Merge remote-tracking branch 'upstream/master'

2 files changed, 560 insertions, 124 deletions

diff --git a/m4/ax_pthread.m4 b/m4/ax_pthread.m4
new file mode 100644
index 00000000..d383ad5c
--- /dev/null
+++ b/m4/ax_pthread.m4
@@ -0,0 +1,332 @@
+# ===========================================================================
+#        http://www.gnu.org/software/autoconf-archive/ax_pthread.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
+#
+# DESCRIPTION
+#
+#   This macro figures out how to build C programs using POSIX threads. It
+#   sets the PTHREAD_LIBS output variable to the threads library and linker
+#   flags, and the PTHREAD_CFLAGS output variable to any special C compiler
+#   flags that are needed. (The user can also force certain compiler
+#   flags/libs to be tested by setting these environment variables.)
+#
+#   Also sets PTHREAD_CC to any special C compiler that is needed for
+#   multi-threaded programs (defaults to the value of CC otherwise). (This
+#   is necessary on AIX to use the special cc_r compiler alias.)
+#
+#   NOTE: You are assumed to not only compile your program with these flags,
+#   but also link it with them as well. e.g. you should link with
+#   $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
+#
+#   If you are only building threads programs, you may wish to use these
+#   variables in your default LIBS, CFLAGS, and CC:
+#
+#     LIBS="$PTHREAD_LIBS $LIBS"
+#     CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+#     CC="$PTHREAD_CC"
+#
+#   In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant
+#   has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to that name
+#   (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
+#
+#   Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the
+#   PTHREAD_PRIO_INHERIT symbol is defined when compiling with
+#   PTHREAD_CFLAGS.
+#
+#   ACTION-IF-FOUND is a list of shell commands to run if a threads library
+#   is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
+#   is not found. If ACTION-IF-FOUND is not specified, the default action
+#   will define HAVE_PTHREAD.
+#
+#   Please let the authors know if this macro fails on any platform, or if
+#   you have any other suggestions or comments. This macro was based on work
+#   by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help
+#   from M. Frigo), as well as ac_pthread and hb_pthread macros posted by
+#   Alejandro Forero Cuervo to the autoconf macro repository. We are also
+#   grateful for the helpful feedback of numerous users.
+#
+#   Updated for Autoconf 2.68 by Daniel Richard G.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
+#   Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG>
+#
+#   This program is free software: you can redistribute it and/or modify it
+#   under the terms of the GNU General Public License as published by the
+#   Free Software Foundation, either version 3 of the License, or (at your
+#   option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#   Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+#   As a special exception, the respective Autoconf Macro's copyright owner
+#   gives unlimited permission to copy, distribute and modify the configure
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
+
+#serial 21
+
+AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
+AC_DEFUN([AX_PTHREAD], [
+AC_REQUIRE([AC_CANONICAL_HOST])
+AC_LANG_PUSH([C])
+ax_pthread_ok=no
+
+# We used to check for pthread.h first, but this fails if pthread.h
+# requires special compiler flags (e.g. on True64 or Sequent).
+# It gets checked for in the link test anyway.
+
+# First of all, check if the user has set any of the PTHREAD_LIBS,
+# etcetera environment variables, and if threads linking works using
+# them:
+if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
+        save_CFLAGS="$CFLAGS"
+        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+        save_LIBS="$LIBS"
+        LIBS="$PTHREAD_LIBS $LIBS"
+        AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
+        AC_TRY_LINK_FUNC([pthread_join], [ax_pthread_ok=yes])
+        AC_MSG_RESULT([$ax_pthread_ok])
+        if test x"$ax_pthread_ok" = xno; then
+                PTHREAD_LIBS=""
+                PTHREAD_CFLAGS=""
+        fi
+        LIBS="$save_LIBS"
+        CFLAGS="$save_CFLAGS"
+fi
+
+# We must check for the threads library under a number of different
+# names; the ordering is very important because some systems
+# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
+# libraries is broken (non-POSIX).
+
+# Create a list of thread flags to try.  Items starting with a "-" are
+# C compiler flags, and other items are library names, except for "none"
+# which indicates that we try without any flags at all, and "pthread-config"
+# which is a program returning the flags for the Pth emulation library.
+
+ax_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
+
+# The ordering *is* (sometimes) important.  Some notes on the
+# individual items follow:
+
+# pthreads: AIX (must check this before -lpthread)
+# none: in case threads are in libc; should be tried before -Kthread and
+#       other compiler flags to prevent continual compiler warnings
+# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
+# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
+# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
+# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
+# -pthreads: Solaris/gcc
+# -mthreads: Mingw32/gcc, Lynx/gcc
+# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
+#      doesn't hurt to check since this sometimes defines pthreads too;
+#      also defines -D_REENTRANT)
+#      ... -mt is also the pthreads flag for HP/aCC
+# pthread: Linux, etcetera
+# --thread-safe: KAI C++
+# pthread-config: use pthread-config program (for GNU Pth library)
+
+case ${host_os} in
+        solaris*)
+
+        # On Solaris (at least, for some versions), libc contains stubbed
+        # (non-functional) versions of the pthreads routines, so link-based
+        # tests will erroneously succeed.  (We need to link with -pthreads/-mt/
+        # -lpthread.)  (The stubs are missing pthread_cleanup_push, or rather
+        # a function called by this macro, so we could check for that, but
+        # who knows whether they'll stub that too in a future libc.)  So,
+        # we'll just look for -pthreads and -lpthread first:
+
+        ax_pthread_flags="-pthreads pthread -mt -pthread $ax_pthread_flags"
+        ;;
+
+        darwin*)
+        ax_pthread_flags="-pthread $ax_pthread_flags"
+        ;;
+esac
+
+# Clang doesn't consider unrecognized options an error unless we specify
+# -Werror. We throw in some extra Clang-specific options to ensure that
+# this doesn't happen for GCC, which also accepts -Werror.
+
+AC_MSG_CHECKING([if compiler needs -Werror to reject unknown flags])
+save_CFLAGS="$CFLAGS"
+ax_pthread_extra_flags="-Werror"
+CFLAGS="$CFLAGS $ax_pthread_extra_flags -Wunknown-warning-option -Wsizeof-array-argument"
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([int foo(void);],[foo()])],
+                  [AC_MSG_RESULT([yes])],
+                  [ax_pthread_extra_flags=
+                   AC_MSG_RESULT([no])])
+CFLAGS="$save_CFLAGS"
+
+if test x"$ax_pthread_ok" = xno; then
+for flag in $ax_pthread_flags; do
+
+        case $flag in
+                none)
+                AC_MSG_CHECKING([whether pthreads work without any flags])
+                ;;
+
+                -*)
+                AC_MSG_CHECKING([whether pthreads work with $flag])
+                PTHREAD_CFLAGS="$flag"
+                ;;
+
+                pthread-config)
+                AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no])
+                if test x"$ax_pthread_config" = xno; then continue; fi
+                PTHREAD_CFLAGS="`pthread-config --cflags`"
+                PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
+                ;;
+
+                *)
+                AC_MSG_CHECKING([for the pthreads library -l$flag])
+                PTHREAD_LIBS="-l$flag"
+                ;;
+        esac
+
+        save_LIBS="$LIBS"
+        save_CFLAGS="$CFLAGS"
+        LIBS="$PTHREAD_LIBS $LIBS"
+        CFLAGS="$CFLAGS $PTHREAD_CFLAGS $ax_pthread_extra_flags"
+
+        # Check for various functions.  We must include pthread.h,
+        # since some functions may be macros.  (On the Sequent, we
+        # need a special flag -Kthread to make this header compile.)
+        # We check for pthread_join because it is in -lpthread on IRIX
+        # while pthread_create is in libc.  We check for pthread_attr_init
+        # due to DEC craziness with -lpthreads.  We check for
+        # pthread_cleanup_push because it is one of the few pthread
+        # functions on Solaris that doesn't have a non-functional libc stub.
+        # We try pthread_create on general principles.
+        AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
+                        static void routine(void *a) { a = 0; }
+                        static void *start_routine(void *a) { return a; }],
+                       [pthread_t th; pthread_attr_t attr;
+                        pthread_create(&th, 0, start_routine, 0);
+                        pthread_join(th, 0);
+                        pthread_attr_init(&attr);
+                        pthread_cleanup_push(routine, 0);
+                        pthread_cleanup_pop(0) /* ; */])],
+                [ax_pthread_ok=yes],
+                [])
+
+        LIBS="$save_LIBS"
+        CFLAGS="$save_CFLAGS"
+
+        AC_MSG_RESULT([$ax_pthread_ok])
+        if test "x$ax_pthread_ok" = xyes; then
+                break;
+        fi
+
+        PTHREAD_LIBS=""
+        PTHREAD_CFLAGS=""
+done
+fi
+
+# Various other checks:
+if test "x$ax_pthread_ok" = xyes; then
+        save_LIBS="$LIBS"
+        LIBS="$PTHREAD_LIBS $LIBS"
+        save_CFLAGS="$CFLAGS"
+        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
+
+        # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
+        AC_MSG_CHECKING([for joinable pthread attribute])
+        attr_name=unknown
+        for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
+            AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
+                           [int attr = $attr; return attr /* ; */])],
+                [attr_name=$attr; break],
+                [])
+        done
+        AC_MSG_RESULT([$attr_name])
+        if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
+            AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE], [$attr_name],
+                               [Define to necessary symbol if this constant
+                                uses a non-standard name on your system.])
+        fi
+
+        AC_MSG_CHECKING([if more special flags are required for pthreads])
+        flag=no
+        case ${host_os} in
+            aix* | freebsd* | darwin*) flag="-D_THREAD_SAFE";;
+            osf* | hpux*) flag="-D_REENTRANT";;
+            solaris*)
+            if test "$GCC" = "yes"; then
+                flag="-D_REENTRANT"
+            else
+                # TODO: What about Clang on Solaris?
+                flag="-mt -D_REENTRANT"
+            fi
+            ;;
+        esac
+        AC_MSG_RESULT([$flag])
+        if test "x$flag" != xno; then
+            PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
+        fi
+
+        AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
+            [ax_cv_PTHREAD_PRIO_INHERIT], [
+                AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
+                                                [[int i = PTHREAD_PRIO_INHERIT;]])],
+                    [ax_cv_PTHREAD_PRIO_INHERIT=yes],
+                    [ax_cv_PTHREAD_PRIO_INHERIT=no])
+            ])
+        AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes"],
+            [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])])
+
+        LIBS="$save_LIBS"
+        CFLAGS="$save_CFLAGS"
+
+        # More AIX lossage: compile with *_r variant
+        if test "x$GCC" != xyes; then
+            case $host_os in
+                aix*)
+                AS_CASE(["x/$CC"],
+                  [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6],
+                  [#handle absolute path differently from PATH based program lookup
+                   AS_CASE(["x$CC"],
+                     [x/*],
+                     [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])],
+                     [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
+                ;;
+            esac
+        fi
+fi
+
+test -n "$PTHREAD_CC" || PTHREAD_CC="$CC"
+
+AC_SUBST([PTHREAD_LIBS])
+AC_SUBST([PTHREAD_CFLAGS])
+AC_SUBST([PTHREAD_CC])
+
+# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
+if test x"$ax_pthread_ok" = xyes; then
+        ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1])
+        :
+else
+        ax_pthread_ok=no
+        $2
+fi
+AC_LANG_POP
+])dnl AX_PTHREAD
diff --git a/m4/boost.m4 b/m4/boost.m4
index c8eb65ae..11a623dc 100644
--- a/m4/boost.m4
+++ b/m4/boost.m4
@@ -1,5 +1,5 @@
 # boost.m4: Locate Boost headers and libraries for autoconf-based projects.
-# Copyright (C) 2007, 2008, 2009, 2010, 2011  Benoit Sigoure <tsuna@lrde.epita.fr>
+# Copyright (C) 2007-2011, 2014  Benoit Sigoure <tsuna@lrde.epita.fr>
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -22,7 +22,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 m4_define([_BOOST_SERIAL], [m4_translit([
-# serial 18
+# serial 23
 ], [#
 ], [])])
 
