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source: m4/boost.m4@ 12e953

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Last change on this file since 12e953 was f5adb5, checked in by Frederik Heber <heber@…>, 14 years ago

Updated Tsuna's boost.m4 version (15 -> 16).

boost checks in configure.ac now cover all used parts.

Property mode set to 100644

File size: 41.5 KB

Rev	Line
[a0ddcf]	1	# boost.m4: Locate Boost headers and libraries for autoconf-based projects.
	2	# Copyright (C) 2007, 2008, 2009, 2010, 2011 Benoit Sigoure <tsuna@lrde.epita.fr>
	3	#
	4	# This program is free software: you can redistribute it and/or modify
	5	# it under the terms of the GNU General Public License as published by
	6	# the Free Software Foundation, either version 3 of the License, or
	7	# (at your option) any later version.
	8	#
	9	# Additional permission under section 7 of the GNU General Public
	10	# License, version 3 ("GPLv3"):
	11	#
	12	# If you convey this file as part of a work that contains a
	13	# configuration script generated by Autoconf, you may do so under
	14	# terms of your choice.
	15	#
	16	# This program is distributed in the hope that it will be useful,
	17	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	# GNU General Public License for more details.
	20	#
	21	# You should have received a copy of the GNU General Public License
	22	# along with this program. If not, see <http://www.gnu.org/licenses/>.
	23
	24	m4_define([_BOOST_SERIAL], [m4_translit([
[bffe54]	25	# serial 16
[a0ddcf]	26	], [#
	27	], [])])
	28
	29	# Original sources can be found at http://github.com/tsuna/boost.m4
	30	# You can fetch the latest version of the script by doing:
	31	# wget http://github.com/tsuna/boost.m4/raw/master/build-aux/boost.m4
	32
	33	# ------ #
	34	# README #
	35	# ------ #
	36
	37	# This file provides several macros to use the various Boost libraries.
	38	# The first macro is BOOST_REQUIRE. It will simply check if it's possible to
	39	# find the Boost headers of a given (optional) minimum version and it will
	40	# define BOOST_CPPFLAGS accordingly. It will add an option --with-boost to
	41	# your configure so that users can specify non standard locations.
	42	# If the user's environment contains BOOST_ROOT and --with-boost was not
	43	# specified, --with-boost=$BOOST_ROOT is implicitly used.
	44	# For more README and documentation, go to http://github.com/tsuna/boost.m4
	45	# Note: THESE MACROS ASSUME THAT YOU USE LIBTOOL. If you don't, don't worry,
	46	# simply read the README, it will show you what to do step by step.
	47
	48	m4_pattern_forbid([^_?(BOOST\|Boost)_])
	49
	50
	51	# _BOOST_SED_CPP(SED-PROGRAM, PROGRAM,
	52	# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
	53	# --------------------------------------------------------
	54	# Same as AC_EGREP_CPP, but leave the result in conftest.i.
	55	#
	56	# SED-PROGRAM is not overquoted, as in AC_EGREP_CPP. It is expanded
	57	# in double-quotes, so escape your double quotes.
	58	#
	59	# It could be useful to turn this into a macro which extracts the
	60	# value of any macro.
	61	m4_define([_BOOST_SED_CPP],
	62	[AC_LANG_PREPROC_REQUIRE()dnl
	63	AC_REQUIRE([AC_PROG_SED])dnl
	64	AC_LANG_CONFTEST([AC_LANG_SOURCE([[$2]])])
	65	AS_IF([dnl eval is necessary to expand ac_cpp.
	66	dnl Ultrix and Pyramid sh refuse to redirect output of eval, so use subshell.
	67	dnl Beware of Windows end-of-lines, for instance if we are running
	68	dnl some Windows programs under Wine. In that case, boost/version.hpp
	69	dnl is certainly using "\r\n", but the regular Unix shell will only
	70	dnl strip `\n' with backquotes, not the `\r'. This results in
	71	dnl boost_cv_lib_version='1_37\r' for instance, which breaks
	72	dnl everything else.
	73	dnl Cannot use 'dnl' after [$4] because a trailing dnl may break AC_CACHE_CHECK
	74	(eval "$ac_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD \|
	75	tr -d '\r' \|
	76	$SED -n -e "$1" >conftest.i 2>&1],
	77	[$3],
	78	[$4])
	79	rm -rf conftest*
	80	])# AC_EGREP_CPP
	81
	82
	83
	84	# BOOST_REQUIRE([VERSION], [ACTION-IF-NOT-FOUND])
	85	# -----------------------------------------------
	86	# Look for Boost. If version is given, it must either be a literal of the form
	87	# "X.Y.Z" where X, Y and Z are integers (the ".Z" part being optional) or a
	88	# variable "$var".
	89	# Defines the value BOOST_CPPFLAGS. This macro only checks for headers with
	90	# the required version, it does not check for any of the Boost libraries.
	91	# On # success, defines HAVE_BOOST. On failure, calls the optional
	92	# ACTION-IF-NOT-FOUND action if one was supplied.
	93	# Otherwise aborts with an error message.
	94	AC_DEFUN([BOOST_REQUIRE],
	95	[AC_REQUIRE([AC_PROG_CXX])dnl
	96	AC_REQUIRE([AC_PROG_GREP])dnl
	97	echo "$as_me: this is boost.m4[]_BOOST_SERIAL" >&AS_MESSAGE_LOG_FD
	98	boost_save_IFS=$IFS
	99	boost_version_req=$1
	100	IFS=.
	101	set x $boost_version_req 0 0 0
	102	IFS=$boost_save_IFS
	103	shift
	104	boost_version_req=`expr "$[1]" '' 100000 + "$[2]" '' 100 + "$[3]"`
	105	boost_version_req_string=$[1].$[2].$[3]
	106	AC_ARG_WITH([boost],
	107	[AS_HELP_STRING([--with-boost=DIR],
	108	[prefix of Boost $1 @<:@guess@:>@])])dnl
	109	AC_ARG_VAR([BOOST_ROOT],[Location of Boost installation])dnl
	110	# If BOOST_ROOT is set and the user has not provided a value to
	111	# --with-boost, then treat BOOST_ROOT as if it the user supplied it.
	112	if test x"$BOOST_ROOT" != x; then
	113	if test x"$with_boost" = x; then
	114	AC_MSG_NOTICE([Detected BOOST_ROOT; continuing with --with-boost=$BOOST_ROOT])
	115	with_boost=$BOOST_ROOT
	116	else
	117	AC_MSG_NOTICE([Detected BOOST_ROOT=$BOOST_ROOT, but overridden by --with-boost=$with_boost])
	118	fi
	119	fi
	120	AC_SUBST([DISTCHECK_CONFIGURE_FLAGS],
	121	["$DISTCHECK_CONFIGURE_FLAGS '--with-boost=$with_boost'"])dnl
	122	boost_save_CPPFLAGS=$CPPFLAGS
	123	AC_CACHE_CHECK([for Boost headers version >= $boost_version_req_string],
	124	[boost_cv_inc_path],
	125	[boost_cv_inc_path=no
	126	AC_LANG_PUSH([C++])dnl
	127	m4_pattern_allow([^BOOST_VERSION$])dnl
	128	AC_LANG_CONFTEST([AC_LANG_PROGRAM([[#include <boost/version.hpp>
	129	#if !defined BOOST_VERSION
	130	# error BOOST_VERSION is not defined
	131	#elif BOOST_VERSION < $boost_version_req
	132	# error Boost headers version < $boost_version_req
	133	#endif
	134	]])])
	135	# If the user provided a value to --with-boost, use it and only it.
