1 # boost.m4: Locate Boost headers and libraries for autoconf-based projects.
2 # Copyright (C) 2007-2011, 2014 Benoit Sigoure <tsuna@lrde.epita.fr>
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.
9 # Additional permission under section 7 of the GNU General Public
10 # License, version 3 ("GPLv3"):
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.
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.
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/>.
24 m4_define([_BOOST_SERIAL], [m4_translit([
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
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.
48 m4_pattern_forbid([^_?(BOOST|Boost)_])
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.
56 # SED-PROGRAM is *not* overquoted, as in AC_EGREP_CPP. It is expanded
57 # in double-quotes, so escape your double quotes.
59 # It could be useful to turn this into a macro which extracts the
61 m4_define([_BOOST_SED_CPP],
62 [AC_LANG_PUSH([C++])dnl
63 AC_LANG_PREPROC_REQUIRE()dnl
64 AC_REQUIRE([AC_PROG_SED])dnl
65 AC_LANG_CONFTEST([AC_LANG_SOURCE([[$2]])])
66 AS_IF([dnl eval is necessary to expand ac_cpp.
67 dnl Ultrix and Pyramid sh refuse to redirect output of eval, so use subshell.
68 dnl Beware of Windows end-of-lines, for instance if we are running
69 dnl some Windows programs under Wine. In that case, boost/version.hpp
70 dnl is certainly using "\r\n", but the regular Unix shell will only
71 dnl strip `\n' with backquotes, not the `\r'. This results in
72 dnl boost_cv_lib_version='1_37\r' for instance, which breaks
74 dnl Cannot use 'dnl' after [$4] because a trailing dnl may break AC_CACHE_CHECK
76 dnl Beware that GCC 5, when expanding macros, may embed # line directives
77 dnl a within single line:
81 dnl # 1 "<command-line>"
83 dnl # 1 "/opt/local/include/boost/version.hpp" 1 3
84 dnl # 2 "conftest.cc" 2
85 dnl boost-lib-version =
86 dnl # 2 "conftest.cc" 3
89 dnl So get rid of the # and empty lines, and glue the remaining ones together.
90 (eval "$ac_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD |
92 grep -v '^[[[:space:]]]*$' |
95 $SED -n -e "$1" >conftest.i 2>&1],
104 # BOOST_REQUIRE([VERSION], [ACTION-IF-NOT-FOUND])
105 # -----------------------------------------------
106 # Look for Boost. If version is given, it must either be a literal of the form
107 # "X.Y.Z" where X, Y and Z are integers (the ".Z" part being optional) or a
109 # Defines the value BOOST_CPPFLAGS. This macro only checks for headers with
110 # the required version, it does not check for any of the Boost libraries.
111 # On # success, defines HAVE_BOOST. On failure, calls the optional
112 # ACTION-IF-NOT-FOUND action if one was supplied.
113 # Otherwise aborts with an error message.
114 AC_DEFUN_ONCE([BOOST_REQUIRE],
115 [AC_REQUIRE([AC_PROG_CXX])dnl
116 AC_REQUIRE([AC_PROG_GREP])dnl
117 echo "$as_me: this is boost.m4[]_BOOST_SERIAL" >&AS_MESSAGE_LOG_FD
121 set x $boost_version_req 0 0 0
124 boost_version_req=`expr "$[1]" '*' 100000 + "$[2]" '*' 100 + "$[3]"`
125 boost_version_req_string=$[1].$[2].$[3]
127 [AS_HELP_STRING([--with-boost=DIR],
128 [prefix of Boost $1 @<:@guess@:>@])])dnl
129 AC_ARG_VAR([BOOST_ROOT],[Location of Boost installation])dnl
130 # If BOOST_ROOT is set and the user has not provided a value to
131 # --with-boost, then treat BOOST_ROOT as if it the user supplied it.
132 if test x"$BOOST_ROOT" != x; then
133 if test x"$with_boost" = x; then
134 AC_MSG_NOTICE([Detected BOOST_ROOT; continuing with --with-boost=$BOOST_ROOT])
135 with_boost=$BOOST_ROOT
137 AC_MSG_NOTICE([Detected BOOST_ROOT=$BOOST_ROOT, but overridden by --with-boost=$with_boost])
140 AC_SUBST([DISTCHECK_CONFIGURE_FLAGS],
141 ["$DISTCHECK_CONFIGURE_FLAGS '--with-boost=$with_boost'"])dnl
142 boost_save_CPPFLAGS=$CPPFLAGS
143 AC_CACHE_CHECK([for Boost headers version >= $boost_version_req_string],
145 [boost_cv_inc_path=no
146 AC_LANG_PUSH([C++])dnl
147 m4_pattern_allow([^BOOST_VERSION$])dnl
148 AC_LANG_CONFTEST([AC_LANG_PROGRAM([[#include <boost/version.hpp>
149 #if !defined BOOST_VERSION
150 # error BOOST_VERSION is not defined
151 #elif BOOST_VERSION < $boost_version_req
152 # error Boost headers version < $boost_version_req
155 # If the user provided a value to --with-boost, use it and only it.
156 case $with_boost in #(
157 ''|yes) set x '' /opt/local/include /usr/local/include /opt/include \
158 /usr/include C:/Boost/include;; #(
159 *) set x "$with_boost/include" "$with_boost";;
164 # Without --layout=system, Boost (or at least some versions) installs
165 # itself in <prefix>/include/boost-<version>. This inner loop helps to
166 # find headers in such directories.
168 # Any ${boost_dir}/boost-x_xx directories are searched in reverse version
169 # order followed by ${boost_dir}. The final '.' is a sentinel for
170 # searching $boost_dir" itself. Entries are whitespace separated.
172 # I didn't indent this loop on purpose (to avoid over-indented code)
173 boost_layout_system_search_list=`cd "$boost_dir" 2>/dev/null \
174 && ls -1 | "${GREP}" '^boost-' | sort -rn -t- -k2 \
176 for boost_inc in $boost_layout_system_search_list
178 if test x"$boost_inc" != x.; then
179 boost_inc="$boost_dir/$boost_inc"
181 boost_inc="$boost_dir" # Uses sentinel in boost_layout_system_search_list
183 if test x"$boost_inc" != x; then
184 # We are going to check whether the version of Boost installed
185 # in $boost_inc is usable by running a compilation that
186 # #includes it. But if we pass a -I/some/path in which Boost
187 # is not installed, the compiler will just skip this -I and
188 # use other locations (either from CPPFLAGS, or from its list
189 # of system include directories). As a result we would use
190 # header installed on the machine instead of the /some/path
191 # specified by the user. So in that precise case (trying
192 # $boost_inc), make sure the version.hpp exists.
194 # Use test -e as there can be symlinks.
195 test -e "$boost_inc/boost/version.hpp" || continue
196 CPPFLAGS="$CPPFLAGS -I$boost_inc"
198 AC_COMPILE_IFELSE([], [boost_cv_inc_path=yes], [boost_cv_version=no])
199 if test x"$boost_cv_inc_path" = xyes; then
200 if test x"$boost_inc" != x; then
201 boost_cv_inc_path=$boost_inc
207 AC_LANG_POP([C++])dnl
209 case $boost_cv_inc_path in #(
211 boost_errmsg="cannot find Boost headers version >= $boost_version_req_string"
212 m4_if([$2], [], [AC_MSG_ERROR([$boost_errmsg])],
213 [AC_MSG_NOTICE([$boost_errmsg])])
220 AC_SUBST([BOOST_CPPFLAGS], ["-I$boost_cv_inc_path"])dnl
223 if test x"$boost_cv_inc_path" != xno; then
224 AC_DEFINE([HAVE_BOOST], [1],
225 [Defined if the requested minimum BOOST version is satisfied])
226 AC_CACHE_CHECK([for Boost's header version],
227 [boost_cv_lib_version],
228 [m4_pattern_allow([^BOOST_LIB_VERSION$])dnl
229 _BOOST_SED_CPP([[/^boost-lib-version = /{s///;s/[\" ]//g;p;q;}]],
230 [#include <boost/version.hpp>
231 boost-lib-version = BOOST_LIB_VERSION],
232 [boost_cv_lib_version=`cat conftest.i`])])
233 # e.g. "134" for 1_34_1 or "135" for 1_35
234 boost_major_version=`echo "$boost_cv_lib_version" | sed 's/_//;s/_.*//'`
235 case $boost_major_version in #(
237 AC_MSG_ERROR([invalid value: boost_major_version='$boost_major_version'])
241 CPPFLAGS=$boost_save_CPPFLAGS
247 # Add the "--enable-static-boost" configure argument. If this argument is given
248 # on the command line, static versions of the libraries will be looked up.
249 AC_DEFUN([BOOST_STATIC],
250 [AC_ARG_ENABLE([static-boost],
251 [AS_HELP_STRING([--enable-static-boost],
252 [Prefer the static boost libraries over the shared ones [no]])],
253 [enable_static_boost=yes],
254 [enable_static_boost=no])])# BOOST_STATIC
257 # BOOST_FIND_HEADER([HEADER-NAME], [ACTION-IF-NOT-FOUND], [ACTION-IF-FOUND])
258 # --------------------------------------------------------------------------
259 # Wrapper around AC_CHECK_HEADER for Boost headers. Useful to check for
260 # some parts of the Boost library which are only made of headers and don't
261 # require linking (such as Boost.Foreach).