@@ -59,7 +59,8 @@ m4_pattern_forbid([^_?(BOOST|Boost)_])
 # It could be useful to turn this into a macro which extracts the
 # value of any macro.
 m4_define([_BOOST_SED_CPP],
-[AC_LANG_PREPROC_REQUIRE()dnl
+[AC_LANG_PUSH([C++])dnl
+AC_LANG_PREPROC_REQUIRE()dnl
 AC_REQUIRE([AC_PROG_SED])dnl
 AC_LANG_CONFTEST([AC_LANG_SOURCE([[$2]])])
 AS_IF([dnl eval is necessary to expand ac_cpp.
@@ -77,7 +78,8 @@ dnl Cannot use 'dnl' after [$4] because a trailing dnl may break AC_CACHE_CHECK
   [$3],
   [$4])
 rm -rf conftest*
-])# AC_EGREP_CPP
+AC_LANG_POP([C++])dnl
+])# _BOOST_SED_CPP
 
 
 
@@ -221,6 +223,7 @@ fi
 CPPFLAGS=$boost_save_CPPFLAGS
 ])# BOOST_REQUIRE
 
+
 # BOOST_STATIC()
 # --------------
 # Add the "--enable-static-boost" configure argument. If this argument is given
@@ -232,6 +235,7 @@ AC_DEFUN([BOOST_STATIC],
      [enable_static_boost=yes],
      [enable_static_boost=no])])# BOOST_STATIC
 
+
 # BOOST_FIND_HEADER([HEADER-NAME], [ACTION-IF-NOT-FOUND], [ACTION-IF-FOUND])
 # --------------------------------------------------------------------------
 # Wrapper around AC_CHECK_HEADER for Boost headers.  Useful to check for
@@ -264,14 +268,16 @@ fi
 ])# BOOST_FIND_HEADER
 
