/usr/share/aclocal/ax_boost_filesystem.m4 is in autoconf-archive 20170928-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# https://www.gnu.org/software/autoconf-archive/ax_boost_filesystem.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_BOOST_FILESYSTEM
#
# DESCRIPTION
#
# Test for Filesystem 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_FILESYSTEM_LIB)
#
# And sets:
#
# HAVE_BOOST_FILESYSTEM
#
# LICENSE
#
# Copyright (c) 2009 Thomas Porschberg <thomas@randspringer.de>
# Copyright (c) 2009 Michael Tindal
# Copyright (c) 2009 Roman Rybalko <libtorrent@romanr.info>
#
# 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 27
AC_DEFUN([AX_BOOST_FILESYSTEM],
[
AC_ARG_WITH([boost-filesystem],
AS_HELP_STRING([--with-boost-filesystem@<:@=special-lib@:>@],
[use the Filesystem library from boost - it is possible to specify a certain library for the linker
e.g. --with-boost-filesystem=boost_filesystem-gcc-mt ]),
[
if test "$withval" = "no"; then
want_boost="no"
elif test "$withval" = "yes"; then
want_boost="yes"
ax_boost_user_filesystem_lib=""
else
want_boost="yes"
ax_boost_user_filesystem_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 $BOOST_LDFLAGS"
export LDFLAGS
LIBS_SAVED=$LIBS
LIBS="$LIBS $BOOST_SYSTEM_LIB"
export LIBS
AC_CACHE_CHECK(whether the Boost::Filesystem library is available,
ax_cv_boost_filesystem,
[AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@include <boost/filesystem/path.hpp>]],
[[using namespace boost::filesystem;
path my_path( "foo/bar/data.txt" );
return 0;]])],
ax_cv_boost_filesystem=yes, ax_cv_boost_filesystem=no)
AC_LANG_POP([C++])
])
if test "x$ax_cv_boost_filesystem" = "xyes"; then
AC_DEFINE(HAVE_BOOST_FILESYSTEM,,[define if the Boost::Filesystem library is available])
BOOSTLIBDIR=`echo $BOOST_LDFLAGS | sed -e 's/@<:@^\/@:>@*//'`
if test "x$ax_boost_user_filesystem_lib" = "x"; then
for libextension in `ls -r $BOOSTLIBDIR/libboost_filesystem* 2>/dev/null | sed 's,.*/lib,,' | sed 's,\..*,,'` ; do
ax_lib=${libextension}
AC_CHECK_LIB($ax_lib, exit,
[BOOST_FILESYSTEM_LIB="-l$ax_lib"; AC_SUBST(BOOST_FILESYSTEM_LIB) link_filesystem="yes"; break],
[link_filesystem="no"])
done
if test "x$link_filesystem" != "xyes"; then
for libextension in `ls -r $BOOSTLIBDIR/boost_filesystem* 2>/dev/null | sed 's,.*/,,' | sed -e 's,\..*,,'` ; do
ax_lib=${libextension}
AC_CHECK_LIB($ax_lib, exit,
[BOOST_FILESYSTEM_LIB="-l$ax_lib"; AC_SUBST(BOOST_FILESYSTEM_LIB) link_filesystem="yes"; break],
[link_filesystem="no"])
done
fi
else
for ax_lib in $ax_boost_user_filesystem_lib boost_filesystem-$ax_boost_user_filesystem_lib; do
AC_CHECK_LIB($ax_lib, exit,
[BOOST_FILESYSTEM_LIB="-l$ax_lib"; AC_SUBST(BOOST_FILESYSTEM_LIB) link_filesystem="yes"; break],
[link_filesystem="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_filesystem" != "xyes"; then
AC_MSG_ERROR(Could not link against $ax_lib !)
fi
fi
CPPFLAGS="$CPPFLAGS_SAVED"
LDFLAGS="$LDFLAGS_SAVED"
LIBS="$LIBS_SAVED"
fi
])
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