263 # Default ACTION-IF-NOT-FOUND: Fail with a fatal error unless Boost couldn't be
264 # found in the first place, in which case by default a notice is issued to the
265 # user. Presumably if we haven't died already it's because it's OK to not have
266 # Boost, which is why only a notice is issued instead of a hard error.
268 # Default ACTION-IF-FOUND: define the preprocessor symbol HAVE_<HEADER-NAME> in
269 # case of success # (where HEADER-NAME is written LIKE_THIS, e.g.,
270 # HAVE_BOOST_FOREACH_HPP).
271 AC_DEFUN([BOOST_FIND_HEADER],
272 [AC_REQUIRE([BOOST_REQUIRE])dnl
273 if test x"$boost_cv_inc_path" = xno; then
274 m4_default([$2], [AC_MSG_NOTICE([Boost not available, not searching for $1])])
276 AC_LANG_PUSH([C++])dnl
277 boost_save_CPPFLAGS=$CPPFLAGS
278 CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
279 AC_CHECK_HEADER([$1],
280 [m4_default([$3], [AC_DEFINE(AS_TR_CPP([HAVE_$1]), [1],
281 [Define to 1 if you have <$1>])])],
282 [m4_default([$2], [AC_MSG_ERROR([cannot find $1])])])
283 CPPFLAGS=$boost_save_CPPFLAGS
284 AC_LANG_POP([C++])dnl
286 ])# BOOST_FIND_HEADER
289 # BOOST_FIND_LIBS([COMPONENT-NAME], [CANDIDATE-LIB-NAMES],
290 # [PREFERRED-RT-OPT], [HEADER-NAME], [CXX-TEST],
292 # --------------------------------------------------------------
293 # Look for the Boost library COMPONENT-NAME (e.g., `thread', for
294 # libboost_thread) under the possible CANDIDATE-LIB-NAMES (e.g.,
295 # "thread_win32 thread"). Check that HEADER-NAME works and check that
296 # libboost_LIB-NAME can link with the code CXX-TEST. The optional
297 # argument CXX-PROLOGUE can be used to include some C++ code before
298 # the `main' function.
300 # Invokes BOOST_FIND_HEADER([HEADER-NAME]) (see above).
302 # Boost libraries typically come compiled with several flavors (with different
303 # runtime options) so PREFERRED-RT-OPT is the preferred suffix. A suffix is one
304 # or more of the following letters: sgdpn (in that order). s = static
305 # runtime, d = debug build, g = debug/diagnostic runtime, p = STLPort build,
306 # n = (unsure) STLPort build without iostreams from STLPort (it looks like `n'
307 # must always be used along with `p'). Additionally, PREFERRED-RT-OPT can
308 # start with `mt-' to indicate that there is a preference for multi-thread
309 # builds. Some sample values for PREFERRED-RT-OPT: (nothing), mt, d, mt-d, gdp
310 # ... If you want to make sure you have a specific version of Boost
311 # (eg, >= 1.33) you *must* invoke BOOST_REQUIRE before this macro.
312 AC_DEFUN([BOOST_FIND_LIBS],
313 [AC_REQUIRE([BOOST_REQUIRE])dnl
314 AC_REQUIRE([_BOOST_FIND_COMPILER_TAG])dnl
315 AC_REQUIRE([BOOST_STATIC])dnl
316 AC_REQUIRE([_BOOST_GUESS_WHETHER_TO_USE_MT])dnl
317 if test x"$boost_cv_inc_path" = xno; then
318 AC_MSG_NOTICE([Boost not available, not searching for the Boost $1 library])
320 dnl The else branch is huge and wasn't indented on purpose.
321 AC_LANG_PUSH([C++])dnl
322 AS_VAR_PUSHDEF([Boost_lib], [boost_cv_lib_$1])dnl
323 AS_VAR_PUSHDEF([Boost_lib_LDFLAGS], [boost_cv_lib_$1_LDFLAGS])dnl
324 AS_VAR_PUSHDEF([Boost_lib_LDPATH], [boost_cv_lib_$1_LDPATH])dnl
325 AS_VAR_PUSHDEF([Boost_lib_LIBS], [boost_cv_lib_$1_LIBS])dnl
326 BOOST_FIND_HEADER([$4])
327 boost_save_CPPFLAGS=$CPPFLAGS
328 CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
329 AC_CACHE_CHECK([for the Boost $1 library], [Boost_lib],
330 [_BOOST_FIND_LIBS($@)])
331 case $Boost_lib in #(
332 (yes) _AC_MSG_LOG_CONFTEST
333 AC_DEFINE(AS_TR_CPP([HAVE_BOOST_$1]), [1], [Defined if the Boost $1 library is available])dnl
334 AC_SUBST(AS_TR_CPP([BOOST_$1_LDFLAGS]), [$Boost_lib_LDFLAGS])dnl
335 AC_SUBST(AS_TR_CPP([BOOST_$1_LDPATH]), [$Boost_lib_LDPATH])dnl
336 AC_SUBST([BOOST_LDPATH], [$Boost_lib_LDPATH])dnl
337 AC_SUBST(AS_TR_CPP([BOOST_$1_LIBS]), [$Boost_lib_LIBS])dnl
339 (no) _AC_MSG_LOG_CONFTEST
340 AC_MSG_ERROR([cannot find flags to link with the Boost $1 library (libboost-$1)])
343 CPPFLAGS=$boost_save_CPPFLAGS
344 AS_VAR_POPDEF([Boost_lib])dnl
345 AS_VAR_POPDEF([Boost_lib_LDFLAGS])dnl
346 AS_VAR_POPDEF([Boost_lib_LDPATH])dnl
347 AS_VAR_POPDEF([Boost_lib_LIBS])dnl
348 AC_LANG_POP([C++])dnl
353 # BOOST_FIND_LIB([LIB-NAME],
354 # [PREFERRED-RT-OPT], [HEADER-NAME], [CXX-TEST],
356 # --------------------------------------------------------------
357 # Backward compatibility wrapper for BOOST_FIND_LIBS.
358 AC_DEFUN([BOOST_FIND_LIB],
359 [BOOST_FIND_LIBS([$1], $@)])
362 # _BOOST_FIND_LIBS([LIB-NAME], [CANDIDATE-LIB-NAMES],
363 # [PREFERRED-RT-OPT], [HEADER-NAME], [CXX-TEST],
365 # --------------------------------------------------------------
366 # Real implementation of BOOST_FIND_LIBS: rely on these local macros:
367 # Boost_lib, Boost_lib_LDFLAGS, Boost_lib_LDPATH, Boost_lib_LIBS
369 # The algorithm is as follows: first look for a given library name
370 # according to the user's PREFERRED-RT-OPT. For each library name, we
371 # prefer to use the ones that carry the tag (toolset name). Each
372 # library is searched through the various standard paths were Boost is
373 # usually installed. If we can't find the standard variants, we try
374 # to enforce -mt (for instance on MacOSX, libboost_thread.dylib
375 # doesn't exist but there's -obviously- libboost_thread-mt.dylib).
376 AC_DEFUN([_BOOST_FIND_LIBS],
379 (mt | mt-) boost_mt=-mt; boost_rtopt=;; #(
380 (mt* | mt-*) boost_mt=-mt; boost_rtopt=`expr "X$3" : 'Xmt-*\(.*\)'`;; #(
381 (*) boost_mt=; boost_rtopt=$3;;
383 if test $enable_static_boost = yes; then
384 boost_rtopt="s$boost_rtopt"
386 # Find the proper debug variant depending on what we've been asked to find.
387 case $boost_rtopt in #(
388 (*d*) boost_rt_d=$boost_rtopt;; #(
389 (*[[sgpn]]*) # Insert the `d' at the right place (in between `sg' and `pn')
390 boost_rt_d=`echo "$boost_rtopt" | sed 's/\(s*g*\)\(p*n*\)/\1\2/'`;; #(
391 (*) boost_rt_d='-d';;
393 # If the PREFERRED-RT-OPT are not empty, prepend a `-'.
394 test -n "$boost_rtopt" && boost_rtopt="-$boost_rtopt"
395 $boost_guess_use_mt && boost_mt=-mt
396 # Look for the abs path the static archive.
397 # $libext is computed by Libtool but let's make sure it's non empty.
399 AC_MSG_ERROR([the libext variable is empty, did you invoke Libtool?])
400 boost_save_ac_objext=$ac_objext
401 # Generate the test file.
402 AC_LANG_CONFTEST([AC_LANG_PROGRAM([$7
405 dnl Optimization hacks: compiling C++ is slow, especially with Boost. What
406 dnl we're trying to do here is guess the right combination of link flags
407 dnl (LIBS / LDFLAGS) to use a given library. This can take several
408 dnl iterations before it succeeds and is thus *very* slow. So what we do
409 dnl instead is that we compile the code first (and thus get an object file,
410 dnl typically conftest.o). Then we try various combinations of link flags
411 dnl until we succeed to link conftest.o in an executable. The problem is
412 dnl that the various TRY_LINK / COMPILE_IFELSE macros of Autoconf always
413 dnl remove all the temporary files including conftest.o. So the trick here
414 dnl is to temporarily change the value of ac_objext so that conftest.o is
415 dnl preserved accross tests. This is obviously fragile and I will burn in
416 dnl hell for not respecting Autoconf's documented interfaces, but in the
417 dnl mean time, it optimizes the macro by a factor of 5 to 30.
