
+- architecture (target)         : $target_cpu
+- os (target)                   : $target_os
+----------------------------------------------------------
+- enabled simd support          : ${ac_SIMD}
+- communications type           : ${ac_COMMS}
+
+
+"

configure.ac

@@ -1,9 +1,25 @@
+#                         -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
+#
+# Project Grid package  
+# 
+# Time-stamp: <2015-05-18 17:14:20 neo>
+
+AC_PREREQ([2.69])
 AC_INIT([Grid], [1.0], [paboyle@ph.ed.ac.uk])
+AC_CANONICAL_SYSTEM
 AM_INIT_AUTOMAKE(subdir-objects)
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_SRCDIR([lib/Grid.h])
 AC_CONFIG_HEADERS([lib/Grid_config.h])
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
+
+AC_MSG_NOTICE([
+
+:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+Configuring $PACKAGE v$VERSION  for $host
+:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+])
 
 # Checks for programs.
 AC_LANG(C++)
@@ -32,6 +48,11 @@ AC_TYPE_UINT64_T
 # Checks for library functions.
 AC_CHECK_FUNCS([gettimeofday])
 
+
+
+
+
+
 AC_ARG_ENABLE([simd],[AC_HELP_STRING([--enable-simd=SSE|AVX|AVX2|AVX512|MIC],\
 	[Select instructions to be SSE4.0, AVX 1.0, AVX 2.0+FMA, AVX 512, MIC])],\
 	[ac_SIMD=${enable_simd}],[ac_SIMD=AVX2])
@@ -84,3 +105,22 @@ AC_CONFIG_FILES(lib/Makefile)
 AC_CONFIG_FILES(tests/Makefile)
 AC_CONFIG_FILES(benchmarks/Makefile)
 AC_OUTPUT
+
+
+echo "
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Summary of configuration for $PACKAGE v$VERSION
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The following features are enabled:
+
+- architecture (build)          : $build_cpu
+- os (build)                    : $build_os
+- architecture (target)         : $target_cpu
+- os (target)                   : $target_os
+----------------------------------------------------------
+- enabled simd support          : ${ac_SIMD}
+- communications type           : ${ac_COMMS}
+
+
+"

lib/algorithms/approx/bigfloat.h

@@ -322,7 +322,7 @@ public:
 
   friend bigfloat abs_bf(const bigfloat& x){
     bigfloat a;
-    a.x=abs(x.x);
+    a.x=fabs(x.x);
     return a;
   }