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+dnl dolt, a replacement for libtool
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+dnl Copyright © 2007-2010 Josh Triplett <josh@joshtriplett.org>
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+dnl Copying and distribution of this file, with or without modification,
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+dnl are permitted in any medium without royalty provided the copyright
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+dnl notice and this notice are preserved.
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+dnl
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+dnl To use dolt, invoke the DOLT macro immediately after the libtool macros.
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+dnl Optionally, copy this file into acinclude.m4, to avoid the need to have it
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+dnl installed when running autoconf on your project.
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+
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+AC_DEFUN([DOLT], [
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+AC_REQUIRE([AC_CANONICAL_HOST])
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+# dolt, a replacement for libtool
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+# Josh Triplett <josh@freedesktop.org>
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+AC_PATH_PROG([DOLT_BASH], [bash])
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+AC_MSG_CHECKING([if dolt supports this host])
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+dolt_supported=yes
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+AS_IF([test x$DOLT_BASH = x], [dolt_supported=no])
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+AS_IF([test x$GCC != xyes], [dolt_supported=no])
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+
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+AS_CASE([$host],
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+ [*-*-linux*|*-*-freebsd*], [pic_options='-fPIC'],
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+ [*-apple-darwin*], [pic_options='-fno-common'],
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+ [*mingw*|*nacl*], [pic_options='']
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+ [*], [dolt_supported=no]
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+)
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+AS_IF([test x$dolt_supported = xno], [
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+ AC_MSG_RESULT([no, falling back to libtool])
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+ LTCOMPILE='$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(COMPILE)'
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+ LTCXXCOMPILE='$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXXCOMPILE)'
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+ m4_pattern_allow([AM_V_lt])
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+], [
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+ AC_MSG_RESULT([yes, replacing libtool])
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+
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+dnl Start writing out doltcompile.
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+ cat <<__DOLTCOMPILE__EOF__ >doltcompile
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+#!$DOLT_BASH
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+__DOLTCOMPILE__EOF__
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+ cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
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+args=("$[]@")
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+for ((arg=0; arg<${#args@<:@@@:>@}; arg++)) ; do
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+ if test x"${args@<:@$arg@:>@}" = x-o ; then
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+ objarg=$((arg+1))
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+ break
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+ fi
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+done
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+if test x$objarg = x ; then
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+ echo 'Error: no -o on compiler command line' 1>&2
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+ exit 1
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+fi
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+lo="${args@<:@$objarg@:>@}"
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+obj="${lo%.lo}"
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+if test x"$lo" = x"$obj" ; then
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+ echo "Error: libtool object file name \"$lo\" does not end in .lo" 1>&2
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+ exit 1
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+fi
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+objbase="${obj##*/}"
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+__DOLTCOMPILE__EOF__
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+
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+dnl Write out shared compilation code.
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+ if test x$enable_shared = xyes; then
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+ cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
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+libobjdir="${obj%$objbase}.libs"
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+if test ! -d "$libobjdir" ; then
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+ mkdir_out="$(mkdir "$libobjdir" 2>&1)"
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+ mkdir_ret=$?
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+ if test "$mkdir_ret" -ne 0 && test ! -d "$libobjdir" ; then
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+ echo "$mkdir_out" 1>&2
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+ exit $mkdir_ret
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+ fi
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+fi
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+pic_object="$libobjdir/$objbase.o"
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+args@<:@$objarg@:>@="$pic_object"
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+__DOLTCOMPILE__EOF__
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+ cat <<__DOLTCOMPILE__EOF__ >>doltcompile
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+"\${args@<:@@@:>@}" $pic_options -DPIC || exit \$?
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+__DOLTCOMPILE__EOF__
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+ fi
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+
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+dnl Write out static compilation code.
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+dnl Avoid duplicate compiler output if also building shared objects.
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+ if test x$enable_static = xyes; then
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+ cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
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+non_pic_object="$obj.o"
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+args@<:@$objarg@:>@="$non_pic_object"
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+__DOLTCOMPILE__EOF__
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+ if test x$enable_shared = xyes; then
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+ cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
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+"${args@<:@@@:>@}" >/dev/null 2>&1 || exit $?
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+__DOLTCOMPILE__EOF__
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+ else
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+ cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
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+"${args@<:@@@:>@}" || exit $?
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+__DOLTCOMPILE__EOF__
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+ fi
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+ fi
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+
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+dnl Write out the code to write the .lo file.
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+dnl The second line of the .lo file must match "^# Generated by .*libtool"
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+ cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
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+{
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+echo "# $lo - a libtool object file"
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+echo "# Generated by doltcompile, not libtool"
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+__DOLTCOMPILE__EOF__
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+
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+ if test x$enable_shared = xyes; then
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+ cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
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+echo "pic_object='.libs/${objbase}.o'"
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+__DOLTCOMPILE__EOF__
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+ else
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+ cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
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+echo pic_object=none
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+__DOLTCOMPILE__EOF__
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+ fi
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+
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+ if test x$enable_static = xyes; then
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+ cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
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+echo "non_pic_object='${objbase}.o'"
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+__DOLTCOMPILE__EOF__
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+ else
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+ cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
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+echo non_pic_object=none
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+__DOLTCOMPILE__EOF__
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+ fi
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+
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+ cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
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+} > "$lo"
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+__DOLTCOMPILE__EOF__
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+
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+dnl Done writing out doltcompile; substitute it for libtool compilation.
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+ chmod +x doltcompile
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+ LTCOMPILE='$(top_builddir)/doltcompile $(COMPILE)'
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+ LTCXXCOMPILE='$(top_builddir)/doltcompile $(CXXCOMPILE)'
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+
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+dnl automake ignores LTCOMPILE and LTCXXCOMPILE when it has separate CFLAGS for
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+dnl a target, so write out a libtool wrapper to handle that case.
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+dnl Note that doltlibtool does not handle inferred tags or option arguments
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+dnl without '=', because automake does not use them.
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+ cat <<__DOLTLIBTOOL__EOF__ > doltlibtool
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+#!$DOLT_BASH
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+__DOLTLIBTOOL__EOF__
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+ cat <<'__DOLTLIBTOOL__EOF__' >>doltlibtool
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+top_builddir_slash="${0%%doltlibtool}"
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+: ${top_builddir_slash:=./}
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+args=()
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+modeok=false
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+tagok=false
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+for arg in "$[]@"; do
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+ case "$arg" in
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+ --mode=compile) modeok=true ;;
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+ --tag=CC|--tag=CXX) tagok=true ;;
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+ --silent|--quiet) ;;
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+ *) args@<:@${#args[@]}@:>@="$arg" ;;
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+ esac
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+done
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+if $modeok && $tagok ; then
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+ . ${top_builddir_slash}doltcompile "${args@<:@@@:>@}"
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+else
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+ exec ${top_builddir_slash}libtool "$[]@"
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+fi
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+__DOLTLIBTOOL__EOF__
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+
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+dnl Done writing out doltlibtool; substitute it for libtool.
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+ chmod +x doltlibtool
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+ LIBTOOL='$(top_builddir)/doltlibtool'
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+
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+DOLT_CLEANFILES="doltlibtool doltcompile"
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+AC_SUBST(DOLT_CLEANFILES)
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+])
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+AC_SUBST(LTCOMPILE)
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+AC_SUBST(LTCXXCOMPILE)
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+# end dolt
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+])
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Luca Barbato