418 dnl Another small optimization: the first argument of AC_COMPILE_IFELSE left
419 dnl empty because the test file is generated only once above (before we
420 dnl start the for loops).
421 AC_COMPILE_IFELSE([],
422 [ac_objext=do_not_rm_me_plz],
423 [AC_MSG_ERROR([cannot compile a test that uses Boost $1])])
424 ac_objext=$boost_save_ac_objext
426 # Don't bother to ident the following nested for loops, only the 2
427 # innermost ones matter.
428 for boost_lib_ in $2; do
429 for boost_tag_ in -$boost_cv_lib_tag ''; do
430 for boost_ver_ in -$boost_cv_lib_version ''; do
431 for boost_mt_ in $boost_mt -mt ''; do
432 for boost_rtopt_ in $boost_rtopt '' -d; do
433 for boost_full_suffix in \
435 x$boost_tag_$boost_mt_$boost_rtopt_$boost_ver_ \
436 x$boost_tag_$boost_rtopt_$boost_ver_ \
437 x$boost_tag_$boost_mt_$boost_ver_ \
438 x$boost_tag_$boost_ver_
440 boost_real_suffix=`echo "$boost_full_suffix" | sed 's/^x//'`
441 boost_lib="boost_$boost_lib_$boost_real_suffix"
442 # Avoid testing twice the same lib
443 case $boost_failed_libs in #(
444 (*@$boost_lib@*) continue;;
446 # If with_boost is empty, we'll search in /lib first, which is not quite
447 # right so instead we'll try to a location based on where the headers are.
448 boost_tmp_lib=$with_boost
449 test x"$with_boost" = x && boost_tmp_lib=${boost_cv_inc_path%/include}
450 for boost_ldpath in "$boost_tmp_lib/lib" '' \
451 /opt/local/lib* /usr/local/lib* /opt/lib* /usr/lib* \
452 "$with_boost" C:/Boost/lib /lib*
454 # Don't waste time with directories that don't exist.
455 if test x"$boost_ldpath" != x && test ! -e "$boost_ldpath"; then
458 boost_save_LDFLAGS=$LDFLAGS
459 # Are we looking for a static library?
460 case $boost_ldpath:$boost_rtopt_ in #(
461 (*?*:*s*) # Yes (Non empty boost_ldpath + s in rt opt)
462 Boost_lib_LIBS="$boost_ldpath/lib$boost_lib.$libext"
463 test -e "$Boost_lib_LIBS" || continue;; #(
464 (*) # No: use -lboost_foo to find the shared library.
465 Boost_lib_LIBS="-l$boost_lib";;
467 boost_save_LIBS=$LIBS
468 LIBS="$Boost_lib_LIBS $LIBS"
469 test x"$boost_ldpath" != x && LDFLAGS="$LDFLAGS -L$boost_ldpath"
470 dnl First argument of AC_LINK_IFELSE left empty because the test file is
471 dnl generated only once above (before we start the for loops).
472 _BOOST_AC_LINK_IFELSE([],
473 [Boost_lib=yes], [Boost_lib=no])
474 ac_objext=$boost_save_ac_objext
475 LDFLAGS=$boost_save_LDFLAGS
476 LIBS=$boost_save_LIBS
477 if test x"$Boost_lib" = xyes; then
478 # Check or used cached result of whether or not using -R or
479 # -rpath makes sense. Some implementations of ld, such as for
480 # Mac OSX, require -rpath but -R is the flag known to work on
481 # other systems. https://github.com/tsuna/boost.m4/issues/19
482 AC_CACHE_VAL([boost_cv_rpath_link_ldflag],
483 [case $boost_ldpath in
485 boost_cv_rpath_link_ldflag=
486 boost_rpath_link_ldflag_found=yes;;
488 for boost_cv_rpath_link_ldflag in -Wl,-R, -Wl,-rpath,; do
489 LDFLAGS="$boost_save_LDFLAGS -L$boost_ldpath $boost_cv_rpath_link_ldflag$boost_ldpath"
490 LIBS="$Boost_lib_LIBS $boost_save_LIBS"
491 _BOOST_AC_LINK_IFELSE([],
492 [boost_rpath_link_ldflag_found=yes
494 [boost_rpath_link_ldflag_found=no])
498 AS_IF([test "x$boost_rpath_link_ldflag_found" != "xyes"],
499 [AC_MSG_ERROR([Unable to determine whether to use -R or -rpath])])
500 LDFLAGS=$boost_save_LDFLAGS
501 LIBS=$boost_save_LIBS
503 test x"$boost_ldpath" != x &&
504 Boost_lib_LDFLAGS="-L$boost_ldpath $boost_cv_rpath_link_ldflag$boost_ldpath"
505 Boost_lib_LDPATH="$boost_ldpath"
506 boost_last_suffix="$boost_full_suffix"
509 boost_failed_libs="$boost_failed_libs@$boost_lib@"
518 rm -f conftest.$ac_objext
523 # --------------------------------------- #
524 # Checks for the various Boost libraries. #
525 # --------------------------------------- #
527 # List of boost libraries: http://www.boost.org/libs/libraries.htm
528 # The page http://beta.boost.org/doc/libs is useful: it gives the first release
529 # version of each library (among other things).
531 # BOOST_DEFUN(LIBRARY, CODE)
532 # --------------------------
533 # Define BOOST_<LIBRARY-UPPERCASE> as a macro that runs CODE.
535 # Use indir to avoid the warning on underquoted macro name given to AC_DEFUN.
536 m4_define([BOOST_DEFUN],
537 [m4_indir([AC_DEFUN],
538 m4_toupper([BOOST_$1]),
539 [m4_pushdef([BOOST_Library], [$1])dnl
541 m4_popdef([BOOST_Library])dnl
550 [BOOST_FIND_HEADER([boost/any.hpp])])
555 # Look for Boost.Array
557 [BOOST_FIND_HEADER([boost/array.hpp])])
562 # Look for Boost.Asio (new in Boost 1.35).
564 [AC_REQUIRE([BOOST_SYSTEM])dnl
565 BOOST_FIND_HEADER([boost/asio.hpp])])
569 # Look for Boost.Bimap
571 [BOOST_FIND_HEADER([boost/bimap.hpp])])
576 # Look for Boost.Assign
577 BOOST_DEFUN([Assign],
578 [BOOST_FIND_HEADER([boost/assign.hpp])])
581 # BOOST_ATOMIC([PREFERRED-RT-OPT])
582 # -------------------------------
583 # Look for Boost.Atomic. For the documentation of PREFERRED-RT-OPT, see the
584 # documentation of BOOST_FIND_LIB above.
585 BOOST_DEFUN([Atomic],
586 [BOOST_FIND_LIB([atomic], [$1],
588 [boost::atomic<int> a;],
590 [#ifdef HAVE_UNISTD_H
601 # Look for Boost.Bind.
603 [BOOST_FIND_HEADER([boost/bind.hpp])])
608 # Look for Boost.Cast
610 [BOOST_FIND_HEADER([boost/cast.hpp])])
615 # Look for Boost.Chrono.
616 BOOST_DEFUN([Chrono],
617 [# Do we have to check for Boost.System? This link-time dependency was
618 # added as of 1.35.0. If we have a version <1.35, we must not attempt to
619 # find Boost.System as it didn't exist by then.
620 if test $boost_major_version -ge 135; then
622 fi # end of the Boost.System check.
623 boost_filesystem_save_LIBS=$LIBS
624 boost_filesystem_save_LDFLAGS=$LDFLAGS
625 m4_pattern_allow([^BOOST_SYSTEM_(LIBS|LDFLAGS)$])dnl
626 LIBS="$LIBS $BOOST_SYSTEM_LIBS"
627 LDFLAGS="$LDFLAGS $BOOST_SYSTEM_LDFLAGS"
628 BOOST_FIND_LIB([chrono], [$1],
630 [boost::chrono::thread_clock d;])
631 if test $enable_static_boost = yes && test $boost_major_version -ge 135; then
632 BOOST_CHRONO_LIBS="$BOOST_CHRONO_LIBS $BOOST_SYSTEM_LIBS"
634 LIBS=$boost_filesystem_save_LIBS
635 LDFLAGS=$boost_filesystem_save_LDFLAGS
639 # BOOST_CONTEXT([PREFERRED-RT-OPT])
640 # -----------------------------------
641 # Look for Boost.Context. For the documentation of PREFERRED-RT-OPT, see the
642 # documentation of BOOST_FIND_LIB above.