	136	case $with_boost in #(
	137	''\|yes) set x '' /opt/local/include /usr/local/include /opt/include \
	138	/usr/include C:/Boost/include;; #(
	139	*) set x "$with_boost/include" "$with_boost";;
	140	esac
	141	shift
	142	for boost_dir
	143	do
	144	# Without --layout=system, Boost (or at least some versions) installs
	145	# itself in <prefix>/include/boost-<version>. This inner loop helps to
	146	# find headers in such directories.
	147	#
	148	# Any ${boost_dir}/boost-x_xx directories are searched in reverse version
	149	# order followed by ${boost_dir}. The final '.' is a sentinel for
	150	# searching $boost_dir" itself. Entries are whitespace separated.
	151	#
	152	# I didn't indent this loop on purpose (to avoid over-indented code)
	153	boost_layout_system_search_list=`cd "$boost_dir" 2>/dev/null \
	154	&& ls -1 \| "${GREP}" '^boost-' \| sort -rn -t- -k2 \
	155	&& echo .`
	156	for boost_inc in $boost_layout_system_search_list
	157	do
	158	if test x"$boost_inc" != x.; then
	159	boost_inc="$boost_dir/$boost_inc"
	160	else
	161	boost_inc="$boost_dir" # Uses sentinel in boost_layout_system_search_list
	162	fi
	163	if test x"$boost_inc" != x; then
	164	# We are going to check whether the version of Boost installed
	165	# in $boost_inc is usable by running a compilation that
	166	# #includes it. But if we pass a -I/some/path in which Boost
	167	# is not installed, the compiler will just skip this -I and
	168	# use other locations (either from CPPFLAGS, or from its list
	169	# of system include directories). As a result we would use
	170	# header installed on the machine instead of the /some/path
	171	# specified by the user. So in that precise case (trying
	172	# $boost_inc), make sure the version.hpp exists.
	173	#
	174	# Use test -e as there can be symlinks.
	175	test -e "$boost_inc/boost/version.hpp" \|\| continue
	176	CPPFLAGS="$CPPFLAGS -I$boost_inc"
	177	fi
	178	AC_COMPILE_IFELSE([], [boost_cv_inc_path=yes], [boost_cv_version=no])
	179	if test x"$boost_cv_inc_path" = xyes; then
	180	if test x"$boost_inc" != x; then
	181	boost_cv_inc_path=$boost_inc
	182	fi
	183	break 2
	184	fi
	185	done
	186	done
	187	AC_LANG_POP([C++])dnl
	188	])
	189	case $boost_cv_inc_path in #(
	190	no)
	191	boost_errmsg="cannot find Boost headers version >= $boost_version_req_string"
	192	m4_if([$2], [], [AC_MSG_ERROR([$boost_errmsg])],
	193	[AC_MSG_NOTICE([$boost_errmsg])])
	194	$2
	195	;;#(
	196	yes)
	197	BOOST_CPPFLAGS=
	198	;;#(
	199	*)
	200	AC_SUBST([BOOST_CPPFLAGS], ["-I$boost_cv_inc_path"])dnl
	201	;;
	202	esac
	203	if test x"$boost_cv_inc_path" != xno; then
	204	AC_DEFINE([HAVE_BOOST], [1],
	205	[Defined if the requested minimum BOOST version is satisfied])
	206	AC_CACHE_CHECK([for Boost's header version],
	207	[boost_cv_lib_version],
	208	[m4_pattern_allow([^BOOST_LIB_VERSION$])dnl
	209	_BOOST_SED_CPP([/^boost-lib-version = /{s///;s/\"//g;p;q;}],
	210	[#include <boost/version.hpp>
	211	boost-lib-version = BOOST_LIB_VERSION],
	212	[boost_cv_lib_version=`cat conftest.i`])])
	213	# e.g. "134" for 1_34_1 or "135" for 1_35
	214	boost_major_version=`echo "$boost_cv_lib_version" \| sed 's/_//;s/_.*//'`
	215	case $boost_major_version in #(
	216	'' \| [[!0-9]])
	217	AC_MSG_ERROR([invalid value: boost_major_version=$boost_major_version])
	218	;;
	219	esac
	220	fi
	221	CPPFLAGS=$boost_save_CPPFLAGS
	222	])# BOOST_REQUIRE
	223
	224	# BOOST_STATIC()
	225	# --------------
	226	# Add the "--enable-static-boost" configure argument. If this argument is given
	227	# on the command line, static versions of the libraries will be looked up.
	228	AC_DEFUN([BOOST_STATIC],
	229	[AC_ARG_ENABLE([static-boost],
	230	[AC_HELP_STRING([--enable-static-boost],
	231	[Prefer the static boost libraries over the shared ones [no]])],
	232	[enable_static_boost=yes],
	233	[enable_static_boost=no])])# BOOST_STATIC
	234
	235	# BOOST_FIND_HEADER([HEADER-NAME], [ACTION-IF-NOT-FOUND], [ACTION-IF-FOUND])
	236	# --------------------------------------------------------------------------
	237	# Wrapper around AC_CHECK_HEADER for Boost headers. Useful to check for
	238	# some parts of the Boost library which are only made of headers and don't
	239	# require linking (such as Boost.Foreach).
	240	#
	241	# Default ACTION-IF-NOT-FOUND: Fail with a fatal error unless Boost couldn't be
	242	# found in the first place, in which case by default a notice is issued to the
	243	# user. Presumably if we haven't died already it's because it's OK to not have
	244	# Boost, which is why only a notice is issued instead of a hard error.
	245	#
	246	# Default ACTION-IF-FOUND: define the preprocessor symbol HAVE_<HEADER-NAME> in
	247	# case of success # (where HEADER-NAME is written LIKE_THIS, e.g.,
	248	# HAVE_BOOST_FOREACH_HPP).
	249	AC_DEFUN([BOOST_FIND_HEADER],
	250	[AC_REQUIRE([BOOST_REQUIRE])dnl
	251	if test x"$boost_cv_inc_path" = xno; then
	252	m4_default([$2], [AC_MSG_NOTICE([Boost not available, not searching for $1])])
	253	else
	254	AC_LANG_PUSH([C++])dnl
	255	boost_save_CPPFLAGS=$CPPFLAGS
	256	CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
	257	AC_CHECK_HEADER([$1],
	258	[m4_default([$3], [AC_DEFINE(AS_TR_CPP([HAVE_$1]), [1],
	259	[Define to 1 if you have <$1>])])],
	260	[m4_default([$2], [AC_MSG_ERROR([cannot find $1])])])
	261	CPPFLAGS=$boost_save_CPPFLAGS
	262	AC_LANG_POP([C++])dnl
	263	fi
	264	])# BOOST_FIND_HEADER
	265
	266
	267	# BOOST_FIND_LIB([LIB-NAME], [PREFERRED-RT-OPT], [HEADER-NAME], [CXX-TEST],
	268	# [CXX-PROLOGUE])
	269	# -------------------------------------------------------------------------
	270	# Look for the Boost library LIB-NAME (e.g., LIB-NAME = `thread', for
	271	# libboost_thread). Check that HEADER-NAME works and check that
	272	# libboost_LIB-NAME can link with the code CXX-TEST. The optional argument
	273	# CXX-PROLOGUE can be used to include some C++ code before the `main'
	274	# function.
	275	#
	276	# Invokes BOOST_FIND_HEADER([HEADER-NAME]) (see above).