 
-# BOOST_FIND_LIB([LIB-NAME], [PREFERRED-RT-OPT], [HEADER-NAME], [CXX-TEST],
-#                [CXX-PROLOGUE])
-# -------------------------------------------------------------------------
-# Look for the Boost library LIB-NAME (e.g., LIB-NAME = `thread', for
-# libboost_thread).  Check that HEADER-NAME works and check that
-# libboost_LIB-NAME can link with the code CXX-TEST.  The optional argument
-# CXX-PROLOGUE can be used to include some C++ code before the `main'
-# function.
+# BOOST_FIND_LIBS([COMPONENT-NAME], [CANDIDATE-LIB-NAMES],
+#                 [PREFERRED-RT-OPT], [HEADER-NAME], [CXX-TEST],
+#                 [CXX-PROLOGUE])
+# --------------------------------------------------------------
+# Look for the Boost library COMPONENT-NAME (e.g., `thread', for
+# libboost_thread) under the possible CANDIDATE-LIB-NAMES (e.g.,
+# "thread_win32 thread").  Check that HEADER-NAME works and check that
+# libboost_LIB-NAME can link with the code CXX-TEST.  The optional
+# argument CXX-PROLOGUE can be used to include some C++ code before
+# the `main' function.
 #
 # Invokes BOOST_FIND_HEADER([HEADER-NAME]) (see above).
 #
@@ -285,7 +291,7 @@ fi
 # builds.  Some sample values for PREFERRED-RT-OPT: (nothing), mt, d, mt-d, gdp
 # ...  If you want to make sure you have a specific version of Boost
 # (eg, >= 1.33) you *must* invoke BOOST_REQUIRE before this macro.
-AC_DEFUN([BOOST_FIND_LIB],
+AC_DEFUN([BOOST_FIND_LIBS],
 [AC_REQUIRE([BOOST_REQUIRE])dnl
 AC_REQUIRE([_BOOST_FIND_COMPILER_TAG])dnl
 AC_REQUIRE([BOOST_STATIC])dnl
@@ -299,32 +305,69 @@ AS_VAR_PUSHDEF([Boost_lib], [boost_cv_lib_$1])dnl
 AS_VAR_PUSHDEF([Boost_lib_LDFLAGS], [boost_cv_lib_$1_LDFLAGS])dnl
 AS_VAR_PUSHDEF([Boost_lib_LDPATH], [boost_cv_lib_$1_LDPATH])dnl
 AS_VAR_PUSHDEF([Boost_lib_LIBS], [boost_cv_lib_$1_LIBS])dnl
-BOOST_FIND_HEADER([$3])
+BOOST_FIND_HEADER([$4])
 boost_save_CPPFLAGS=$CPPFLAGS
 CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
-# Now let's try to find the library.  The algorithm is as follows: first look
-# for a given library name according to the user's PREFERRED-RT-OPT.  For each
-# library name, we prefer to use the ones that carry the tag (toolset name).
-# Each library is searched through the various standard paths were Boost is
-# usually installed.  If we can't find the standard variants, we try to
-# enforce -mt (for instance on MacOSX, libboost_threads.dylib doesn't exist
-# but there's -obviously- libboost_threads-mt.dylib).
 AC_CACHE_CHECK([for the Boost $1 library], [Boost_lib],
-  [Boost_lib=no
-  case "$2" in #(
-    mt | mt-) boost_mt=-mt; boost_rtopt=;; #(
-    mt* | mt-*) boost_mt=-mt; boost_rtopt=`expr "X$2" : 'Xmt-*\(.*\)'`;; #(
-    *) boost_mt=; boost_rtopt=$2;;
+               [_BOOST_FIND_LIBS($@)])
+case $Boost_lib in #(
+  (no) _AC_MSG_LOG_CONFTEST
+    AC_MSG_ERROR([cannot find the flags to link with Boost $1])
+    ;;
+esac
+AC_SUBST(AS_TR_CPP([BOOST_$1_LDFLAGS]), [$Boost_lib_LDFLAGS])dnl
+AC_SUBST(AS_TR_CPP([BOOST_$1_LDPATH]), [$Boost_lib_LDPATH])dnl
+AC_SUBST([BOOST_LDPATH], [$Boost_lib_LDPATH])dnl
+AC_SUBST(AS_TR_CPP([BOOST_$1_LIBS]), [$Boost_lib_LIBS])dnl
+CPPFLAGS=$boost_save_CPPFLAGS
+AS_VAR_POPDEF([Boost_lib])dnl
+AS_VAR_POPDEF([Boost_lib_LDFLAGS])dnl
+AS_VAR_POPDEF([Boost_lib_LDPATH])dnl
+AS_VAR_POPDEF([Boost_lib_LIBS])dnl
+AC_LANG_POP([C++])dnl
+fi
+])
+
+
+# BOOST_FIND_LIB([LIB-NAME],
+#                [PREFERRED-RT-OPT], [HEADER-NAME], [CXX-TEST],
+#                [CXX-PROLOGUE])
+# --------------------------------------------------------------
+# Backward compatibility wrapper for BOOST_FIND_LIBS.
+AC_DEFUN([BOOST_FIND_LIB],
+[BOOST_FIND_LIBS([$1], $@)])
+
+
+# _BOOST_FIND_LIBS([LIB-NAME], [CANDIDATE-LIB-NAMES],
+#                 [PREFERRED-RT-OPT], [HEADER-NAME], [CXX-TEST],
+#                 [CXX-PROLOGUE])
+# --------------------------------------------------------------
+# Real implementation of BOOST_FIND_LIBS: rely on these local macros:
+# Boost_lib, Boost_lib_LDFLAGS, Boost_lib_LDPATH, Boost_lib_LIBS
+#
+# The algorithm is as follows: first look for a given library name
+# according to the user's PREFERRED-RT-OPT.  For each library name, we
+# prefer to use the ones that carry the tag (toolset name).  Each
+# library is searched through the various standard paths were Boost is
+# usually installed.  If we can't find the standard variants, we try
+# to enforce -mt (for instance on MacOSX, libboost_thread.dylib
+# doesn't exist but there's -obviously- libboost_thread-mt.dylib).
+AC_DEFUN([_BOOST_FIND_LIBS],
+[Boost_lib=no
+  case "$3" in #(
+    (mt | mt-) boost_mt=-mt; boost_rtopt=;; #(
+    (mt* | mt-*) boost_mt=-mt; boost_rtopt=`expr "X$3" : 'Xmt-*\(.*\)'`;; #(
+    (*) boost_mt=; boost_rtopt=$3;;
   esac
   if test $enable_static_boost = yes; then
     boost_rtopt="s$boost_rtopt"
   fi
   # Find the proper debug variant depending on what we've been asked to find.
   case $boost_rtopt in #(
-    *d*) boost_rt_d=$boost_rtopt;; #(
-    *[[sgpn]]*) # Insert the `d' at the right place (in between `sg' and `pn')
+    (*d*) boost_rt_d=$boost_rtopt;; #(
+    (*[[sgpn]]*) # Insert the `d' at the right place (in between `sg' and `pn')
       boost_rt_d=`echo "$boost_rtopt" | sed 's/\(s*g*\)\(p*n*\)/\1\2/'`;; #(
-    *) boost_rt_d='-d';;
+    (*) boost_rt_d='-d';;
   esac
   # If the PREFERRED-RT-OPT are not empty, prepend a `-'.
   test -n "$boost_rtopt" && boost_rtopt="-$boost_rtopt"
@@ -335,8 +378,8 @@ AC_CACHE_CHECK([for the Boost $1 library], [Boost_lib],
     AC_MSG_ERROR([the libext variable is empty, did you invoke Libtool?])
   boost_save_ac_objext=$ac_objext
   # Generate the test file.
-  AC_LANG_CONFTEST([AC_LANG_PROGRAM([#include <$3>
-$5], [$4])])