644 # * This library was introduced in Boost 1.51.0
645 # * The signatures of make_fcontext() and jump_fcontext were changed in 1.56.0
646 # * A dependency on boost_thread appears in 1.57.0
647 # * The implementation details were moved to boost::context::detail in 1.61.0
648 BOOST_DEFUN([Context],
649 [boost_context_save_LIBS=$LIBS
650 boost_context_save_LDFLAGS=$LDFLAGS
651 if test $boost_major_version -ge 157; then
653 m4_pattern_allow([^BOOST_THREAD_(LIBS|LDFLAGS)$])dnl
654 LIBS="$LIBS $BOOST_THREAD_LIBS"
655 LDFLAGS="$LDFLAGS $BOOST_THREAD_LDFLAGS"
658 if test $boost_major_version -ge 161; then
659 BOOST_FIND_LIB([context], [$1],
660 [boost/context/continuation.hpp], [[
661 namespace ctx=boost::context;
663 ctx::continuation source=ctx::callcc(
664 [&a](ctx::continuation && sink){
673 return std::move(sink);
675 for (int j=0;j<10;++j) {
676 source=source.resume();
683 BOOST_FIND_LIB([context], [$1],
684 [boost/context/fcontext.hpp],[[
687 void * stack_pointer = new void*[4096];
688 std::size_t const size = sizeof(void*[4096]);
690 #if BOOST_VERSION <= 105100
691 ctx::make_fcontext(&fc, f);
692 return ctx::jump_fcontext(&fcm, &fc, 3) == 6;
696 fc = ctx::make_fcontext(stack_pointer, size, f);
697 return ctx::jump_fcontext(&fcm, fc, 3) == 6;
704 #include <boost/version.hpp>
705 #if BOOST_VERSION <= 105100
707 namespace ctx = boost::ctx;
709 static ctx::fcontext_t fcm, fc;
711 static void f(intptr_t i) {
712 ctx::jump_fcontext(&fc, &fcm, i * 2);
715 #elif BOOST_VERSION <= 105500
717 namespace ctx = boost::context;
720 static ctx::fcontext_t fcm, *fc;
723 static void f(intptr_t i) {
724 ctx::jump_fcontext(fc, &fcm, i * 2);
729 namespace ctx = boost::context;
732 static ctx::fcontext_t fcm, fc;
735 static void f(intptr_t i) {
736 ctx::jump_fcontext(&fc, fcm, i * 2);
743 LIBS=$boost_context_save_LIBS
744 LDFLAGS=$boost_context_save_LDFLAGS
750 # Look for Boost.Conversion (cast / lexical_cast)
751 BOOST_DEFUN([Conversion],
752 [BOOST_FIND_HEADER([boost/cast.hpp])
753 BOOST_FIND_HEADER([boost/lexical_cast.hpp])
757 # BOOST_COROUTINE([PREFERRED-RT-OPT])
758 # -----------------------------------
759 # Look for Boost.Coroutine. For the documentation of PREFERRED-RT-OPT, see the
760 # documentation of BOOST_FIND_LIB above. This library was introduced in Boost
762 BOOST_DEFUN([Coroutine],
764 boost_coroutine_save_LIBS=$LIBS
765 boost_coroutine_save_LDFLAGS=$LDFLAGS
766 # Link-time dependency from coroutine to context
768 # Starting from Boost 1.55 a dependency on Boost.System is added
769 if test $boost_major_version -ge 155; then
772 m4_pattern_allow([^BOOST_(CONTEXT|SYSTEM)_(LIBS|LDFLAGS)])
773 LIBS="$LIBS $BOOST_CONTEXT_LIBS $BOOST_SYSTEM_LIBS"
774 LDFLAGS="$LDFLAGS $BOOST_CONTEXT_LDFLAGS"
776 # in 1.53 coroutine was a header only library
777 if test $boost_major_version -eq 153; then
778 BOOST_FIND_HEADER([boost/coroutine/coroutine.hpp])
780 BOOST_FIND_LIB([coroutine], [$1],
781 [boost/coroutine/coroutine.hpp],
783 #include <boost/version.hpp>
784 #if BOOST_VERSION <= 105500
785 boost::coroutines::coroutine<int(int)> coro; coro.get();
787 boost::coroutines::asymmetric_coroutine<int>::pull_type coro; coro.get();
791 # Link-time dependency from coroutine to context, existed only in 1.53, in 1.54
792 # coroutine doesn't use context from its headers but from its library.
793 if test $boost_major_version -eq 153 || test $enable_static_boost = yes && test $boost_major_version -ge 154; then
794 BOOST_COROUTINE_LIBS="$BOOST_COROUTINE_LIBS $BOOST_CONTEXT_LIBS"
795 BOOST_COROUTINE_LDFLAGS="$BOOST_COROUTINE_LDFLAGS $BOOST_CONTEXT_LDFLAGS"
797 if test $enable_static_boost = yes && test $boost_major_version -ge 155; then
798 BOOST_COROUTINE_LIBS="$BOOST_COROUTINE_LIBS $BOOST_SYSTEM_LIBS"
799 BOOST_COROUTINE_LDFLAGS="$BOOST_COROUTINE_LDFLAGS $BOOST_SYSTEM_LDFLAGS"
801 LIBS=$boost_coroutine_save_LIBS
802 LDFLAGS=$boost_coroutine_save_LDFLAGS
810 [BOOST_FIND_HEADER([boost/crc.hpp])
814 # BOOST_DATE_TIME([PREFERRED-RT-OPT])
815 # -----------------------------------
816 # Look for Boost.Date_Time. For the documentation of PREFERRED-RT-OPT, see the
817 # documentation of BOOST_FIND_LIB above.
818 BOOST_DEFUN([Date_Time],
819 [BOOST_FIND_LIB([date_time], [$1],
820 [boost/date_time/posix_time/posix_time.hpp],
821 [boost::posix_time::ptime t;])
827 # Look for Boost.Exception
828 BOOST_DEFUN([Exception],
829 [BOOST_FIND_HEADER([boost/exception/all.hpp])])
832 # BOOST_FILESYSTEM([PREFERRED-RT-OPT])
833 # ------------------------------------
834 # Look for Boost.Filesystem. For the documentation of PREFERRED-RT-OPT, see
835 # the documentation of BOOST_FIND_LIB above.
836 # Do not check for boost/filesystem.hpp because this file was introduced in
838 BOOST_DEFUN([Filesystem],
839 [# Do we have to check for Boost.System? This link-time dependency was
840 # added as of 1.35.0. If we have a version <1.35, we must not attempt to
841 # find Boost.System as it didn't exist by then.
842 if test $boost_major_version -ge 135; then
844 fi # end of the Boost.System check.
845 boost_filesystem_save_LIBS=$LIBS
846 boost_filesystem_save_LDFLAGS=$LDFLAGS
847 m4_pattern_allow([^BOOST_SYSTEM_(LIBS|LDFLAGS)$])dnl
848 LIBS="$LIBS $BOOST_SYSTEM_LIBS"
849 LDFLAGS="$LDFLAGS $BOOST_SYSTEM_LDFLAGS"
850 BOOST_FIND_LIB([filesystem], [$1],
851 [boost/filesystem/path.hpp], [boost::filesystem::path p;])
852 if test $enable_static_boost = yes && test $boost_major_version -ge 135; then
853 BOOST_FILESYSTEM_LIBS="$BOOST_FILESYSTEM_LIBS $BOOST_SYSTEM_LIBS"
855 LIBS=$boost_filesystem_save_LIBS
856 LDFLAGS=$boost_filesystem_save_LDFLAGS
862 # Look for Boost.Flyweight.
863 BOOST_DEFUN([Flyweight],
864 [dnl There's a hidden dependency on pthreads.
865 AC_REQUIRE([_BOOST_PTHREAD_FLAG])dnl
866 BOOST_FIND_HEADER([boost/flyweight.hpp])
867 AC_SUBST([BOOST_FLYWEIGHT_LIBS], [$boost_cv_pthread_flag])
873 # Look for Boost.Foreach.
874 BOOST_DEFUN([Foreach],
875 [BOOST_FIND_HEADER([boost/foreach.hpp])])
880 # Look for Boost.Format.
881 # Note: we can't check for boost/format/format_fwd.hpp because the header isn't
882 # standalone. It can't be compiled because it triggers the following error:
883 # boost/format/detail/config_macros.hpp:88: error: 'locale' in namespace 'std'
884 # does not name a type
885 BOOST_DEFUN([Format],
886 [BOOST_FIND_HEADER([boost/format.hpp])])
891 # Look for Boost.Function
892 BOOST_DEFUN([Function],
893 [BOOST_FIND_HEADER([boost/function.hpp])])
898 # Look for Boost.Fusion
899 BOOST_DEFUN([Fusion],
900 [BOOST_FIND_HEADER([boost/fusion/sequence.hpp])])
905 # Look for Boost.Geometry (new since 1.47.0).
906 BOOST_DEFUN([Geometry],
907 [BOOST_FIND_HEADER([boost/geometry.hpp])
911 # BOOST_GRAPH([PREFERRED-RT-OPT])
912 # -------------------------------
913 # Look for Boost.Graphs. For the documentation of PREFERRED-RT-OPT, see the
914 # documentation of BOOST_FIND_LIB above.
916 [boost_graph_save_LIBS=$LIBS
917 boost_graph_save_LDFLAGS=$LDFLAGS
918 # Link-time dependency from graph to regex was added as of 1.40.0.