	277	#
	278	# Boost libraries typically come compiled with several flavors (with different
	279	# runtime options) so PREFERRED-RT-OPT is the preferred suffix. A suffix is one
	280	# or more of the following letters: sgdpn (in that order). s = static
	281	# runtime, d = debug build, g = debug/diagnostic runtime, p = STLPort build,
	282	# n = (unsure) STLPort build without iostreams from STLPort (it looks like `n'
	283	# must always be used along with `p'). Additionally, PREFERRED-RT-OPT can
	284	# start with `mt-' to indicate that there is a preference for multi-thread
	285	# builds. Some sample values for PREFERRED-RT-OPT: (nothing), mt, d, mt-d, gdp
	286	# ... If you want to make sure you have a specific version of Boost
	287	# (eg, >= 1.33) you must invoke BOOST_REQUIRE before this macro.
	288	AC_DEFUN([BOOST_FIND_LIB],
	289	[AC_REQUIRE([BOOST_REQUIRE])dnl
	290	AC_REQUIRE([_BOOST_FIND_COMPILER_TAG])dnl
	291	AC_REQUIRE([BOOST_STATIC])dnl
	292	AC_REQUIRE([_BOOST_GUESS_WHETHER_TO_USE_MT])dnl
	293	if test x"$boost_cv_inc_path" = xno; then
	294	AC_MSG_NOTICE([Boost not available, not searching for the Boost $1 library])
	295	else
	296	dnl The else branch is huge and wasn't intended on purpose.
	297	AC_LANG_PUSH([C++])dnl
	298	AS_VAR_PUSHDEF([Boost_lib], [boost_cv_lib_$1])dnl
	299	AS_VAR_PUSHDEF([Boost_lib_LDFLAGS], [boost_cv_lib_$1_LDFLAGS])dnl
	300	AS_VAR_PUSHDEF([Boost_lib_LDPATH], [boost_cv_lib_$1_LDPATH])dnl
	301	AS_VAR_PUSHDEF([Boost_lib_LIBS], [boost_cv_lib_$1_LIBS])dnl
	302	BOOST_FIND_HEADER([$3])
	303	boost_save_CPPFLAGS=$CPPFLAGS
	304	CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
	305	# Now let's try to find the library. The algorithm is as follows: first look
	306	# for a given library name according to the user's PREFERRED-RT-OPT. For each
	307	# library name, we prefer to use the ones that carry the tag (toolset name).
	308	# Each library is searched through the various standard paths were Boost is
	309	# usually installed. If we can't find the standard variants, we try to
	310	# enforce -mt (for instance on MacOSX, libboost_threads.dylib doesn't exist
	311	# but there's -obviously- libboost_threads-mt.dylib).
	312	AC_CACHE_CHECK([for the Boost $1 library], [Boost_lib],
	313	[Boost_lib=no
	314	case "$2" in #(
	315	mt \| mt-) boost_mt=-mt; boost_rtopt=;; #(
	316	mt* \| mt-) boost_mt=-mt; boost_rtopt=`expr "X$2" : 'Xmt-\(.*\)'`;; #(
	317	*) boost_mt=; boost_rtopt=$2;;
	318	esac
	319	if test $enable_static_boost = yes; then
	320	boost_rtopt="s$boost_rtopt"
	321	fi
	322	# Find the proper debug variant depending on what we've been asked to find.
	323	case $boost_rtopt in #(
	324	d) boost_rt_d=$boost_rtopt;; #(
	325	[[sgpn]]) # Insert the `d' at the right place (in between `sg' and `pn')
	326	boost_rt_d=`echo "$boost_rtopt" \| sed 's/\(sg\)\(pn\)/\1\2/'`;; #(
	327	*) boost_rt_d='-d';;
	328	esac
	329	# If the PREFERRED-RT-OPT are not empty, prepend a `-'.
	330	test -n "$boost_rtopt" && boost_rtopt="-$boost_rtopt"
	331	$boost_guess_use_mt && boost_mt=-mt
	332	# Look for the abs path the static archive.
	333	# $libext is computed by Libtool but let's make sure it's non empty.
	334	test -z "$libext" &&
	335	AC_MSG_ERROR([the libext variable is empty, did you invoke Libtool?])
	336	boost_save_ac_objext=$ac_objext
	337	# Generate the test file.
	338	AC_LANG_CONFTEST([AC_LANG_PROGRAM([#include <$3>
	339	$5], [$4])])
	340	dnl Optimization hacks: compiling C++ is slow, especially with Boost. What
	341	dnl we're trying to do here is guess the right combination of link flags
	342	dnl (LIBS / LDFLAGS) to use a given library. This can take several
	343	dnl iterations before it succeeds and is thus very slow. So what we do
	344	dnl instead is that we compile the code first (and thus get an object file,
	345	dnl typically conftest.o). Then we try various combinations of link flags
	346	dnl until we succeed to link conftest.o in an executable. The problem is
	347	dnl that the various TRY_LINK / COMPILE_IFELSE macros of Autoconf always
	348	dnl remove all the temporary files including conftest.o. So the trick here
	349	dnl is to temporarily change the value of ac_objext so that conftest.o is
	350	dnl preserved accross tests. This is obviously fragile and I will burn in
	351	dnl hell for not respecting Autoconf's documented interfaces, but in the
	352	dnl mean time, it optimizes the macro by a factor of 5 to 30.
	353	dnl Another small optimization: the first argument of AC_COMPILE_IFELSE left
	354	dnl empty because the test file is generated only once above (before we
	355	dnl start the for loops).
	356	AC_COMPILE_IFELSE([],
	357	[ac_objext=do_not_rm_me_plz],
	358	[AC_MSG_ERROR([cannot compile a test that uses Boost $1])])
	359	ac_objext=$boost_save_ac_objext
	360	boost_failed_libs=
	361	# Don't bother to ident the 6 nested for loops, only the 2 innermost ones
	362	# matter.
	363	for boost_tag_ in -$boost_cv_lib_tag ''; do
	364	for boost_ver_ in -$boost_cv_lib_version ''; do
	365	for boost_mt_ in $boost_mt -mt ''; do
	366	for boost_rtopt_ in $boost_rtopt '' -d; do
	367	for boost_lib in \
	368	boost_$1$boost_tag_$boost_mt_$boost_rtopt_$boost_ver_ \
	369	boost_$1$boost_tag_$boost_rtopt_$boost_ver_ \
	370	boost_$1$boost_tag_$boost_mt_$boost_ver_ \
	371	boost_$1$boost_tag_$boost_ver_
	372	do
	373	# Avoid testing twice the same lib
	374	case $boost_failed_libs in #(
	375	@$boost_lib@) continue;;
	376	esac
	377	# If with_boost is empty, we'll search in /lib first, which is not quite
	378	# right so instead we'll try to a location based on where the headers are.
	379	boost_tmp_lib=$with_boost
	380	test x"$with_boost" = x && boost_tmp_lib=${boost_cv_inc_path%/include}
	381	for boost_ldpath in "$boost_tmp_lib/lib" '' \
	382	/opt/local/lib* /usr/local/lib* /opt/lib* /usr/lib* \
	383	"$with_boost" C:/Boost/lib /lib*
	384	do
	385	test -e "$boost_ldpath" \|\| continue
	386	boost_save_LDFLAGS=$LDFLAGS
	387	# Are we looking for a static library?
	388	case $boost_ldpath:$boost_rtopt_ in #(
	389	?:s) # Yes (Non empty boost_ldpath + s in rt opt)
	390	Boost_lib_LIBS="$boost_ldpath/lib$boost_lib.$libext"
	391	test -e "$Boost_lib_LIBS" \|\| continue;; #(
	392	*) # No: use -lboost_foo to find the shared library.