+  AC_LANG_CONFTEST([AC_LANG_PROGRAM([#include <$4>
+$6], [$5])])
 dnl Optimization hacks: compiling C++ is slow, especially with Boost.  What
 dnl we're trying to do here is guess the right combination of link flags
 dnl (LIBS / LDFLAGS) to use a given library.  This can take several
@@ -358,21 +401,22 @@ dnl start the for loops).
     [AC_MSG_ERROR([cannot compile a test that uses Boost $1])])
   ac_objext=$boost_save_ac_objext
   boost_failed_libs=
-# Don't bother to ident the 6 nested for loops, only the 2 innermost ones
-# matter.
+# Don't bother to ident the following nested for loops, only the 2
+# innermost ones matter.
+for boost_lib_ in $2; do
 for boost_tag_ in -$boost_cv_lib_tag ''; do
 for boost_ver_ in -$boost_cv_lib_version ''; do
 for boost_mt_ in $boost_mt -mt ''; do
 for boost_rtopt_ in $boost_rtopt '' -d; do
   for boost_lib in \
-    boost_$1$boost_tag_$boost_mt_$boost_rtopt_$boost_ver_ \
-    boost_$1$boost_tag_$boost_rtopt_$boost_ver_ \
-    boost_$1$boost_tag_$boost_mt_$boost_ver_ \
-    boost_$1$boost_tag_$boost_ver_
+    boost_$boost_lib_$boost_tag_$boost_mt_$boost_rtopt_$boost_ver_ \
+    boost_$boost_lib_$boost_tag_$boost_rtopt_$boost_ver_ \
+    boost_$boost_lib_$boost_tag_$boost_mt_$boost_ver_ \
+    boost_$boost_lib_$boost_tag_$boost_ver_
   do
     # Avoid testing twice the same lib
     case $boost_failed_libs in #(
-      *@$boost_lib@*) continue;;
+      (*@$boost_lib@*) continue;;
     esac
     # If with_boost is empty, we'll search in /lib first, which is not quite
     # right so instead we'll try to a location based on where the headers are.
@@ -382,14 +426,17 @@ for boost_rtopt_ in $boost_rtopt '' -d; do
              /opt/local/lib* /usr/local/lib* /opt/lib* /usr/lib* \
              "$with_boost" C:/Boost/lib /lib*
     do
-      test -e "$boost_ldpath" || continue
+      # Don't waste time with directories that don't exist.
+      if test x"$boost_ldpath" != x && test ! -e "$boost_ldpath"; then
+        continue
+      fi
       boost_save_LDFLAGS=$LDFLAGS
       # Are we looking for a static library?
       case $boost_ldpath:$boost_rtopt_ in #(
-        *?*:*s*) # Yes (Non empty boost_ldpath + s in rt opt)
+        (*?*:*s*) # Yes (Non empty boost_ldpath + s in rt opt)
           Boost_lib_LIBS="$boost_ldpath/lib$boost_lib.$libext"
           test -e "$Boost_lib_LIBS" || continue;; #(
-        *) # No: use -lboost_foo to find the shared library.
+        (*) # No: use -lboost_foo to find the shared library.
           Boost_lib_LIBS="-l$boost_lib";;
       esac
       boost_save_LIBS=$LIBS
@@ -403,27 +450,35 @@ dnl generated only once above (before we start the for loops).
       LDFLAGS=$boost_save_LDFLAGS
       LIBS=$boost_save_LIBS
       if test x"$Boost_lib" = xyes; then
-        # Check or used cached result of whether or not using -R or -rpath makes sense.
-        # Some implementations of ld, such as for Mac OSX, require -rpath but
-        # -R is the flag known to work on other systems.
-        # https://github.com/tsuna/boost.m4/issues/19
+        # Check or used cached result of whether or not using -R or
+        # -rpath makes sense.  Some implementations of ld, such as for
+        # Mac OSX, require -rpath but -R is the flag known to work on
+        # other systems.  https://github.com/tsuna/boost.m4/issues/19
         AC_CACHE_VAL([boost_cv_rpath_link_ldflag],
-          [for boost_cv_rpath_link_ldflag in -Wl,-R, -Wl,-rpath,; do
-            LDFLAGS="$boost_save_LDFLAGS -L$boost_ldpath $boost_cv_rpath_link_ldflag$boost_ldpath"
-            LIBS="$boost_save_LIBS $Boost_lib_LIBS"
-            _BOOST_AC_LINK_IFELSE([],
-              [boost_rpath_link_ldflag_found=yes
-              break],
-              [boost_rpath_link_ldflag_found=no])
-          done
+          [case $boost_ldpath in
+           '') # Nothing to do.
+             boost_cv_rpath_link_ldflag=
+             boost_rpath_link_ldflag_found=yes;;
+           *)
+            for boost_cv_rpath_link_ldflag in -Wl,-R, -Wl,-rpath,; do
+              LDFLAGS="$boost_save_LDFLAGS -L$boost_ldpath $boost_cv_rpath_link_ldflag$boost_ldpath"
+              LIBS="$boost_save_LIBS $Boost_lib_LIBS"
+              _BOOST_AC_LINK_IFELSE([],
+                [boost_rpath_link_ldflag_found=yes
+                break],
+                [boost_rpath_link_ldflag_found=no])
+            done
+            ;;
+          esac
           AS_IF([test "x$boost_rpath_link_ldflag_found" != "xyes"],
             [AC_MSG_ERROR([Unable to determine whether to use -R or -rpath])])
           LDFLAGS=$boost_save_LDFLAGS
           LIBS=$boost_save_LIBS
           ])
-        Boost_lib_LDFLAGS="-L$boost_ldpath $boost_cv_rpath_link_ldflag$boost_ldpath"
+        test x"$boost_ldpath" != x &&
+          Boost_lib_LDFLAGS="-L$boost_ldpath $boost_cv_rpath_link_ldflag$boost_ldpath"
         Boost_lib_LDPATH="$boost_ldpath"
-        break 6
+        break 7
       else
         boost_failed_libs="$boost_failed_libs@$boost_lib@"
       fi
@@ -433,25 +488,10 @@ done
 done
 done
 done
+done # boost_lib_
 rm -f conftest.$ac_objext
 ])
-case $Boost_lib in #(
-  no) _AC_MSG_LOG_CONFTEST
-    AC_MSG_ERROR([cannot find the flags to link with Boost $1])
-    ;;
-esac
-AC_SUBST(AS_TR_CPP([BOOST_$1_LDFLAGS]), [$Boost_lib_LDFLAGS])dnl
-AC_SUBST(AS_TR_CPP([BOOST_$1_LDPATH]), [$Boost_lib_LDPATH])dnl
-AC_SUBST([BOOST_LDPATH], [$Boost_lib_LDPATH])dnl
-AC_SUBST(AS_TR_CPP([BOOST_$1_LIBS]), [$Boost_lib_LIBS])dnl
-CPPFLAGS=$boost_save_CPPFLAGS
-AS_VAR_POPDEF([Boost_lib])dnl
-AS_VAR_POPDEF([Boost_lib_LDFLAGS])dnl
-AS_VAR_POPDEF([Boost_lib_LDPATH])dnl
-AS_VAR_POPDEF([Boost_lib_LIBS])dnl
-AC_LANG_POP([C++])dnl
-fi
-])# BOOST_FIND_LIB
+
 
