/usr/share/aclocal/ax_boost_context.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_context.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_BOOST_CONTEXT
#
# DESCRIPTION
#
# Test for Context 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_CONTEXT_LIB)
#
# And sets:
#
# HAVE_BOOST_CONTEXT
#
# LICENSE
#
# Copyright (c) 2008 Thomas Porschberg <thomas@randspringer.de>
# Copyright (c) 2008 Michael Tindal
# Copyright (c) 2013 Daniel Casimiro <dan.casimiro@gmail.com>
#
# 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 2
AC_DEFUN([AX_BOOST_CONTEXT],
[
AC_ARG_WITH([boost-context],
AS_HELP_STRING([--with-boost-context@<:@=special-lib@:>@],
[use the Context library from boost - it is possible to specify a certain library for the linker
e.g. --with-boost-context=boost_context-gcc-mt ]), [
if test "$withval" = "no"; then
want_boost="no"
elif test "$withval" = "yes"; then
want_boost="yes"
ax_boost_user_context_lib=""
else
want_boost="yes"
ax_boost_user_context_lib="$withval"
fi
], [want_boost="yes"]
)
if test "x$want_boost" = "xyes"; then
AC_REQUIRE([AC_PROG_CC])
AC_REQUIRE([AC_CANONICAL_BUILD])
CPPFLAGS_SAVED="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
export CPPFLAGS
LDFLAGS_SAVED="$LDFLAGS"
LDFLAGS="$LDFLAGS $BOOST_LDFLAGS"
export LDFLAGS
AC_CACHE_CHECK(whether the Boost::Context library is available,
ax_cv_boost_context,
[AC_LANG_PUSH([C++])
CXXFLAGS_SAVE=$CXXFLAGS
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[@%:@include <boost/context/all.hpp>]],
[[boost::context::fcontext_t* fc = boost::context::make_fcontext(0, 0, 0);]])],
ax_cv_boost_context=yes, ax_cv_boost_context=no)
CXXFLAGS=$CXXFLAGS_SAVE
AC_LANG_POP([C++])
])
if test "x$ax_cv_boost_context" = "xyes"; then
AC_SUBST(BOOST_CPPFLAGS)
AC_DEFINE(HAVE_BOOST_CONTEXT,,[define if the Boost::Context library is available])
BOOSTLIBDIR=`echo $BOOST_LDFLAGS | sed -e 's/@<:@^\/@:>@*//'`
if test "x$ax_boost_user_context_lib" = "x"; then
for libextension in `ls $BOOSTLIBDIR/libboost_context*.so* $BOOSTLIBDIR/libboost_context*.dylib* $BOOSTLIBDIR/libboost_context*.a* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^lib\(boost_context.*\)\.so.*$;\1;' -e 's;^lib\(boost_context.*\)\.dylib.*$;\1;' -e 's;^lib\(boost_context.*\)\.a.*$;\1;'` ; do
ax_lib=${libextension}
AC_CHECK_LIB($ax_lib, exit,
[BOOST_CONTEXT_LIB="-l$ax_lib"; AC_SUBST(BOOST_CONTEXT_LIB) link_context="yes"; break],
[link_context="no"])
done
if test "x$link_context" != "xyes"; then
for libextension in `ls $BOOSTLIBDIR/boost_context*.dll* $BOOSTLIBDIR/boost_context*.a* 2>/dev/null | sed 's,.*/,,' | sed -e 's;^\(boost_context.*\)\.dll.*$;\1;' -e 's;^\(boost_context.*\)\.a.*$;\1;'` ; do
ax_lib=${libextension}
AC_CHECK_LIB($ax_lib, exit,
[BOOST_CONTEXT_LIB="-l$ax_lib"; AC_SUBST(BOOST_CONTEXT_LIB) link_context="yes"; break],
[link_context="no"])
done
fi
else
for ax_lib in $ax_boost_user_context_lib boost_context-$ax_boost_user_context_lib; do
AC_CHECK_LIB($ax_lib, exit,
[BOOST_CONTEXT_LIB="-l$ax_lib"; AC_SUBST(BOOST_CONTEXT_LIB) link_context="yes"; break],
[link_context="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_context" = "xno"; then
AC_MSG_ERROR(Could not link against $ax_lib !)
fi
fi
CPPFLAGS="$CPPFLAGS_SAVED"
LDFLAGS="$LDFLAGS_SAVED"
fi
])
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