	393	Boost_lib_LIBS="-l$boost_lib";;
	394	esac
	395	boost_save_LIBS=$LIBS
	396	LIBS="$Boost_lib_LIBS $LIBS"
	397	test x"$boost_ldpath" != x && LDFLAGS="$LDFLAGS -L$boost_ldpath"
	398	dnl First argument of AC_LINK_IFELSE left empty because the test file is
	399	dnl generated only once above (before we start the for loops).
	400	_BOOST_AC_LINK_IFELSE([],
	401	[Boost_lib=yes], [Boost_lib=no])
	402	ac_objext=$boost_save_ac_objext
	403	LDFLAGS=$boost_save_LDFLAGS
	404	LIBS=$boost_save_LIBS
	405	if test x"$Boost_lib" = xyes; then
	406	Boost_lib_LDFLAGS="-L$boost_ldpath -Wl,-R$boost_ldpath"
	407	Boost_lib_LDPATH="$boost_ldpath"
	408	break 6
	409	else
	410	boost_failed_libs="$boost_failed_libs@$boost_lib@"
	411	fi
	412	done
	413	done
	414	done
	415	done
	416	done
	417	done
	418	rm -f conftest.$ac_objext
	419	])
	420	case $Boost_lib in #(
	421	no) _AC_MSG_LOG_CONFTEST
	422	AC_MSG_ERROR([cannot find the flags to link with Boost $1])
	423	;;
	424	esac
	425	AC_SUBST(AS_TR_CPP([BOOST_$1_LDFLAGS]), [$Boost_lib_LDFLAGS])dnl
	426	AC_SUBST(AS_TR_CPP([BOOST_$1_LDPATH]), [$Boost_lib_LDPATH])dnl
	427	AC_SUBST([BOOST_LDPATH], [$Boost_lib_LDPATH])dnl
	428	AC_SUBST(AS_TR_CPP([BOOST_$1_LIBS]), [$Boost_lib_LIBS])dnl
	429	CPPFLAGS=$boost_save_CPPFLAGS
	430	AS_VAR_POPDEF([Boost_lib])dnl
	431	AS_VAR_POPDEF([Boost_lib_LDFLAGS])dnl
	432	AS_VAR_POPDEF([Boost_lib_LDPATH])dnl
	433	AS_VAR_POPDEF([Boost_lib_LIBS])dnl
	434	AC_LANG_POP([C++])dnl
	435	fi
	436	])# BOOST_FIND_LIB
	437
	438
	439	# --------------------------------------- #
	440	# Checks for the various Boost libraries. #
	441	# --------------------------------------- #
	442
	443	# List of boost libraries: http://www.boost.org/libs/libraries.htm
	444	# The page http://beta.boost.org/doc/libs is useful: it gives the first release
	445	# version of each library (among other things).
	446
	447	# BOOST_DEFUN(LIBRARY, CODE)
	448	# --------------------------
	449	# Define BOOST_<LIBRARY-UPPERCASE> as a macro that runs CODE.
	450	#
	451	# Use indir to avoid the warning on underquoted macro name given to AC_DEFUN.
	452	m4_define([BOOST_DEFUN],
	453	[m4_indir([AC_DEFUN],
	454	m4_toupper([BOOST_$1]),
	455	[m4_pushdef([BOOST_Library], [$1])dnl
	456	$2
	457	m4_popdef([BOOST_Library])dnl
	458	])
	459	])
	460
	461	# BOOST_ARRAY()
	462	# -------------
	463	# Look for Boost.Array
	464	BOOST_DEFUN([Array],
	465	[BOOST_FIND_HEADER([boost/array.hpp])])
	466
	467
	468	# BOOST_ASIO()
	469	# ------------
	470	# Look for Boost.Asio (new in Boost 1.35).
	471	BOOST_DEFUN([Asio],
	472	[AC_REQUIRE([BOOST_SYSTEM])dnl
	473	BOOST_FIND_HEADER([boost/asio.hpp])])
	474
	475
	476	# BOOST_BIND()
	477	# ------------
	478	# Look for Boost.Bind
	479	BOOST_DEFUN([Bind],
	480	[BOOST_FIND_HEADER([boost/bind.hpp])])
	481
	482
	483	# BOOST_CONVERSION()
	484	# ------------------
	485	# Look for Boost.Conversion (cast / lexical_cast)
	486	BOOST_DEFUN([Conversion],
	487	[BOOST_FIND_HEADER([boost/cast.hpp])
	488	BOOST_FIND_HEADER([boost/lexical_cast.hpp])
	489	])# BOOST_CONVERSION
	490
	491
	492	# BOOST_DATE_TIME([PREFERRED-RT-OPT])
	493	# -----------------------------------
	494	# Look for Boost.Date_Time. For the documentation of PREFERRED-RT-OPT, see the
	495	# documentation of BOOST_FIND_LIB above.
	496	BOOST_DEFUN([Date_Time],
	497	[BOOST_FIND_LIB([date_time], [$1],
	498	[boost/date_time/posix_time/posix_time.hpp],
	499	[boost::posix_time::ptime t;])
	500	])# BOOST_DATE_TIME
	501
	502
[f5adb5]	503	# BOOST_EXCEPTION()
	504	# ------------
	505	# Look for Boost.Exception
	506	BOOST_DEFUN([Exception],
	507	[BOOST_FIND_HEADER([boost/exception/all.hpp])])
	508
	509
[a0ddcf]	510	# BOOST_FILESYSTEM([PREFERRED-RT-OPT])
	511	# ------------------------------------
	512	# Look for Boost.Filesystem. For the documentation of PREFERRED-RT-OPT, see
	513	# the documentation of BOOST_FIND_LIB above.
	514	# Do not check for boost/filesystem.hpp because this file was introduced in
	515	# 1.34.
	516	BOOST_DEFUN([Filesystem],
	517	[# Do we have to check for Boost.System? This link-time dependency was
	518	# added as of 1.35.0. If we have a version <1.35, we must not attempt to
	519	# find Boost.System as it didn't exist by then.
	520	if test $boost_major_version -ge 135; then
	521	BOOST_SYSTEM([$1])
	522	fi # end of the Boost.System check.
	523	boost_filesystem_save_LIBS=$LIBS
	524	boost_filesystem_save_LDFLAGS=$LDFLAGS
	525	m4_pattern_allow([^BOOST_SYSTEM_(LIBS\|LDFLAGS)$])dnl
	526	LIBS="$LIBS $BOOST_SYSTEM_LIBS"
	527	LDFLAGS="$LDFLAGS $BOOST_SYSTEM_LDFLAGS"
	528	BOOST_FIND_LIB([filesystem], [$1],
	529	[boost/filesystem/path.hpp], [boost::filesystem::path p;])
	530	if test $enable_static_boost = yes && test $boost_major_version -ge 135; then
	531	AC_SUBST([BOOST_FILESYSTEM_LIBS], ["$BOOST_FILESYSTEM_LIBS $BOOST_SYSTEM_LIBS"])
	532	fi
	533	LIBS=$boost_filesystem_save_LIBS
	534	LDFLAGS=$boost_filesystem_save_LDFLAGS
	535	])# BOOST_FILESYSTEM
	536
	537
	538	# BOOST_FOREACH()
	539	# ---------------
	540	# Look for Boost.Foreach
	541	BOOST_DEFUN([Foreach],
	542	[BOOST_FIND_HEADER([boost/foreach.hpp])])
	543
	544
	545	# BOOST_FORMAT()
	546	# --------------
	547	# Look for Boost.Format
	548	# Note: we can't check for boost/format/format_fwd.hpp because the header isn't
	549	# standalone. It can't be compiled because it triggers the following error:
	550	# boost/format/detail/config_macros.hpp:88: error: 'locale' in namespace 'std'
	551	# does not name a type
	552	BOOST_DEFUN([Format],
	553	[BOOST_FIND_HEADER([boost/format.hpp])])
	554
	555
	556	# BOOST_FUNCTION()
	557	# ----------------
	558	# Look for Boost.Function
	559	BOOST_DEFUN([Function],
	560	[BOOST_FIND_HEADER([boost/function.hpp])])
	561
	562
	563	# BOOST_GRAPH([PREFERRED-RT-OPT])
	564	# -------------------------------
	565	# Look for Boost.Graphs. For the documentation of PREFERRED-RT-OPT, see the
	566	# documentation of BOOST_FIND_LIB above.