919 if test $boost_major_version -ge 140; then
921 m4_pattern_allow([^BOOST_REGEX_(LIBS|LDFLAGS)$])dnl
922 LIBS="$LIBS $BOOST_REGEX_LIBS"
923 LDFLAGS="$LDFLAGS $BOOST_REGEX_LDFLAGS"
925 BOOST_FIND_LIB([graph], [$1],
926 [boost/graph/adjacency_list.hpp], [boost::adjacency_list<> g;])
927 LIBS=$boost_graph_save_LIBS
928 LDFLAGS=$boost_graph_save_LDFLAGS
934 # Look for Boost.Functional/Hash
936 [BOOST_FIND_HEADER([boost/functional/hash.hpp])])
939 # BOOST_IOSTREAMS([PREFERRED-RT-OPT])
940 # -----------------------------------
941 # Look for Boost.IOStreams. For the documentation of PREFERRED-RT-OPT, see the
942 # documentation of BOOST_FIND_LIB above.
943 BOOST_DEFUN([IOStreams],
944 [BOOST_FIND_LIB([iostreams], [$1],
945 [boost/iostreams/device/file_descriptor.hpp],
946 [boost::iostreams::file_descriptor fd; fd.close();])
952 # Look for Boost.Iterator
953 BOOST_DEFUN([Iterator],
954 [BOOST_FIND_HEADER([boost/iterator/iterator_adaptor.hpp])])
959 # Look for Boost.Lambda
960 BOOST_DEFUN([Lambda],
961 [BOOST_FIND_HEADER([boost/lambda/lambda.hpp])])
966 # Look for Boost.Locale
967 BOOST_DEFUN([Locale],
969 boost_locale_save_LIBS=$LIBS
970 boost_locale_save_LDFLAGS=$LDFLAGS
971 # require SYSTEM for boost-1.50.0 and up
972 if test $boost_major_version -ge 150; then
974 m4_pattern_allow([^BOOST_SYSTEM_(LIBS|LDFLAGS)$])dnl
975 LIBS="$LIBS $BOOST_SYSTEM_LIBS"
976 LDFLAGS="$LDFLAGS $BOOST_SYSTEM_LDFLAGS"
977 fi # end of the Boost.System check.
978 BOOST_FIND_LIB([locale], [$1],
980 [[boost::locale::generator gen; std::locale::global(gen(""));]])
981 LIBS=$boost_locale_save_LIBS
982 LDFLAGS=$boost_locale_save_LDFLAGS
985 # BOOST_LOG([PREFERRED-RT-OPT])
986 # -----------------------------
987 # Look for Boost.Log. For the documentation of PREFERRED-RT-OPT, see the
988 # documentation of BOOST_FIND_LIB above.
990 [boost_log_save_LIBS=$LIBS
991 boost_log_save_LDFLAGS=$LDFLAGS
993 BOOST_FILESYSTEM([$1])
994 BOOST_DATE_TIME([$1])
995 m4_pattern_allow([^BOOST_(SYSTEM|FILESYSTEM|DATE_TIME)_(LIBS|LDFLAGS)$])dnl
996 LIBS="$LIBS $BOOST_DATE_TIME_LIBS $BOOST_FILESYSTEM_LIBS $BOOST_SYSTEM_LIBS"
997 LDFLAGS="$LDFLAGS $BOOST_DATE_TIME_LDFLAGS $BOOST_FILESYSTEM_LDFLAGS $BOOST_SYSTEM_LDFLAGS"
998 BOOST_FIND_LIB([log], [$1],
999 [boost/log/core/core.hpp],
1000 [boost::log::attribute a; a.get_value();])
1001 LIBS=$boost_log_save_LIBS
1002 LDFLAGS=$boost_log_save_LDFLAGS
1006 # BOOST_LOG_SETUP([PREFERRED-RT-OPT])
1007 # -----------------------------------
1008 # Look for Boost.Log. For the documentation of PREFERRED-RT-OPT, see the
1009 # documentation of BOOST_FIND_LIB above.
1010 BOOST_DEFUN([Log_Setup],
1011 [boost_log_setup_save_LIBS=$LIBS
1012 boost_log_setup_save_LDFLAGS=$LDFLAGS
1014 m4_pattern_allow([^BOOST_LOG_(LIBS|LDFLAGS)$])dnl
1015 LIBS="$LIBS $BOOST_LOG_LIBS"
1016 LDFLAGS="$LDFLAGS $BOOST_LOG_LDFLAGS"
1017 BOOST_FIND_LIB([log_setup], [$1],
1018 [boost/log/utility/setup/from_settings.hpp],
1019 [boost::log::basic_settings<char> bs; bs.empty();])
1020 LIBS=$boost_log_setup_save_LIBS
1021 LDFLAGS=$boost_log_setup_save_LDFLAGS
1027 # Look for Boost.Math
1028 # TODO: This library isn't header-only but it comes in multiple different
1029 # flavors that don't play well with BOOST_FIND_LIB (e.g, libboost_math_c99,
1030 # libboost_math_c99f, libboost_math_c99l, libboost_math_tr1,
1031 # libboost_math_tr1f, libboost_math_tr1l). This macro must be fixed to do the
1032 # right thing anyway.
1034 [BOOST_FIND_HEADER([boost/math/special_functions.hpp])])
1037 # BOOST_MPI([PREFERRED-RT-OPT])
1038 # -------------------------------
1039 # Look for Boost MPI. For the documentation of PREFERRED-RT-OPT, see the
1040 # documentation of BOOST_FIND_LIB above. Uses MPICXX variable if it is
1041 # set, otherwise tries CXX
1044 [boost_save_CXX=${CXX}
1045 boost_save_CXXCPP=${CXXCPP}
1046 if test x"${MPICXX}" != x; then
1048 CXXCPP="${MPICXX} -E"
1050 BOOST_FIND_LIB([mpi], [$1],
1054 boost::mpi::environment env(argc,argv);])
1055 CXX=${boost_save_CXX}
1056 CXXCPP=${boost_save_CXXCPP}
1061 # ------------------
1062 # Look for Boost.MPL
1064 [BOOST_FIND_HEADER([boost/mpl/for_each.hpp])])
1067 # BOOST_MULTIARRAY()
1068 # ------------------
1069 # Look for Boost.MultiArray
1070 BOOST_DEFUN([MultiArray],
1071 [BOOST_FIND_HEADER([boost/multi_array.hpp])])
1074 # BOOST_MULTIINDEXCCONTAINER()
1075 # ------------------
1076 # Look for Boost.MultiIndexContainer
1077 BOOST_DEFUN([MultiIndexContainer],
1078 [BOOST_FIND_HEADER([boost/multi_index_container.hpp])])
1081 # BOOST_NUMERIC_UBLAS()
1082 # --------------------------
1083 # Look for Boost.NumericUblas (Basic Linear Algebra)
1084 BOOST_DEFUN([Numeric_Ublas],
1085 [BOOST_FIND_HEADER([boost/numeric/ublas/vector.hpp])
1086 ])# BOOST_NUMERIC_UBLAS
1089 # BOOST_NUMERIC_CONVERSION()
1090 # --------------------------
1091 # Look for Boost.NumericConversion (policy-based numeric conversion)
1092 BOOST_DEFUN([Numeric_Conversion],
1093 [BOOST_FIND_HEADER([boost/numeric/conversion/converter.hpp])
1094 ])# BOOST_NUMERIC_CONVERSION
1099 # Look for Boost.Optional
1100 BOOST_DEFUN([Optional],
1101 [BOOST_FIND_HEADER([boost/optional.hpp])])
1104 # BOOST_PREPROCESSOR()
1105 # --------------------
1106 # Look for Boost.Preprocessor
1107 BOOST_DEFUN([Preprocessor],
1108 [BOOST_FIND_HEADER([boost/preprocessor/repeat.hpp])])
1111 # BOOST_PROPERTY_TREE([PREFERRED-RT-OPT])
1112 # -----------------------------------------
1113 # Look for Boost.Property_Tree. For the documentation of PREFERRED-RT-OPT,
1114 # see the documentation of BOOST_FIND_LIB above.
1115 BOOST_DEFUN([Property_Tree],
1116 [BOOST_FIND_LIB([property_tree], [$1],
1117 [boost/property_tree/ptree.hpp],
1118 [boost::property_tree::ptree pt; boost::property_tree::read_xml d("test", pt);])
1119 ])# BOOST_PROPERTY_TREE
1123 # --------------------
1124 # Look for Boost.Random
1125 BOOST_DEFUN([Random],
1126 [BOOST_FIND_HEADER([boost/random/random_number_generator.hpp])])
1130 # --------------------
1131 # Look for Boost.Range
1132 BOOST_DEFUN([Range],
1133 [BOOST_FIND_HEADER([boost/range/adaptors.hpp])])
1137 # Look for Boost.Unordered
1138 BOOST_DEFUN([Unordered],
1139 [BOOST_FIND_HEADER([boost/unordered_map.hpp])])
1144 # Look for Boost.Uuid
1146 [BOOST_FIND_HEADER([boost/uuid/uuid.hpp])])
1149 # BOOST_PROGRAM_OPTIONS([PREFERRED-RT-OPT])
1150 # -----------------------------------------
1151 # Look for Boost.Program_options. For the documentation of PREFERRED-RT-OPT,
1152 # see the documentation of BOOST_FIND_LIB above.