 
 # --------------------------------------- #
@@ -493,20 +533,20 @@ BOOST_FIND_HEADER([boost/asio.hpp])])
 
 # BOOST_BIND()
 # ------------
-# Look for Boost.Bind
+# Look for Boost.Bind.
 BOOST_DEFUN([Bind],
 [BOOST_FIND_HEADER([boost/bind.hpp])])
 
 
 # BOOST_CHRONO()
-# ------------------
-# Look for Boost.Chrono
+# --------------
+# Look for Boost.Chrono.
 BOOST_DEFUN([Chrono],
 [# Do we have to check for Boost.System?  This link-time dependency was
 # added as of 1.35.0.  If we have a version <1.35, we must not attempt to
 # find Boost.System as it didn't exist by then.
 if test $boost_major_version -ge 135; then
-BOOST_SYSTEM([$1])
+  BOOST_SYSTEM([$1])
 fi # end of the Boost.System check.
 boost_filesystem_save_LIBS=$LIBS
 boost_filesystem_save_LDFLAGS=$LDFLAGS
@@ -517,11 +557,10 @@ BOOST_FIND_LIB([chrono], [$1],
                 [boost/chrono.hpp],
                 [boost::chrono::thread_clock d;])
 if test $enable_static_boost = yes && test $boost_major_version -ge 135; then
-    AC_SUBST([BOOST_FILESYSTEM_LIBS], ["$BOOST_FILESYSTEM_LIBS $BOOST_SYSTEM_LIBS"])
+  BOOST_FILESYSTEM_LIBS="$BOOST_FILESYSTEM_LIBS $BOOST_SYSTEM_LIBS"
 fi
 LIBS=$boost_filesystem_save_LIBS
 LDFLAGS=$boost_filesystem_save_LDFLAGS
-
 ])# BOOST_CHRONO
 