	567	BOOST_DEFUN([Graph],
	568	[BOOST_FIND_LIB([graph], [$1],
	569	[boost/graph/adjacency_list.hpp], [boost::adjacency_list<> g;])
	570	])# BOOST_GRAPH
	571
	572
	573	# BOOST_IOSTREAMS([PREFERRED-RT-OPT])
	574	# -----------------------------------
	575	# Look for Boost.IOStreams. For the documentation of PREFERRED-RT-OPT, see the
	576	# documentation of BOOST_FIND_LIB above.
	577	BOOST_DEFUN([IOStreams],
	578	[BOOST_FIND_LIB([iostreams], [$1],
	579	[boost/iostreams/device/file_descriptor.hpp],
	580	[boost::iostreams::file_descriptor fd; fd.close();])
	581	])# BOOST_IOSTREAMS
	582
	583
	584	# BOOST_HASH()
	585	# ------------
	586	# Look for Boost.Functional/Hash
	587	BOOST_DEFUN([Hash],
	588	[BOOST_FIND_HEADER([boost/functional/hash.hpp])])
	589
	590
[f5adb5]	591	# BOOST_ITERATOR()
	592	# ------------
	593	# Look for Boost.Iterator
	594	BOOST_DEFUN([Iterator],
	595	[BOOST_FIND_HEADER([boost/iterator/iterator_adaptor.hpp])])
	596
	597
[a0ddcf]	598	# BOOST_LAMBDA()
	599	# --------------
	600	# Look for Boost.Lambda
	601	BOOST_DEFUN([Lambda],
	602	[BOOST_FIND_HEADER([boost/lambda/lambda.hpp])])
	603
	604
[bffe54]	605	# BOOST_LOG([PREFERRED-RT-OPT])
	606	# -----------------------------
	607	# Look for Boost.Log For the documentation of PREFERRED-RT-OPT, see the
	608	# documentation of BOOST_FIND_LIB above.
	609	BOOST_DEFUN([Log],
	610	[BOOST_FIND_LIB([log], [$1],
	611	[boost/log/core/core.hpp],
	612	[boost::log::attribute a; a.get_value();])
	613	])# BOOST_LOG
	614
	615
	616	# BOOST_LOG_SETUP([PREFERRED-RT-OPT])
	617	# -----------------------------------
	618	# Look for Boost.Log For the documentation of PREFERRED-RT-OPT, see the
	619	# documentation of BOOST_FIND_LIB above.
	620	BOOST_DEFUN([Log_Setup],
	621	[AC_REQUIRE([BOOST_LOG])dnl
	622	BOOST_FIND_LIB([log_setup], [$1],
	623	[boost/log/utility/init/from_settings.hpp],
	624	[boost::log::basic_settings<char> bs; bs.empty();])
	625	])# BOOST_LOG_SETUP
	626
	627
[a0ddcf]	628	# BOOST_MATH()
	629	# ------------
	630	# Look for Boost.Math
	631	# TODO: This library isn't header-only but it comes in multiple different
	632	# flavors that don't play well with BOOST_FIND_LIB (e.g, libboost_math_c99,
	633	# libboost_math_c99f, libboost_math_c99l, libboost_math_tr1,
	634	# libboost_math_tr1f, libboost_math_tr1l). This macro must be fixed to do the
	635	# right thing anyway.
	636	BOOST_DEFUN([Math],
	637	[BOOST_FIND_HEADER([boost/math/special_functions.hpp])])
	638
	639
	640	# BOOST_MULTIARRAY()
	641	# ------------------
	642	# Look for Boost.MultiArray
	643	BOOST_DEFUN([MultiArray],
	644	[BOOST_FIND_HEADER([boost/multi_array.hpp])])
	645
	646
	647	# BOOST_NUMERIC_CONVERSION()
	648	# --------------------------
	649	# Look for Boost.NumericConversion (policy-based numeric conversion)
	650	BOOST_DEFUN([Numeric_Conversion],
	651	[BOOST_FIND_HEADER([boost/numeric/conversion/converter.hpp])
	652	])# BOOST_NUMERIC_CONVERSION
	653
	654
	655	# BOOST_OPTIONAL()
	656	# ----------------
	657	# Look for Boost.Optional
	658	BOOST_DEFUN([Optional],
	659	[BOOST_FIND_HEADER([boost/optional.hpp])])
	660
	661
	662	# BOOST_PREPROCESSOR()
	663	# --------------------
	664	# Look for Boost.Preprocessor
	665	BOOST_DEFUN([Preprocessor],
	666	[BOOST_FIND_HEADER([boost/preprocessor/repeat.hpp])])
	667
	668
[bffe54]	669	# BOOST_UNORDERED()
	670	# -----------------
	671	# Look for Boost.Unordered
	672	BOOST_DEFUN([Unordered],
	673	[BOOST_FIND_HEADER([boost/unordered_map.hpp])])
	674
	675
	676	# BOOST_UUID()
	677	# ------------
	678	# Look for Boost.Uuid
	679	BOOST_DEFUN([Uuid],
	680	[BOOST_FIND_HEADER([boost/uuid/uuid.hpp])])
	681
	682
[a0ddcf]	683	# BOOST_PROGRAM_OPTIONS([PREFERRED-RT-OPT])
	684	# -----------------------------------------
	685	# Look for Boost.Program_options. For the documentation of PREFERRED-RT-OPT,
	686	# see the documentation of BOOST_FIND_LIB above.
	687	BOOST_DEFUN([Program_Options],
	688	[BOOST_FIND_LIB([program_options], [$1],
	689	[boost/program_options.hpp],
	690	[boost::program_options::options_description d("test");])
	691	])# BOOST_PROGRAM_OPTIONS
	692
	693
	694
	695	# _BOOST_PYTHON_CONFIG(VARIABLE, FLAG)
	696	# ------------------------------------
	697	# Save VARIABLE, and define it via `python-config --FLAG`.
	698	# Substitute BOOST_PYTHON_VARIABLE.
	699	m4_define([_BOOST_PYTHON_CONFIG],
	700	[AC_SUBST([BOOST_PYTHON_$1],
	701	[`python-config --$2 2>/dev/null`])dnl
	702	boost_python_save_$1=$$1
	703	$1="$$1 $BOOST_PYTHON_$1"])
	704
	705
	706	# BOOST_PYTHON([PREFERRED-RT-OPT])
	707	# --------------------------------
	708	# Look for Boost.Python. For the documentation of PREFERRED-RT-OPT,
	709	# see the documentation of BOOST_FIND_LIB above.