1153 BOOST_DEFUN([Program_Options],
1154 [BOOST_FIND_LIB([program_options], [$1],
1155 [boost/program_options.hpp],
1156 [boost::program_options::options_description d("test");])
1157 ])# BOOST_PROGRAM_OPTIONS
1161 # _BOOST_PYTHON_CONFIG(VARIABLE, FLAG)
1162 # ------------------------------------
1163 # Save VARIABLE, and define it via `python-config --FLAG`.
1164 # Substitute BOOST_PYTHON_VARIABLE.
1165 m4_define([_BOOST_PYTHON_CONFIG],
1166 [AC_SUBST([BOOST_PYTHON_$1],
1167 [`python-config --$2 2>/dev/null`])dnl
1168 boost_python_save_$1=$$1
1169 $1="$$1 $BOOST_PYTHON_$1"])
1172 # BOOST_PYTHON([PREFERRED-RT-OPT])
1173 # --------------------------------
1174 # Look for Boost.Python. For the documentation of PREFERRED-RT-OPT,
1175 # see the documentation of BOOST_FIND_LIB above.
1176 BOOST_DEFUN([Python],
1177 [_BOOST_PYTHON_CONFIG([CPPFLAGS], [includes])
1178 _BOOST_PYTHON_CONFIG([LDFLAGS], [ldflags])
1179 _BOOST_PYTHON_CONFIG([LIBS], [libs])
1180 m4_pattern_allow([^BOOST_PYTHON_MODULE$])dnl
1181 BOOST_FIND_LIBS([python], [python python3], [$1],
1183 [], [BOOST_PYTHON_MODULE(empty) {}])
1184 CPPFLAGS=$boost_python_save_CPPFLAGS
1185 LDFLAGS=$boost_python_save_LDFLAGS
1186 LIBS=$boost_python_save_LIBS
1192 # Look for Boost.Ref
1194 [BOOST_FIND_HEADER([boost/ref.hpp])])
1197 # BOOST_REGEX([PREFERRED-RT-OPT])
1198 # -------------------------------
1199 # Look for Boost.Regex. For the documentation of PREFERRED-RT-OPT, see the
1200 # documentation of BOOST_FIND_LIB above.
1201 BOOST_DEFUN([Regex],
1202 [BOOST_FIND_LIB([regex], [$1],
1204 [boost::regex exp("*"); boost::regex_match("foo", exp);])
1208 # BOOST_SERIALIZATION([PREFERRED-RT-OPT])
1209 # ---------------------------------------
1210 # Look for Boost.Serialization. For the documentation of PREFERRED-RT-OPT, see
1211 # the documentation of BOOST_FIND_LIB above.
1212 BOOST_DEFUN([Serialization],
1213 [BOOST_FIND_LIB([serialization], [$1],
1214 [boost/archive/text_oarchive.hpp],
1215 [std::ostream* o = 0; // Cheap way to get an ostream...
1216 boost::archive::text_oarchive t(*o);])
1217 ])# BOOST_SERIALIZATION
1220 # BOOST_SIGNALS([PREFERRED-RT-OPT])
1221 # ---------------------------------
1222 # Look for Boost.Signals. For the documentation of PREFERRED-RT-OPT, see the
1223 # documentation of BOOST_FIND_LIB above.
1224 BOOST_DEFUN([Signals],
1225 [BOOST_FIND_LIB([signals], [$1],
1227 [boost::signal<void ()> s;])
1233 # Look for Boost.Signals2 (new since 1.39.0).
1234 BOOST_DEFUN([Signals2],
1235 [BOOST_FIND_HEADER([boost/signals2.hpp])
1241 # Look for Boost.SmartPtr
1242 BOOST_DEFUN([Smart_Ptr],
1243 [BOOST_FIND_HEADER([boost/scoped_ptr.hpp])
1244 BOOST_FIND_HEADER([boost/shared_ptr.hpp])
1248 # BOOST_STATICASSERT()
1249 # --------------------
1250 # Look for Boost.StaticAssert
1251 BOOST_DEFUN([StaticAssert],
1252 [BOOST_FIND_HEADER([boost/static_assert.hpp])])
1255 # BOOST_STRING_ALGO()
1256 # -------------------
1257 # Look for Boost.StringAlgo
1258 BOOST_DEFUN([String_Algo],
1259 [BOOST_FIND_HEADER([boost/algorithm/string.hpp])
1263 # BOOST_SYSTEM([PREFERRED-RT-OPT])
1264 # --------------------------------
1265 # Look for Boost.System. For the documentation of PREFERRED-RT-OPT, see the
1266 # documentation of BOOST_FIND_LIB above. This library was introduced in Boost
1268 BOOST_DEFUN([System],
1269 [BOOST_FIND_LIB([system], [$1],
1270 [boost/system/error_code.hpp],
1271 [boost::system::error_code e; e.clear();])
1275 # BOOST_TEST([PREFERRED-RT-OPT])
1276 # ------------------------------
1277 # Look for Boost.Test. For the documentation of PREFERRED-RT-OPT, see the
1278 # documentation of BOOST_FIND_LIB above.
1280 [m4_pattern_allow([^BOOST_CHECK$])dnl
1281 BOOST_FIND_LIB([unit_test_framework], [$1],
1282 [boost/test/unit_test.hpp], [BOOST_CHECK(2 == 2);],
1283 [using boost::unit_test::test_suite;
1284 test_suite* init_unit_test_suite(int argc, char ** argv)
1289 # BOOST_THREAD([PREFERRED-RT-OPT])
1290 # ---------------------------------
1291 # Look for Boost.Thread. For the documentation of PREFERRED-RT-OPT, see the
1292 # documentation of BOOST_FIND_LIB above.
1293 BOOST_DEFUN([Thread],
1294 [dnl Having the pthread flag is required at least on GCC3 where
1295 dnl boost/thread.hpp would complain if we try to compile without
1296 dnl -pthread on GNU/Linux.
1297 AC_REQUIRE([_BOOST_PTHREAD_FLAG])dnl
1298 boost_thread_save_LIBS=$LIBS
1299 boost_thread_save_LDFLAGS=$LDFLAGS
1300 boost_thread_save_CPPFLAGS=$CPPFLAGS
1301 # Link-time dependency from thread to system was added as of 1.49.0.
1302 if test $boost_major_version -ge 149; then
1304 fi # end of the Boost.System check.
1305 m4_pattern_allow([^BOOST_SYSTEM_(LIBS|LDFLAGS)$])dnl
1306 LIBS="$LIBS $BOOST_SYSTEM_LIBS $boost_cv_pthread_flag"
1307 LDFLAGS="$LDFLAGS $BOOST_SYSTEM_LDFLAGS"
1308 CPPFLAGS="$CPPFLAGS $boost_cv_pthread_flag"
1310 # When compiling for the Windows platform, the threads library is named
1311 # differently. This suffix doesn't exist in new versions of Boost, or
1312 # possibly new versions of GCC on mingw I am assuming it's Boost's change for
1313 # now and I am setting version to 1.48, for lack of knowledge as to when this
1315 if test $boost_major_version -lt 148; then
1317 (*mingw*) boost_thread_lib_ext=_win32;;
1320 BOOST_FIND_LIBS([thread], [thread$boost_thread_lib_ext],
1322 [boost/thread.hpp], [boost::thread t; boost::mutex m;])
1325 (*mingw*) boost_thread_w32_socket_link=-lws2_32;;
1328 BOOST_THREAD_LIBS="$BOOST_THREAD_LIBS $BOOST_SYSTEM_LIBS $boost_cv_pthread_flag $boost_thread_w32_socket_link"
1329 BOOST_THREAD_LDFLAGS="$BOOST_SYSTEM_LDFLAGS"
1330 BOOST_CPPFLAGS="$BOOST_CPPFLAGS $boost_cv_pthread_flag"
1331 LIBS=$boost_thread_save_LIBS
1332 LDFLAGS=$boost_thread_save_LDFLAGS
1333 CPPFLAGS=$boost_thread_save_CPPFLAGS
1336 AU_ALIAS([BOOST_THREADS], [BOOST_THREAD])
1341 # Look for Boost.Tokenizer
1342 BOOST_DEFUN([Tokenizer],
1343 [BOOST_FIND_HEADER([boost/tokenizer.hpp])])
1348 # Look for Boost.Tribool
1349 BOOST_DEFUN([Tribool],
1350 [BOOST_FIND_HEADER([boost/logic/tribool_fwd.hpp])
1351 BOOST_FIND_HEADER([boost/logic/tribool.hpp])
1357 # Look for Boost.Tuple
1358 BOOST_DEFUN([Tuple],
1359 [BOOST_FIND_HEADER([boost/tuple/tuple.hpp])])
1362 # BOOST_TYPETRAITS()
1363 # --------------------
1364 # Look for Boost.TypeTraits
1365 BOOST_DEFUN([TypeTraits],
1366 [BOOST_FIND_HEADER([boost/type_traits.hpp])])
1371 # Look for Boost.Utility (noncopyable, result_of, base-from-member idiom,
1373 BOOST_DEFUN([Utility],
1374 [BOOST_FIND_HEADER([boost/utility.hpp])])
1379 # Look for Boost.Variant.