 
@@ -564,7 +603,7 @@ BOOST_DEFUN([Filesystem],
 # added as of 1.35.0.  If we have a version <1.35, we must not attempt to
 # find Boost.System as it didn't exist by then.
 if test $boost_major_version -ge 135; then
-BOOST_SYSTEM([$1])
+  BOOST_SYSTEM([$1])
 fi # end of the Boost.System check.
 boost_filesystem_save_LIBS=$LIBS
 boost_filesystem_save_LDFLAGS=$LDFLAGS
@@ -574,23 +613,34 @@ LDFLAGS="$LDFLAGS $BOOST_SYSTEM_LDFLAGS"
 BOOST_FIND_LIB([filesystem], [$1],
                 [boost/filesystem/path.hpp], [boost::filesystem::path p;])
 if test $enable_static_boost = yes && test $boost_major_version -ge 135; then
-    AC_SUBST([BOOST_FILESYSTEM_LIBS], ["$BOOST_FILESYSTEM_LIBS $BOOST_SYSTEM_LIBS"])
+  BOOST_FILESYSTEM_LIBS="$BOOST_FILESYSTEM_LIBS $BOOST_SYSTEM_LIBS"
 fi
 LIBS=$boost_filesystem_save_LIBS
 LDFLAGS=$boost_filesystem_save_LDFLAGS
 ])# BOOST_FILESYSTEM
 
 
+# BOOST_FLYWEIGHT()
+# -----------------
+# Look for Boost.Flyweight.
+BOOST_DEFUN([Flyweight],
+[dnl There's a hidden dependency on pthreads.
+AC_REQUIRE([_BOOST_PTHREAD_FLAG])dnl
+BOOST_FIND_HEADER([boost/flyweight.hpp])
+AC_SUBST([BOOST_FLYWEIGHT_LIBS], [$boost_cv_pthread_flag])
+])
+
+
 # BOOST_FOREACH()
 # ---------------
-# Look for Boost.Foreach
+# Look for Boost.Foreach.
 BOOST_DEFUN([Foreach],
 [BOOST_FIND_HEADER([boost/foreach.hpp])])
 
 
 # BOOST_FORMAT()
 # --------------
-# Look for Boost.Format
+# Look for Boost.Format.
 # Note: we can't check for boost/format/format_fwd.hpp because the header isn't
 # standalone.  It can't be compiled because it triggers the following error:
 # boost/format/detail/config_macros.hpp:88: error: 'locale' in namespace 'std'
@@ -651,7 +701,7 @@ BOOST_DEFUN([Lambda],
 
 # BOOST_LOG([PREFERRED-RT-OPT])
 # -----------------------------
-# Look for Boost.Log For the documentation of PREFERRED-RT-OPT, see the
+# Look for Boost.Log.  For the documentation of PREFERRED-RT-OPT, see the
 # documentation of BOOST_FIND_LIB above.
 BOOST_DEFUN([Log],
 [BOOST_FIND_LIB([log], [$1],
@@ -662,12 +712,12 @@ BOOST_DEFUN([Log],
 
 # BOOST_LOG_SETUP([PREFERRED-RT-OPT])
 # -----------------------------------
-# Look for Boost.Log For the documentation of PREFERRED-RT-OPT, see the
+# Look for Boost.Log.  For the documentation of PREFERRED-RT-OPT, see the
 # documentation of BOOST_FIND_LIB above.
 BOOST_DEFUN([Log_Setup],
 [AC_REQUIRE([BOOST_LOG])dnl
 BOOST_FIND_LIB([log_setup], [$1],
-    [boost/log/utility/init/from_settings.hpp],
+    [boost/log/utility/setup/from_settings.hpp],
     [boost::log::basic_settings<char> bs; bs.empty();])
 ])# BOOST_LOG_SETUP
 
@@ -684,6 +734,29 @@ BOOST_DEFUN([Math],
 [BOOST_FIND_HEADER([boost/math/special_functions.hpp])])
 
 
+# BOOST_MPI([PREFERRED-RT-OPT])
+# -------------------------------
+# Look for Boost MPI.  For the documentation of PREFERRED-RT-OPT, see the
+# documentation of BOOST_FIND_LIB above.  Uses MPICXX variable if it is
+# set, otherwise tries CXX
+#
+BOOST_DEFUN([MPI],
+[boost_save_CXX=${CXX}
+boost_save_CXXCPP=${CXXCPP}
+if test x"${MPICXX}" != x; then
+  CXX=${MPICXX}
+  CXXCPP="${MPICXX} -E"
+fi
+BOOST_FIND_LIB([mpi], [$1],
+               [boost/mpi.hpp],
+               [int argc = 0;
+                char **argv = 0;
+                boost::mpi::environment env(argc,argv);])
+CXX=${boost_save_CXX}
+CXXCPP=${boost_save_CXXCPP}
+])# BOOST_MPI
+
+
 # BOOST_MULTIARRAY()
 # ------------------
 # Look for Boost.MultiArray
@@ -691,6 +764,14 @@ BOOST_DEFUN([MultiArray],
 [BOOST_FIND_HEADER([boost/multi_array.hpp])])
 