	710	BOOST_DEFUN([Python],
	711	[_BOOST_PYTHON_CONFIG([CPPFLAGS], [includes])
	712	_BOOST_PYTHON_CONFIG([LDFLAGS], [ldflags])
	713	_BOOST_PYTHON_CONFIG([LIBS], [libs])
	714	m4_pattern_allow([^BOOST_PYTHON_MODULE$])dnl
	715	BOOST_FIND_LIB([python], [$1],
	716	[boost/python.hpp],
	717	[], [BOOST_PYTHON_MODULE(empty) {}])
	718	CPPFLAGS=$boost_python_save_CPPFLAGS
	719	LDFLAGS=$boost_python_save_LDFLAGS
	720	LIBS=$boost_python_save_LIBS
	721	])# BOOST_PYTHON
	722
	723
	724	# BOOST_REF()
	725	# -----------
	726	# Look for Boost.Ref
	727	BOOST_DEFUN([Ref],
	728	[BOOST_FIND_HEADER([boost/ref.hpp])])
	729
	730
	731	# BOOST_REGEX([PREFERRED-RT-OPT])
	732	# -------------------------------
	733	# Look for Boost.Regex. For the documentation of PREFERRED-RT-OPT, see the
	734	# documentation of BOOST_FIND_LIB above.
	735	BOOST_DEFUN([Regex],
	736	[BOOST_FIND_LIB([regex], [$1],
	737	[boost/regex.hpp],
	738	[boost::regex exp("*"); boost::regex_match("foo", exp);])
	739	])# BOOST_REGEX
	740
	741
	742	# BOOST_SERIALIZATION([PREFERRED-RT-OPT])
	743	# ---------------------------------------
	744	# Look for Boost.Serialization. For the documentation of PREFERRED-RT-OPT, see
	745	# the documentation of BOOST_FIND_LIB above.
	746	BOOST_DEFUN([Serialization],
	747	[BOOST_FIND_LIB([serialization], [$1],
	748	[boost/archive/text_oarchive.hpp],
	749	[std::ostream* o = 0; // Cheap way to get an ostream...
	750	boost::archive::text_oarchive t(*o);])
[bffe54]	751	])# BOOST_SERIALIZATION
[a0ddcf]	752
	753
	754	# BOOST_SIGNALS([PREFERRED-RT-OPT])
	755	# ---------------------------------
	756	# Look for Boost.Signals. For the documentation of PREFERRED-RT-OPT, see the
	757	# documentation of BOOST_FIND_LIB above.
	758	BOOST_DEFUN([Signals],
	759	[BOOST_FIND_LIB([signals], [$1],
	760	[boost/signal.hpp],
	761	[boost::signal<void ()> s;])
	762	])# BOOST_SIGNALS
	763
	764
	765	# BOOST_SMART_PTR()
	766	# -----------------
	767	# Look for Boost.SmartPtr
	768	BOOST_DEFUN([Smart_Ptr],
	769	[BOOST_FIND_HEADER([boost/scoped_ptr.hpp])
	770	BOOST_FIND_HEADER([boost/shared_ptr.hpp])
	771	])
	772
	773
	774	# BOOST_STATICASSERT()
	775	# --------------------
	776	# Look for Boost.StaticAssert
	777	BOOST_DEFUN([StaticAssert],
	778	[BOOST_FIND_HEADER([boost/static_assert.hpp])])
	779
	780
	781	# BOOST_STRING_ALGO()
	782	# -------------------
	783	# Look for Boost.StringAlgo
	784	BOOST_DEFUN([String_Algo],
	785	[BOOST_FIND_HEADER([boost/algorithm/string.hpp])
	786	])
	787
	788
	789	# BOOST_SYSTEM([PREFERRED-RT-OPT])
	790	# --------------------------------
	791	# Look for Boost.System. For the documentation of PREFERRED-RT-OPT, see the
	792	# documentation of BOOST_FIND_LIB above. This library was introduced in Boost
	793	# 1.35.0.
	794	BOOST_DEFUN([System],
	795	[BOOST_FIND_LIB([system], [$1],
	796	[boost/system/error_code.hpp],
	797	[boost::system::error_code e; e.clear();])
	798	])# BOOST_SYSTEM
	799
	800
	801	# BOOST_TEST([PREFERRED-RT-OPT])
	802	# ------------------------------
	803	# Look for Boost.Test. For the documentation of PREFERRED-RT-OPT, see the
	804	# documentation of BOOST_FIND_LIB above.
	805	BOOST_DEFUN([Test],
	806	[m4_pattern_allow([^BOOST_CHECK$])dnl
	807	BOOST_FIND_LIB([unit_test_framework], [$1],
	808	[boost/test/unit_test.hpp], [BOOST_CHECK(2 == 2);],
	809	[using boost::unit_test::test_suite;
	810	test_suite* init_unit_test_suite(int argc, char ** argv)
	811	{ return NULL; }])
	812	])# BOOST_TEST
	813
	814
	815	# BOOST_THREADS([PREFERRED-RT-OPT])
	816	# ---------------------------------
	817	# Look for Boost.Thread. For the documentation of PREFERRED-RT-OPT, see the
	818	# documentation of BOOST_FIND_LIB above.
	819	# FIXME: Provide an alias "BOOST_THREAD".
	820	BOOST_DEFUN([Threads],
	821	[dnl Having the pthread flag is required at least on GCC3 where
	822	dnl boost/thread.hpp would complain if we try to compile without
	823	dnl -pthread on GNU/Linux.
	824	AC_REQUIRE([_BOOST_PTHREAD_FLAG])dnl
	825	boost_threads_save_LIBS=$LIBS
	826	boost_threads_save_CPPFLAGS=$CPPFLAGS
	827	LIBS="$LIBS $boost_cv_pthread_flag"
	828	# Yes, we need to put the -pthread thing in CPPFLAGS because with GCC3,
	829	# boost/thread.hpp will trigger a #error if -pthread isn't used:
	830	# boost/config/requires_threads.hpp:47:5: #error "Compiler threading support
	831	# is not turned on. Please set the correct command line options for
	832	# threading: -pthread (Linux), -pthreads (Solaris) or -mthreads (Mingw32)"
	833	CPPFLAGS="$CPPFLAGS $boost_cv_pthread_flag"
	834	BOOST_FIND_LIB([thread], [$1],
	835	[boost/thread.hpp], [boost::thread t; boost::mutex m;])
	836	BOOST_THREAD_LIBS="$BOOST_THREAD_LIBS $boost_cv_pthread_flag"
	837	BOOST_CPPFLAGS="$BOOST_CPPFLAGS $boost_cv_pthread_flag"
	838	LIBS=$boost_threads_save_LIBS
	839	CPPFLAGS=$boost_threads_save_CPPFLAGS
	840	])# BOOST_THREADS
	841
	842
	843	# BOOST_TOKENIZER()
	844	# -----------------
	845	# Look for Boost.Tokenizer
	846	BOOST_DEFUN([Tokenizer],
	847	[BOOST_FIND_HEADER([boost/tokenizer.hpp])])
	848
	849
	850	# BOOST_TRIBOOL()
	851	# ---------------
	852	# Look for Boost.Tribool
	853	BOOST_DEFUN([Tribool],
	854	[BOOST_FIND_HEADER([boost/logic/tribool_fwd.hpp])
	855	BOOST_FIND_HEADER([boost/logic/tribool.hpp])
	856	])
	857
	858
	859	# BOOST_TUPLE()
	860	# -------------
	861	# Look for Boost.Tuple
	862	BOOST_DEFUN([Tuple],
	863	[BOOST_FIND_HEADER([boost/tuple/tuple.hpp])])
	864
	865
	866	# BOOST_TYPETRAITS()
	867	# --------------------
	868	# Look for Boost.TypeTraits
	869	BOOST_DEFUN([TypeTraits],
	870	[BOOST_FIND_HEADER([boost/type_traits.hpp])])
	871
	872
	873	# BOOST_UTILITY()
	874	# ---------------
	875	# Look for Boost.Utility (noncopyable, result_of, base-from-member idiom,
	876	# etc.)