1380 BOOST_DEFUN([Variant],
1381 [BOOST_FIND_HEADER([boost/variant/variant_fwd.hpp])
1382 BOOST_FIND_HEADER([boost/variant.hpp])])
1385 # BOOST_POINTER_CONTAINER()
1386 # ------------------------
1387 # Look for Boost.PointerContainer
1388 BOOST_DEFUN([Pointer_Container],
1389 [BOOST_FIND_HEADER([boost/ptr_container/ptr_deque.hpp])
1390 BOOST_FIND_HEADER([boost/ptr_container/ptr_list.hpp])
1391 BOOST_FIND_HEADER([boost/ptr_container/ptr_vector.hpp])
1392 BOOST_FIND_HEADER([boost/ptr_container/ptr_array.hpp])
1393 BOOST_FIND_HEADER([boost/ptr_container/ptr_set.hpp])
1394 BOOST_FIND_HEADER([boost/ptr_container/ptr_map.hpp])
1395 ])# BOOST_POINTER_CONTAINER
1398 # BOOST_WAVE([PREFERRED-RT-OPT])
1399 # ------------------------------
1400 # NOTE: If you intend to use Wave/Spirit with thread support, make sure you
1401 # call BOOST_THREAD first.
1402 # Look for Boost.Wave. For the documentation of PREFERRED-RT-OPT, see the
1403 # documentation of BOOST_FIND_LIB above.
1405 [AC_REQUIRE([BOOST_FILESYSTEM])dnl
1406 AC_REQUIRE([BOOST_DATE_TIME])dnl
1407 boost_wave_save_LIBS=$LIBS
1408 boost_wave_save_LDFLAGS=$LDFLAGS
1409 m4_pattern_allow([^BOOST_((FILE)?SYSTEM|DATE_TIME|THREAD)_(LIBS|LDFLAGS)$])dnl
1410 LIBS="$LIBS $BOOST_SYSTEM_LIBS $BOOST_FILESYSTEM_LIBS $BOOST_DATE_TIME_LIBS \
1412 LDFLAGS="$LDFLAGS $BOOST_SYSTEM_LDFLAGS $BOOST_FILESYSTEM_LDFLAGS \
1413 $BOOST_DATE_TIME_LDFLAGS $BOOST_THREAD_LDFLAGS"
1414 BOOST_FIND_LIB([wave], [$1],
1416 [boost::wave::token_id id; get_token_name(id);])
1417 LIBS=$boost_wave_save_LIBS
1418 LDFLAGS=$boost_wave_save_LDFLAGS
1424 # Look for Boost.Xpressive (new since 1.36.0).
1425 BOOST_DEFUN([Xpressive],
1426 [BOOST_FIND_HEADER([boost/xpressive/xpressive.hpp])])
1429 # ----------------- #
1430 # Internal helpers. #
1431 # ----------------- #
1434 # _BOOST_PTHREAD_FLAG()
1435 # ---------------------
1436 # Internal helper for BOOST_THREAD. Computes boost_cv_pthread_flag
1437 # which must be used in CPPFLAGS and LIBS.
1439 # Yes, we *need* to put the -pthread thing in CPPFLAGS because with GCC3,
1440 # boost/thread.hpp will trigger a #error if -pthread isn't used:
1441 # boost/config/requires_threads.hpp:47:5: #error "Compiler threading support
1442 # is not turned on. Please set the correct command line options for
1443 # threading: -pthread (Linux), -pthreads (Solaris) or -mthreads (Mingw32)"
1445 # Based on ACX_PTHREAD: http://autoconf-archive.cryp.to/acx_pthread.html
1446 AC_DEFUN([_BOOST_PTHREAD_FLAG],
1447 [AC_REQUIRE([AC_PROG_CXX])dnl
1448 AC_REQUIRE([AC_CANONICAL_HOST])dnl
1449 AC_LANG_PUSH([C++])dnl
1450 AC_CACHE_CHECK([for the flags needed to use pthreads], [boost_cv_pthread_flag],
1451 [ boost_cv_pthread_flag=
1452 # The ordering *is* (sometimes) important. Some notes on the
1453 # individual items follow:
1454 # (none): in case threads are in libc; should be tried before -Kthread and
1455 # other compiler flags to prevent continual compiler warnings
1456 # -lpthreads: AIX (must check this before -lpthread)
1457 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
1458 # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
1459 # -llthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
1460 # -pthread: GNU Linux/GCC (kernel threads), BSD/GCC (userland threads)
1461 # -pthreads: Solaris/GCC
1462 # -mthreads: MinGW32/GCC, Lynx/GCC
1463 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
1464 # doesn't hurt to check since this sometimes defines pthreads too;
1465 # also defines -D_REENTRANT)
1466 # ... -mt is also the pthreads flag for HP/aCC
1467 # -lpthread: GNU Linux, etc.
1468 # --thread-safe: KAI C++
1471 # On Solaris (at least, for some versions), libc contains stubbed
1472 # (non-functional) versions of the pthreads routines, so link-based
1473 # tests will erroneously succeed. (We need to link with -pthreads/-mt/
1474 # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
1475 # a function called by this macro, so we could check for that, but
1476 # who knows whether they'll stub that too in a future libc.) So,
1477 # we'll just look for -pthreads and -lpthread first:
1478 boost_pthread_flags="-pthreads -lpthread -mt -pthread";; #(
1480 boost_pthread_flags="-lpthreads -Kthread -kthread -llthread -pthread \
1481 -pthreads -mthreads -lpthread --thread-safe -mt";;
1483 # Generate the test file.
1484 AC_LANG_CONFTEST([AC_LANG_PROGRAM([#include <pthread.h>],
1485 [pthread_t th; pthread_join(th, 0);
1486 pthread_attr_init(0); pthread_cleanup_push(0, 0);
1487 pthread_create(0,0,0,0); pthread_cleanup_pop(0);])])
1488 for boost_pthread_flag in '' $boost_pthread_flags; do
1489 boost_pthread_ok=false
1490 dnl Re-use the test file already generated.
1491 boost_pthreads__save_LIBS=$LIBS
1492 LIBS="$LIBS $boost_pthread_flag"
1494 [if grep ".*$boost_pthread_flag" conftest.err; then
1495 echo "This flag seems to have triggered warnings" >&AS_MESSAGE_LOG_FD
1497 boost_pthread_ok=:; boost_cv_pthread_flag=$boost_pthread_flag
1499 LIBS=$boost_pthreads__save_LIBS
1500 $boost_pthread_ok && break
1503 AC_LANG_POP([C++])dnl
1504 ])# _BOOST_PTHREAD_FLAG
1507 # _BOOST_gcc_test(MAJOR, MINOR)
1508 # -----------------------------
1509 # Internal helper for _BOOST_FIND_COMPILER_TAG.
1510 m4_define([_BOOST_gcc_test],
1511 ["defined __GNUC__ && __GNUC__ == $1 && __GNUC_MINOR__ == $2 && !defined __ICC @ gcc$1$2"])dnl
1513 # _BOOST_mingw_test(MAJOR, MINOR)
1514 # -----------------------------
1515 # Internal helper for _BOOST_FIND_COMPILER_TAG.
1516 m4_define([_BOOST_mingw_test],
1517 ["defined __GNUC__ && __GNUC__ == $1 && __GNUC_MINOR__ == $2 && !defined __ICC && \
1518 (defined WIN32 || defined WINNT || defined _WIN32 || defined __WIN32 \
1519 || defined __WIN32__ || defined __WINNT || defined __WINNT__) @ mgw$1$2"])dnl
1522 # _BOOST_FIND_COMPILER_TAG()
1523 # --------------------------
1524 # Internal. When Boost is installed without --layout=system, each library
1525 # filename will hold a suffix that encodes the compiler used during the
1526 # build. The Boost build system seems to call this a `tag'.
1527 AC_DEFUN([_BOOST_FIND_COMPILER_TAG],
1528 [AC_REQUIRE([AC_PROG_CXX])dnl
1529 AC_REQUIRE([AC_CANONICAL_HOST])dnl
1530 AC_CACHE_CHECK([for the toolset name used by Boost for $CXX],
1532 [boost_cv_lib_tag=unknown
1533 if test x$boost_cv_inc_path != xno; then
1534 AC_LANG_PUSH([C++])dnl
1535 # The following tests are mostly inspired by boost/config/auto_link.hpp
1536 # The list is sorted to most recent/common to oldest compiler (in order
1537 # to increase the likelihood of finding the right compiler with the
1538 # least number of compilation attempt).
1539 # Beware that some tests are sensible to the order (for instance, we must
1540 # look for MinGW before looking for GCC3).
1541 # I used one compilation test per compiler with a #error to recognize
1542 # each compiler so that it works even when cross-compiling (let me know
1543 # if you know a better approach).
1544 # Known missing tags (known from Boost's tools/build/v2/tools/common.jam):
1545 # como, edg, kcc, bck, mp, sw, tru, xlc
1546 # I'm not sure about my test for `il' (be careful: Intel's ICC pre-defines
1547 # the same defines as GCC's).