 
+# BOOST_NUMERIC_UBLAS()
+# --------------------------
+# Look for Boost.NumericUblas (Basic Linear Algebra)
+BOOST_DEFUN([Numeric_Ublas],
+[BOOST_FIND_HEADER([boost/numeric/ublas/vector.hpp])
+])# BOOST_NUMERIC_UBLAS
+
+
 # BOOST_NUMERIC_CONVERSION()
 # --------------------------
 # Look for Boost.NumericConversion (policy-based numeric conversion)
@@ -759,9 +840,9 @@ BOOST_DEFUN([Python],
 _BOOST_PYTHON_CONFIG([LDFLAGS],   [ldflags])
 _BOOST_PYTHON_CONFIG([LIBS],      [libs])
 m4_pattern_allow([^BOOST_PYTHON_MODULE$])dnl
-BOOST_FIND_LIB([python], [$1],
-               [boost/python.hpp],
-               [], [BOOST_PYTHON_MODULE(empty) {}])
+BOOST_FIND_LIBS([python], [python python3], [$1],
+                [boost/python.hpp],
+                [], [BOOST_PYTHON_MODULE(empty) {}])
 CPPFLAGS=$boost_python_save_CPPFLAGS
 LDFLAGS=$boost_python_save_LDFLAGS
 LIBS=$boost_python_save_LIBS
@@ -867,19 +948,18 @@ BOOST_FIND_LIB([unit_test_framework], [$1],
 ])# BOOST_TEST
 
 
-# BOOST_THREADS([PREFERRED-RT-OPT])
+# BOOST_THREAD([PREFERRED-RT-OPT])
 # ---------------------------------
 # Look for Boost.Thread.  For the documentation of PREFERRED-RT-OPT, see the
 # documentation of BOOST_FIND_LIB above.
-# FIXME: Provide an alias "BOOST_THREAD".
-BOOST_DEFUN([Threads],
+BOOST_DEFUN([Thread],
 [dnl Having the pthread flag is required at least on GCC3 where
 dnl boost/thread.hpp would complain if we try to compile without
 dnl -pthread on GNU/Linux.
 AC_REQUIRE([_BOOST_PTHREAD_FLAG])dnl
-boost_threads_save_LIBS=$LIBS
-boost_threads_save_LDFLAGS=$LDFLAGS
-boost_threads_save_CPPFLAGS=$CPPFLAGS
+boost_thread_save_LIBS=$LIBS
+boost_thread_save_LDFLAGS=$LDFLAGS
+boost_thread_save_CPPFLAGS=$CPPFLAGS
 # Link-time dependency from thread to system was added as of 1.49.0.
 if test $boost_major_version -ge 149; then
 BOOST_SYSTEM([$1])
@@ -887,36 +967,26 @@ fi # end of the Boost.System check.
 m4_pattern_allow([^BOOST_SYSTEM_(LIBS|LDFLAGS)$])dnl
 LIBS="$LIBS $BOOST_SYSTEM_LIBS $boost_cv_pthread_flag"
 LDFLAGS="$LDFLAGS $BOOST_SYSTEM_LDFLAGS"
-# Yes, we *need* to put the -pthread thing in CPPFLAGS because with GCC3,
-# boost/thread.hpp will trigger a #error if -pthread isn't used:
-#   boost/config/requires_threads.hpp:47:5: #error "Compiler threading support
-#   is not turned on. Please set the correct command line options for
-#   threading: -pthread (Linux), -pthreads (Solaris) or -mthreads (Mingw32)"
 CPPFLAGS="$CPPFLAGS $boost_cv_pthread_flag"
 
 # When compiling for the Windows platform, the threads library is named
 # differently.
 case $host_os in
-  (*mingw*)
-    BOOST_FIND_LIB([thread_win32], [$1],
-                   [boost/thread.hpp], [boost::thread t; boost::mutex m;])
-    BOOST_THREAD_LDFLAGS=$BOOST_THREAD_WIN32_LDFLAGS
-    BOOST_THREAD_LDPATH=$BOOST_THREAD_WIN32_LDPATH
-    BOOST_THREAD_LIBS=$BOOST_THREAD_WIN32_LIBS
-  ;;
-  (*)
-    BOOST_FIND_LIB([thread], [$1],
-                   [boost/thread.hpp], [boost::thread t; boost::mutex m;])
-  ;;
+  (*mingw*) boost_thread_lib_ext=_win32;;
 esac
+BOOST_FIND_LIBS([thread], [thread$boost_thread_lib_ext],
+                [$1],
+                [boost/thread.hpp], [boost::thread t; boost::mutex m;])
 
 BOOST_THREAD_LIBS="$BOOST_THREAD_LIBS $BOOST_SYSTEM_LIBS $boost_cv_pthread_flag"
 BOOST_THREAD_LDFLAGS="$BOOST_SYSTEM_LDFLAGS"
 BOOST_CPPFLAGS="$BOOST_CPPFLAGS $boost_cv_pthread_flag"
-LIBS=$boost_threads_save_LIBS
-LDFLAGS=$boost_threads_save_LDFLAGS
-CPPFLAGS=$boost_threads_save_CPPFLAGS
-])# BOOST_THREADS
+LIBS=$boost_thread_save_LIBS
+LDFLAGS=$boost_thread_save_LDFLAGS
+CPPFLAGS=$boost_thread_save_CPPFLAGS
+])# BOOST_THREAD
+
+AU_ALIAS([BOOST_THREADS], [BOOST_THREAD])
 
 
 # BOOST_TOKENIZER()
@@ -964,7 +1034,8 @@ BOOST_DEFUN([Variant],
 [BOOST_FIND_HEADER([boost/variant/variant_fwd.hpp])
 BOOST_FIND_HEADER([boost/variant.hpp])])
 
-# BOOST_POINTERCONTAINER()
+
+# BOOST_POINTER_CONTAINER()
 # ------------------------
 # Look for Boost.PointerContainer
 BOOST_DEFUN([Pointer_Container],
@@ -974,12 +1045,13 @@ BOOST_FIND_HEADER([boost/ptr_container/ptr_vector.hpp])
 BOOST_FIND_HEADER([boost/ptr_container/ptr_array.hpp])
 BOOST_FIND_HEADER([boost/ptr_container/ptr_set.hpp])
 BOOST_FIND_HEADER([boost/ptr_container/ptr_map.hpp])
-])# BOOST_POINTERCONTAINER
+])# BOOST_POINTER_CONTAINER
+
 
 # BOOST_WAVE([PREFERRED-RT-OPT])
 # ------------------------------
 # NOTE: If you intend to use Wave/Spirit with thread support, make sure you
-# call BOOST_THREADS first.
+# call BOOST_THREAD first.
 # Look for Boost.Wave.  For the documentation of PREFERRED-RT-OPT, see the
 # documentation of BOOST_FIND_LIB above.
 BOOST_DEFUN([Wave],
@@ -1014,8 +1086,16 @@ BOOST_DEFUN([Xpressive],
 