	877	BOOST_DEFUN([Utility],
	878	[BOOST_FIND_HEADER([boost/utility.hpp])])
	879
	880
	881	# BOOST_VARIANT()
	882	# ---------------
	883	# Look for Boost.Variant.
	884	BOOST_DEFUN([Variant],
	885	[BOOST_FIND_HEADER([boost/variant/variant_fwd.hpp])
	886	BOOST_FIND_HEADER([boost/variant.hpp])])
	887
	888
	889	# BOOST_WAVE([PREFERRED-RT-OPT])
	890	# ------------------------------
	891	# NOTE: If you intend to use Wave/Spirit with thread support, make sure you
	892	# call BOOST_THREADS first.
	893	# Look for Boost.Wave. For the documentation of PREFERRED-RT-OPT, see the
	894	# documentation of BOOST_FIND_LIB above.
	895	BOOST_DEFUN([Wave],
	896	[AC_REQUIRE([BOOST_FILESYSTEM])dnl
	897	AC_REQUIRE([BOOST_DATE_TIME])dnl
	898	boost_wave_save_LIBS=$LIBS
	899	boost_wave_save_LDFLAGS=$LDFLAGS
	900	m4_pattern_allow([^BOOST_((FILE)?SYSTEM\|DATE_TIME\|THREAD)_(LIBS\|LDFLAGS)$])dnl
	901	LIBS="$LIBS $BOOST_SYSTEM_LIBS $BOOST_FILESYSTEM_LIBS $BOOST_DATE_TIME_LIBS\
	902	$BOOST_THREAD_LIBS"
	903	LDFLAGS="$LDFLAGS $BOOST_SYSTEM_LDFLAGS $BOOST_FILESYSTEM_LDFLAGS\
	904	$BOOST_DATE_TIME_LDFLAGS $BOOST_THREAD_LDFLAGS"
	905	BOOST_FIND_LIB([wave], [$1],
	906	[boost/wave.hpp],
	907	[boost::wave::token_id id; get_token_name(id);])
	908	LIBS=$boost_wave_save_LIBS
	909	LDFLAGS=$boost_wave_save_LDFLAGS
	910	])# BOOST_WAVE
	911
	912
	913	# BOOST_XPRESSIVE()
	914	# -----------------
	915	# Look for Boost.Xpressive (new since 1.36.0).
	916	BOOST_DEFUN([Xpressive],
	917	[BOOST_FIND_HEADER([boost/xpressive/xpressive.hpp])])
	918
	919
	920	# ----------------- #
	921	# Internal helpers. #
	922	# ----------------- #
	923
	924
	925	# _BOOST_PTHREAD_FLAG()
	926	# ---------------------
	927	# Internal helper for BOOST_THREADS. Based on ACX_PTHREAD:
	928	# http://autoconf-archive.cryp.to/acx_pthread.html
	929	AC_DEFUN([_BOOST_PTHREAD_FLAG],
	930	[AC_REQUIRE([AC_PROG_CXX])dnl
	931	AC_REQUIRE([AC_CANONICAL_HOST])dnl
	932	AC_LANG_PUSH([C++])dnl
	933	AC_CACHE_CHECK([for the flags needed to use pthreads], [boost_cv_pthread_flag],
	934	[ boost_cv_pthread_flag=
	935	# The ordering is (sometimes) important. Some notes on the
	936	# individual items follow:
	937	# (none): in case threads are in libc; should be tried before -Kthread and
	938	# other compiler flags to prevent continual compiler warnings
	939	# -lpthreads: AIX (must check this before -lpthread)
	940	# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
	941	# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
	942	# -llthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
	943	# -pthread: GNU Linux/GCC (kernel threads), BSD/GCC (userland threads)
	944	# -pthreads: Solaris/GCC
	945	# -mthreads: MinGW32/GCC, Lynx/GCC
	946	# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
	947	# doesn't hurt to check since this sometimes defines pthreads too;
	948	# also defines -D_REENTRANT)
	949	# ... -mt is also the pthreads flag for HP/aCC
	950	# -lpthread: GNU Linux, etc.
	951	# --thread-safe: KAI C++
	952	case $host_os in #(
	953	solaris)
	954	# On Solaris (at least, for some versions), libc contains stubbed
	955	# (non-functional) versions of the pthreads routines, so link-based
	956	# tests will erroneously succeed. (We need to link with -pthreads/-mt/
	957	# -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
	958	# a function called by this macro, so we could check for that, but
	959	# who knows whether they'll stub that too in a future libc.) So,
	960	# we'll just look for -pthreads and -lpthread first:
	961	boost_pthread_flags="-pthreads -lpthread -mt -pthread";; #(
	962	*)
	963	boost_pthread_flags="-lpthreads -Kthread -kthread -llthread -pthread \
	964	-pthreads -mthreads -lpthread --thread-safe -mt";;
	965	esac
	966	# Generate the test file.
	967	AC_LANG_CONFTEST([AC_LANG_PROGRAM([#include <pthread.h>],
	968	[pthread_t th; pthread_join(th, 0);
	969	pthread_attr_init(0); pthread_cleanup_push(0, 0);
	970	pthread_create(0,0,0,0); pthread_cleanup_pop(0);])])
	971	for boost_pthread_flag in '' $boost_pthread_flags; do
	972	boost_pthread_ok=false
	973	dnl Re-use the test file already generated.
	974	boost_pthreads__save_LIBS=$LIBS
	975	LIBS="$LIBS $boost_pthread_flag"
	976	AC_LINK_IFELSE([],
	977	[if grep ".*$boost_pthread_flag" conftest.err; then
	978	echo "This flag seems to have triggered warnings" >&AS_MESSAGE_LOG_FD
	979	else
	980	boost_pthread_ok=:; boost_cv_pthread_flag=$boost_pthread_flag
	981	fi])
	982	LIBS=$boost_pthreads__save_LIBS
	983	$boost_pthread_ok && break
	984	done
	985	])
	986	AC_LANG_POP([C++])dnl
	987	])# _BOOST_PTHREAD_FLAG
	988
	989
	990	# _BOOST_gcc_test(MAJOR, MINOR)
	991	# -----------------------------
	992	# Internal helper for _BOOST_FIND_COMPILER_TAG.
	993	m4_define([_BOOST_gcc_test],
	994	["defined __GNUC__ && __GNUC__ == $1 && __GNUC_MINOR__ == $2 && !defined __ICC @ gcc$1$2"])dnl
	995
	996
	997	# _BOOST_FIND_COMPILER_TAG()
	998	# --------------------------
	999	# Internal. When Boost is installed without --layout=system, each library
	1000	# filename will hold a suffix that encodes the compiler used during the
	1001	# build. The Boost build system seems to call this a `tag'.
	1002	AC_DEFUN([_BOOST_FIND_COMPILER_TAG],
	1003	[AC_REQUIRE([AC_PROG_CXX])dnl
	1004	AC_REQUIRE([AC_CANONICAL_HOST])dnl
	1005	AC_CACHE_CHECK([for the toolset name used by Boost for $CXX], [boost_cv_lib_tag],
	1006	[boost_cv_lib_tag=unknown
	1007	if test x$boost_cv_inc_path != xno; then
	1008	AC_LANG_PUSH([C++])dnl
	1009	# The following tests are mostly inspired by boost/config/auto_link.hpp
	1010	# The list is sorted to most recent/common to oldest compiler (in order
	1011	# to increase the likelihood of finding the right compiler with the
	1012	# least number of compilation attempt).
	1013	# Beware that some tests are sensible to the order (for instance, we must
	1014	# look for MinGW before looking for GCC3).
