/usr/share/aclocal/ax_boost_asio.m4 is in autoconf-archive 20160916-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# http://www.gnu.org/software/autoconf-archive/ax_boost_asio.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_BOOST_ASIO
#
# DESCRIPTION
#
# Test for Asio library from the Boost C++ libraries. The macro requires a
# preceding call to AX_BOOST_BASE. Further documentation is available at
# <http://randspringer.de/boost/index.html>.
#
# This macro calls:
#
# AC_SUBST(BOOST_ASIO_LIB)
#
# And sets:
#
# HAVE_BOOST_ASIO
#
# LICENSE
#
# Copyright (c) 2008 Thomas Porschberg <thomas@randspringer.de>
# Copyright (c) 2008 Pete Greenwell <pete@mu.org>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 16
AC_DEFUN([AX_BOOST_ASIO],
[
AC_ARG_WITH([boost-asio],
AS_HELP_STRING([--with-boost-asio@<:@=special-lib@:>@],
[use the ASIO library from boost - it is possible to specify a certain library for the linker
e.g. --with-boost-asio=boost_system-gcc41-mt-1_34 ]),
[
if test "$withval" = "no"; then
want_boost="no"
elif test "$withval" = "yes"; then
want_boost="yes"
ax_boost_user_asio_lib=""
else
want_boost="yes"
ax_boost_user_asio_lib="$withval"
fi
],
[want_boost="yes"]
)
if test "x$want_boost" = "xyes"; then
AC_REQUIRE([AC_PROG_CC])
CPPFLAGS_SAVED="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
export CPPFLAGS
LDFLAGS_SAVED="$LDFLAGS"
LDFLAGS="$LDFLAGS $BOOST_LDFLAGS"
export LDFLAGS
AC_CACHE_CHECK(whether the Boost::ASIO library is available,
ax_cv_boost_asio,
[AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ @%:@include <boost/asio.hpp>
]],
[[
boost::asio::io_service io;
boost::system::error_code timer_result;
boost::asio::deadline_timer t(io);
t.cancel();
io.run_one();
return 0;
]])],
ax_cv_boost_asio=yes, ax_cv_boost_asio=no)
AC_LANG_POP([C++])
])
if test "x$ax_cv_boost_asio" = "xyes"; then
AC_DEFINE(HAVE_BOOST_ASIO,,[define if the Boost::ASIO library is available])
BN=boost_system
BOOSTLIBDIR=`echo $BOOST_LDFLAGS | sed -e 's/@<:@^\/@:>@*//'`
if test "x$ax_boost_user_asio_lib" = "x"; then
for ax_lib in `ls $BOOSTLIBDIR/libboost_system*.so* $BOOSTLIBDIR/libboost_system*.dylib* $BOOSTLIBDIR/libboost_system*.a* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^lib\(boost_system.*\)\.so.*$;\1;' -e 's;^lib\(boost_system.*\)\.dylib.*$;\1;' -e 's;^lib\(boost_system.*\)\.a.*$;\1;' ` ; do
AC_CHECK_LIB($ax_lib, main, [BOOST_ASIO_LIB="-l$ax_lib" AC_SUBST(BOOST_ASIO_LIB) link_thread="yes" break],
[link_thread="no"])
done
else
for ax_lib in $ax_boost_user_asio_lib $BN-$ax_boost_user_asio_lib; do
AC_CHECK_LIB($ax_lib, main,
[BOOST_ASIO_LIB="-l$ax_lib" AC_SUBST(BOOST_ASIO_LIB) link_asio="yes" break],
[link_asio="no"])
done
fi
if test "x$ax_lib" = "x"; then
AC_MSG_ERROR(Could not find a version of the library!)
fi
if test "x$link_asio" = "xno"; then
AC_MSG_ERROR(Could not link against $ax_lib !)
fi
fi
CPPFLAGS="$CPPFLAGS_SAVED"
LDFLAGS="$LDFLAGS_SAVED"
fi
])
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