 # _BOOST_PTHREAD_FLAG()
 # ---------------------
-# Internal helper for BOOST_THREADS.  Based on ACX_PTHREAD:
-# http://autoconf-archive.cryp.to/acx_pthread.html
+# Internal helper for BOOST_THREAD.  Computes boost_cv_pthread_flag
+# which must be used in CPPFLAGS and LIBS.
+#
+# Yes, we *need* to put the -pthread thing in CPPFLAGS because with GCC3,
+# boost/thread.hpp will trigger a #error if -pthread isn't used:
+#   boost/config/requires_threads.hpp:47:5: #error "Compiler threading support
+#   is not turned on. Please set the correct command line options for
+#   threading: -pthread (Linux), -pthreads (Solaris) or -mthreads (Mingw32)"
+#
+# Based on ACX_PTHREAD: http://autoconf-archive.cryp.to/acx_pthread.html
 AC_DEFUN([_BOOST_PTHREAD_FLAG],
 [AC_REQUIRE([AC_PROG_CXX])dnl
 AC_REQUIRE([AC_CANONICAL_HOST])dnl
@@ -1083,6 +1163,14 @@ AC_LANG_POP([C++])dnl
 m4_define([_BOOST_gcc_test],
 ["defined __GNUC__ && __GNUC__ == $1 && __GNUC_MINOR__ == $2 && !defined __ICC @ gcc$1$2"])dnl
 
+# _BOOST_mingw_test(MAJOR, MINOR)
+# -----------------------------
+# Internal helper for _BOOST_FIND_COMPILER_TAG.
+m4_define([_BOOST_mingw_test],
+["defined __GNUC__ && __GNUC__ == $1 && __GNUC_MINOR__ == $2 && !defined __ICC && \
+  (defined WIN32 || defined WINNT || defined _WIN32 || defined __WIN32 \
+         || defined __WIN32__ || defined __WINNT || defined __WINNT__) @ mgw$1$2"])dnl
+
 
 # _BOOST_FIND_COMPILER_TAG()
 # --------------------------
@@ -1092,7 +1180,8 @@ m4_define([_BOOST_gcc_test],
 AC_DEFUN([_BOOST_FIND_COMPILER_TAG],
 [AC_REQUIRE([AC_PROG_CXX])dnl
 AC_REQUIRE([AC_CANONICAL_HOST])dnl
-AC_CACHE_CHECK([for the toolset name used by Boost for $CXX], [boost_cv_lib_tag],
+AC_CACHE_CHECK([for the toolset name used by Boost for $CXX],
+               [boost_cv_lib_tag],
 [boost_cv_lib_tag=unknown
 if test x$boost_cv_inc_path != xno; then
   AC_LANG_PUSH([C++])dnl
@@ -1110,14 +1199,27 @@ if test x$boost_cv_inc_path != xno; then
   # I'm not sure about my test for `il' (be careful: Intel's ICC pre-defines
   # the same defines as GCC's).
   for i in \
+    _BOOST_mingw_test(4, 10) \
+    _BOOST_gcc_test(4, 10) \
+    _BOOST_mingw_test(4, 9) \
+    _BOOST_gcc_test(4, 9) \
+    _BOOST_mingw_test(4, 8) \
     _BOOST_gcc_test(4, 8) \
+    _BOOST_mingw_test(4, 7) \
     _BOOST_gcc_test(4, 7) \
+    _BOOST_mingw_test(4, 6) \
     _BOOST_gcc_test(4, 6) \
+    _BOOST_mingw_test(4, 5) \
     _BOOST_gcc_test(4, 5) \
+    _BOOST_mingw_test(4, 4) \
     _BOOST_gcc_test(4, 4) \
+    _BOOST_mingw_test(4, 3) \
     _BOOST_gcc_test(4, 3) \
+    _BOOST_mingw_test(4, 2) \
     _BOOST_gcc_test(4, 2) \
+    _BOOST_mingw_test(4, 1) \
     _BOOST_gcc_test(4, 1) \
+    _BOOST_mingw_test(4, 0) \
     _BOOST_gcc_test(4, 0) \
     "defined __GNUC__ && __GNUC__ == 3 && !defined __ICC \
      && (defined WIN32 || defined WINNT || defined _WIN32 || defined __WIN32 \
@@ -1183,6 +1285,7 @@ fi])dnl end of AC_CACHE_CHECK
 # Thread) flavors of Boost.  Sets boost_guess_use_mt accordingly.
 AC_DEFUN([_BOOST_GUESS_WHETHER_TO_USE_MT],
 [# Check whether we do better use `mt' even though we weren't ask to.
+AC_LANG_PUSH([C++])dnl
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 #if defined _REENTRANT || defined _MT || defined __MT__
 /* use -mt */
@@ -1190,6 +1293,7 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
 # error MT not needed
 #endif
 ]])], [boost_guess_use_mt=:], [boost_guess_use_mt=false])
+AC_LANG_POP([C++])dnl
 ])
 
 # _BOOST_AC_LINK_IFELSE(PROGRAM, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
@@ -1213,11 +1317,11 @@ boost_use_source=:
 test -f conftest.$ac_objext && ac_ext=$ac_objext && boost_use_source=false &&
   _AS_ECHO_LOG([re-using the existing conftest.$ac_objext])
 AS_IF([_AC_DO_STDERR($ac_link) && {
-	 test -z "$ac_[]_AC_LANG_ABBREV[]_werror_flag" ||
-	 test ! -s conftest.err
+         test -z "$ac_[]_AC_LANG_ABBREV[]_werror_flag" ||
+         test ! -s conftest.err
        } && test -s conftest$ac_exeext && {
-	 test "$cross_compiling" = yes ||
-	 $as_executable_p conftest$ac_exeext
+         test "$cross_compiling" = yes ||
+         $as_executable_p conftest$ac_exeext
 dnl FIXME: use AS_TEST_X instead when 2.61 is widespread enough.
        }],
       [$2],