	1015	# I used one compilation test per compiler with a #error to recognize
	1016	# each compiler so that it works even when cross-compiling (let me know
	1017	# if you know a better approach).
	1018	# Known missing tags (known from Boost's tools/build/v2/tools/common.jam):
	1019	# como, edg, kcc, bck, mp, sw, tru, xlc
	1020	# I'm not sure about my test for `il' (be careful: Intel's ICC pre-defines
	1021	# the same defines as GCC's).
	1022	for i in \
	1023	_BOOST_gcc_test(4, 6) \
	1024	_BOOST_gcc_test(4, 5) \
	1025	_BOOST_gcc_test(4, 4) \
	1026	_BOOST_gcc_test(4, 3) \
	1027	_BOOST_gcc_test(4, 2) \
	1028	_BOOST_gcc_test(4, 1) \
	1029	_BOOST_gcc_test(4, 0) \
	1030	"defined __GNUC__ && __GNUC__ == 3 && !defined __ICC \
	1031	&& (defined WIN32 \|\| defined WINNT \|\| defined _WIN32 \|\| defined __WIN32 \
	1032	\|\| defined __WIN32__ \|\| defined __WINNT \|\| defined __WINNT__) @ mgw" \
	1033	_BOOST_gcc_test(3, 4) \
	1034	_BOOST_gcc_test(3, 3) \
	1035	"defined _MSC_VER && _MSC_VER >= 1500 @ vc90" \
	1036	"defined _MSC_VER && _MSC_VER == 1400 @ vc80" \
	1037	_BOOST_gcc_test(3, 2) \
	1038	"defined _MSC_VER && _MSC_VER == 1310 @ vc71" \
	1039	_BOOST_gcc_test(3, 1) \
	1040	_BOOST_gcc_test(3, 0) \
	1041	"defined __BORLANDC__ @ bcb" \
	1042	"defined __ICC && (defined __unix \|\| defined __unix__) @ il" \
	1043	"defined __ICL @ iw" \
	1044	"defined _MSC_VER && _MSC_VER == 1300 @ vc7" \
	1045	_BOOST_gcc_test(2, 95) \
	1046	"defined __MWERKS__ && __MWERKS__ <= 0x32FF @ cw9" \
	1047	"defined _MSC_VER && _MSC_VER < 1300 && !defined UNDER_CE @ vc6" \
	1048	"defined _MSC_VER && _MSC_VER < 1300 && defined UNDER_CE @ evc4" \
	1049	"defined __MWERKS__ && __MWERKS__ <= 0x31FF @ cw8"
	1050	do
	1051	boost_tag_test=`expr "X$i" : 'X\([[^@]]*\) @ '`
	1052	boost_tag=`expr "X$i" : 'X[[^@]]* @ \(.*\)'`
	1053	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	1054	#if $boost_tag_test
	1055	/* OK */
	1056	#else
	1057	# error $boost_tag_test
	1058	#endif
	1059	]])], [boost_cv_lib_tag=$boost_tag; break], [])
	1060	done
	1061	AC_LANG_POP([C++])dnl
	1062	case $boost_cv_lib_tag in #(
	1063	# Some newer (>= 1.35?) versions of Boost seem to only use "gcc" as opposed
	1064	# to "gcc41" for instance.
	1065	-gcc \| '-gcc ') :;; #( Don't re-add -gcc: it's already in there.
	1066	gcc*)
	1067	boost_tag_x=
	1068	case $host_os in #(
	1069	darwin*)
	1070	if test $boost_major_version -ge 136; then
	1071	# The `x' added in r46793 of Boost.
	1072	boost_tag_x=x
	1073	fi;;
	1074	esac
	1075	# We can specify multiple tags in this variable because it's used by
	1076	# BOOST_FIND_LIB that does a `for tag in -$boost_cv_lib_tag' ...
	1077	boost_cv_lib_tag="$boost_tag_x$boost_cv_lib_tag -${boost_tag_x}gcc"
	1078	;; #(
	1079	unknown)
	1080	AC_MSG_WARN([[could not figure out which toolset name to use for $CXX]])
	1081	boost_cv_lib_tag=
	1082	;;
	1083	esac
	1084	fi])dnl end of AC_CACHE_CHECK
	1085	])# _BOOST_FIND_COMPILER_TAG
	1086
	1087
	1088	# _BOOST_GUESS_WHETHER_TO_USE_MT()
	1089	# --------------------------------
	1090	# Compile a small test to try to guess whether we should favor MT (Multi
	1091	# Thread) flavors of Boost. Sets boost_guess_use_mt accordingly.
	1092	AC_DEFUN([_BOOST_GUESS_WHETHER_TO_USE_MT],
	1093	[# Check whether we do better use `mt' even though we weren't ask to.
	1094	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	1095	#if defined _REENTRANT \|\| defined _MT \|\| defined __MT__
	1096	/* use -mt */
	1097	#else
	1098	# error MT not needed
	1099	#endif
	1100	]])], [boost_guess_use_mt=:], [boost_guess_use_mt=false])
	1101	])
	1102
	1103	# _BOOST_AC_LINK_IFELSE(PROGRAM, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
	1104	# -------------------------------------------------------------------
	1105	# Fork of _AC_LINK_IFELSE that preserves conftest.o across calls. Fragile,
	1106	# will break when Autoconf changes its internals. Requires that you manually
	1107	# rm -f conftest.$ac_objext in between to really different tests, otherwise
	1108	# you will try to link a conftest.o left behind by a previous test.
	1109	# Used to aggressively optimize BOOST_FIND_LIB (see the big comment in this
	1110	# macro).
	1111	#
	1112	# Don't use "break" in the actions, as it would short-circuit some code
	1113	# this macro runs after the actions.
	1114	m4_define([_BOOST_AC_LINK_IFELSE],
	1115	[m4_ifvaln([$1], [AC_LANG_CONFTEST([$1])])dnl
	1116	rm -f conftest$ac_exeext
	1117	boost_save_ac_ext=$ac_ext
	1118	boost_use_source=:
	1119	# If we already have a .o, re-use it. We change $ac_ext so that $ac_link
	1120	# tries to link the existing object file instead of compiling from source.
	1121	test -f conftest.$ac_objext && ac_ext=$ac_objext && boost_use_source=false &&
	1122	_AS_ECHO_LOG([re-using the existing conftest.$ac_objext])
	1123	AS_IF([_AC_DO_STDERR($ac_link) && {
	1124	test -z "$ac_[]_AC_LANG_ABBREV[]_werror_flag" \|\|
	1125	test ! -s conftest.err
	1126	} && test -s conftest$ac_exeext && {
	1127	test "$cross_compiling" = yes \|\|
	1128	$as_executable_p conftest$ac_exeext
	1129	dnl FIXME: use AS_TEST_X instead when 2.61 is widespread enough.
	1130	}],
	1131	[$2],
	1132	[if $boost_use_source; then
	1133	_AC_MSG_LOG_CONFTEST
	1134	fi
	1135	$3])
	1136	ac_objext=$boost_save_ac_objext
	1137	ac_ext=$boost_save_ac_ext
	1138	dnl Delete also the IPA/IPO (Inter Procedural Analysis/Optimization)
	1139	dnl information created by the PGI compiler (conftest_ipa8_conftest.oo),
	1140	dnl as it would interfere with the next link command.
	1141	rm -f core conftest.err conftest_ipa8_conftest.oo \
	1142	conftest$ac_exeext m4_ifval([$1], [conftest.$ac_ext])[]dnl
	1143	])# _BOOST_AC_LINK_IFELSE
	1144
	1145	# Local Variables:
	1146	# mode: autoconf
	1147	# End:

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