1549 _BOOST_mingw_test(8, 3) \
1550 _BOOST_gcc_test(8, 3) \
1551 _BOOST_mingw_test(8, 2) \
1552 _BOOST_gcc_test(8, 2) \
1553 _BOOST_mingw_test(8, 1) \
1554 _BOOST_gcc_test(8, 1) \
1555 _BOOST_mingw_test(8, 0) \
1556 _BOOST_gcc_test(8, 0) \
1557 _BOOST_mingw_test(7, 3) \
1558 _BOOST_gcc_test(7, 3) \
1559 _BOOST_mingw_test(7, 2) \
1560 _BOOST_gcc_test(7, 2) \
1561 _BOOST_mingw_test(7, 1) \
1562 _BOOST_gcc_test(7, 1) \
1563 _BOOST_mingw_test(7, 0) \
1564 _BOOST_gcc_test(7, 0) \
1565 _BOOST_mingw_test(6, 4) \
1566 _BOOST_gcc_test(6, 4) \
1567 _BOOST_mingw_test(6, 3) \
1568 _BOOST_gcc_test(6, 3) \
1569 _BOOST_mingw_test(6, 2) \
1570 _BOOST_gcc_test(6, 2) \
1571 _BOOST_mingw_test(6, 1) \
1572 _BOOST_gcc_test(6, 1) \
1573 _BOOST_mingw_test(6, 0) \
1574 _BOOST_gcc_test(6, 0) \
1575 _BOOST_mingw_test(5, 5) \
1576 _BOOST_gcc_test(5, 5) \
1577 _BOOST_mingw_test(5, 4) \
1578 _BOOST_gcc_test(5, 4) \
1579 _BOOST_mingw_test(5, 3) \
1580 _BOOST_gcc_test(5, 3) \
1581 _BOOST_mingw_test(5, 2) \
1582 _BOOST_gcc_test(5, 2) \
1583 _BOOST_mingw_test(5, 1) \
1584 _BOOST_gcc_test(5, 1) \
1585 _BOOST_mingw_test(5, 0) \
1586 _BOOST_gcc_test(5, 0) \
1587 _BOOST_mingw_test(4, 10) \
1588 _BOOST_gcc_test(4, 10) \
1589 _BOOST_mingw_test(4, 9) \
1590 _BOOST_gcc_test(4, 9) \
1591 _BOOST_mingw_test(4, 8) \
1592 _BOOST_gcc_test(4, 8) \
1593 _BOOST_mingw_test(4, 7) \
1594 _BOOST_gcc_test(4, 7) \
1595 _BOOST_mingw_test(4, 6) \
1596 _BOOST_gcc_test(4, 6) \
1597 _BOOST_mingw_test(4, 5) \
1598 _BOOST_gcc_test(4, 5) \
1599 _BOOST_mingw_test(4, 4) \
1600 _BOOST_gcc_test(4, 4) \
1601 _BOOST_mingw_test(4, 3) \
1602 _BOOST_gcc_test(4, 3) \
1603 _BOOST_mingw_test(4, 2) \
1604 _BOOST_gcc_test(4, 2) \
1605 _BOOST_mingw_test(4, 1) \
1606 _BOOST_gcc_test(4, 1) \
1607 _BOOST_mingw_test(4, 0) \
1608 _BOOST_gcc_test(4, 0) \
1609 "defined __GNUC__ && __GNUC__ == 3 && !defined __ICC \
1610 && (defined WIN32 || defined WINNT || defined _WIN32 || defined __WIN32 \
1611 || defined __WIN32__ || defined __WINNT || defined __WINNT__) @ mgw" \
1612 _BOOST_gcc_test(3, 4) \
1613 _BOOST_gcc_test(3, 3) \
1614 "defined _MSC_VER && _MSC_VER >= 1500 @ vc90" \
1615 "defined _MSC_VER && _MSC_VER == 1400 @ vc80" \
1616 _BOOST_gcc_test(3, 2) \
1617 "defined _MSC_VER && _MSC_VER == 1310 @ vc71" \
1618 _BOOST_gcc_test(3, 1) \
1619 _BOOST_gcc_test(3, 0) \
1620 "defined __BORLANDC__ @ bcb" \
1621 "defined __ICC && (defined __unix || defined __unix__) @ il" \
1622 "defined __ICL @ iw" \
1623 "defined _MSC_VER && _MSC_VER == 1300 @ vc7" \
1624 _BOOST_gcc_test(2, 95) \
1625 "defined __MWERKS__ && __MWERKS__ <= 0x32FF @ cw9" \
1626 "defined _MSC_VER && _MSC_VER < 1300 && !defined UNDER_CE @ vc6" \
1627 "defined _MSC_VER && _MSC_VER < 1300 && defined UNDER_CE @ evc4" \
1628 "defined __MWERKS__ && __MWERKS__ <= 0x31FF @ cw8"
1630 boost_tag_test=`expr "X$i" : 'X\([[^@]]*\) @ '`
1631 boost_tag=`expr "X$i" : 'X[[^@]]* @ \(.*\)'`
1632 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
1636 # error $boost_tag_test
1638 ]])], [boost_cv_lib_tag=$boost_tag; break], [])
1640 AC_LANG_POP([C++])dnl
1641 case $boost_cv_lib_tag in #(
1642 # Some newer (>= 1.35?) versions of Boost seem to only use "gcc" as opposed
1643 # to "gcc41" for instance.
1644 *-gcc | *'-gcc ') :;; #( Don't re-add -gcc: it's already in there.
1649 if test $boost_major_version -ge 136; then
1650 # The `x' added in r46793 of Boost.
1654 # We can specify multiple tags in this variable because it's used by
1655 # BOOST_FIND_LIB that does a `for tag in -$boost_cv_lib_tag' ...
1656 boost_cv_lib_tag="$boost_tag_x$boost_cv_lib_tag -${boost_tag_x}gcc"
1659 AC_MSG_WARN([[could not figure out which toolset name to use for $CXX]])
1663 fi])dnl end of AC_CACHE_CHECK
1664 ])# _BOOST_FIND_COMPILER_TAG
1667 # _BOOST_GUESS_WHETHER_TO_USE_MT()
1668 # --------------------------------
1669 # Compile a small test to try to guess whether we should favor MT (Multi
1670 # Thread) flavors of Boost. Sets boost_guess_use_mt accordingly.
1671 AC_DEFUN([_BOOST_GUESS_WHETHER_TO_USE_MT],
1672 [# Check whether we do better use `mt' even though we weren't ask to.
1673 AC_LANG_PUSH([C++])dnl
1674 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
1675 #if defined _REENTRANT || defined _MT || defined __MT__
1678 # error MT not needed
1680 ]])], [boost_guess_use_mt=:], [boost_guess_use_mt=false])
1681 AC_LANG_POP([C++])dnl
1684 # _BOOST_AC_LINK_IFELSE(PROGRAM, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
1685 # -------------------------------------------------------------------
1686 # Fork of _AC_LINK_IFELSE that preserves conftest.o across calls. Fragile,
1687 # will break when Autoconf changes its internals. Requires that you manually
1688 # rm -f conftest.$ac_objext in between to really different tests, otherwise
1689 # you will try to link a conftest.o left behind by a previous test.
1690 # Used to aggressively optimize BOOST_FIND_LIB (see the big comment in this
1693 # Don't use "break" in the actions, as it would short-circuit some code
1694 # this macro runs after the actions.
1695 m4_define([_BOOST_AC_LINK_IFELSE],
1696 [m4_ifvaln([$1], [AC_LANG_CONFTEST([$1])])dnl
1697 rm -f conftest$ac_exeext
1698 boost_save_ac_ext=$ac_ext
1700 # If we already have a .o, re-use it. We change $ac_ext so that $ac_link
1701 # tries to link the existing object file instead of compiling from source.
1702 test -f conftest.$ac_objext && ac_ext=$ac_objext && boost_use_source=false &&
1703 _AS_ECHO_LOG([re-using the existing conftest.$ac_objext])
1704 AS_IF([_AC_DO_STDERR($ac_link) && {
1705 test -z "$ac_[]_AC_LANG_ABBREV[]_werror_flag" ||
1706 test ! -s conftest.err
1707 } && test -s conftest$ac_exeext && {
1708 test "$cross_compiling" = yes ||
1709 $as_executable_p conftest$ac_exeext
1710 dnl FIXME: use AS_TEST_X instead when 2.61 is widespread enough.
1713 [if $boost_use_source; then
1714 _AC_MSG_LOG_CONFTEST
1717 ac_objext=$boost_save_ac_objext
1718 ac_ext=$boost_save_ac_ext
1719 dnl Delete also the IPA/IPO (Inter Procedural Analysis/Optimization)
1720 dnl information created by the PGI compiler (conftest_ipa8_conftest.oo),
1721 dnl as it would interfere with the next link command.
1722 rm -f core conftest.err conftest_ipa8_conftest.oo \
1723 conftest$ac_exeext m4_ifval([$1], [conftest.$ac_ext])[]dnl
1724 ])# _BOOST_AC_LINK_IFELSE