build: Stop using dolt

This does regress "make -12" from 0.7s to 0.9s on my
Coffee Lake machine, but even on slower hardware this
will not amount to a noticable slowdown.

On the other hand using dolt can create problems for
people doing cross-compilation, e.g. Yocto has two
hacks just for dolt in kmod:
https://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/recipes-kernel/kmod/kmod.inc?id=a17abae00785c76cfffe5381a22fb2c86b982e82

(Lucas: remove leftover entry in Makefile and reformat commit message)

.gitignore

@@ -18,8 +18,6 @@
 /configure
 /coverage
 /cov-int
-/doltcompile
-/doltlibtool
 /libtool
 /stamp-h1
 /test-suite.log

Makefile.am

@@ -415,8 +415,6 @@ distclean-local: $(DISTCLEAN_LOCAL_HOOKS)
 buildtest-TESTS:
 	$(MAKE) $(AM_MAKEFLAGS) $(check_LTLIBRARIES) $(check_PROGRAMS)
 
-DISTCLEANFILES += $(DOLT_CLEANFILES)
-
 # ------------------------------------------------------------------------------
 # coverage
 # ------------------------------------------------------------------------------

configure.ac

@@ -17,7 +17,6 @@ AM_MAINTAINER_MODE([enable])
 AM_INIT_AUTOMAKE([check-news foreign 1.11 silent-rules tar-pax no-dist-gzip dist-xz subdir-objects color-tests parallel-tests])
 AM_SILENT_RULES([yes])
 LT_INIT([disable-static pic-only])
-DOLT
 
 AS_IF([test "x$enable_static" = "xyes"], [AC_MSG_ERROR([--enable-static is not supported by kmod])])
 AS_IF([test "x$enable_largefile" = "xno"], [AC_MSG_ERROR([--disable-largefile is not supported by kmod])])

m4/dolt.m4

@@ -1,181 +0,0 @@
-dnl dolt, a replacement for libtool
-dnl Copyright © 2007-2010 Josh Triplett <josh@joshtriplett.org>
-dnl Copying and distribution of this file, with or without modification,
-dnl are permitted in any medium without royalty provided the copyright
-dnl notice and this notice are preserved.
-dnl
-dnl To use dolt, invoke the DOLT macro immediately after the libtool macros.
-dnl Optionally, copy this file into acinclude.m4, to avoid the need to have it
-dnl installed when running autoconf on your project.
-
-AC_DEFUN([DOLT], [
-AC_REQUIRE([AC_CANONICAL_HOST])
-# dolt, a replacement for libtool
-# Josh Triplett <josh@freedesktop.org>
-AC_PATH_PROG([DOLT_BASH], [bash])
-AC_MSG_CHECKING([if dolt supports this host])
-dolt_supported=yes
-AS_IF([test x$DOLT_BASH = x], [dolt_supported=no])
-AS_IF([test x$GCC != xyes], [dolt_supported=no])
-
-AS_CASE([$host],
-    [*-*-linux*|*-*-freebsd*], [pic_options='-fPIC'],
-    [*-apple-darwin*],         [pic_options='-fno-common'],
-    [*mingw*|*nacl*],          [pic_options='']
-    [*],                       [dolt_supported=no]
-)
-AS_IF([test x$dolt_supported = xno], [
-    AC_MSG_RESULT([no, falling back to libtool])
-    LTCOMPILE='$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(COMPILE)'
-    LTCXXCOMPILE='$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXXCOMPILE)'
-    m4_pattern_allow([AM_V_lt])
-], [
-    AC_MSG_RESULT([yes, replacing libtool])
-
-dnl Start writing out doltcompile.
-    cat <<__DOLTCOMPILE__EOF__ >doltcompile
-#!$DOLT_BASH
-__DOLTCOMPILE__EOF__
-    cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
-args=("$[]@")
-for ((arg=0; arg<${#args@<:@@@:>@}; arg++)) ; do
-    if test x"${args@<:@$arg@:>@}" = x-o ; then
-        objarg=$((arg+1))
-        break
-    fi
-done
-if test x$objarg = x ; then
-    echo 'Error: no -o on compiler command line' 1>&2
-    exit 1
-fi
-lo="${args@<:@$objarg@:>@}"
-obj="${lo%.lo}"
-if test x"$lo" = x"$obj" ; then
-    echo "Error: libtool object file name \"$lo\" does not end in .lo" 1>&2
-    exit 1
-fi
-objbase="${obj##*/}"
-__DOLTCOMPILE__EOF__
-
-dnl Write out shared compilation code.
-    if test x$enable_shared = xyes; then
-        cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
-libobjdir="${obj%$objbase}.libs"
-if test ! -d "$libobjdir" ; then
-    mkdir_out="$(mkdir "$libobjdir" 2>&1)"
-    mkdir_ret=$?
-    if test "$mkdir_ret" -ne 0 && test ! -d "$libobjdir" ; then
-	echo "$mkdir_out" 1>&2
-        exit $mkdir_ret
-    fi
-fi
-pic_object="$libobjdir/$objbase.o"
-args@<:@$objarg@:>@="$pic_object"
-__DOLTCOMPILE__EOF__
-    cat <<__DOLTCOMPILE__EOF__ >>doltcompile
-    pic_options="$pic_options"
-    if test x\$passthrough = xtrue; then
-        pic_options=""
-    fi
-__DOLTCOMPILE__EOF__
-    cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
-"${args@<:@@@:>@}" $pic_options -DPIC || exit $?
-__DOLTCOMPILE__EOF__
-    fi
-
-dnl Write out static compilation code.
-dnl Avoid duplicate compiler output if also building shared objects.
-    if test x$enable_static = xyes; then
-        cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
-non_pic_object="$obj.o"
-args@<:@$objarg@:>@="$non_pic_object"
-__DOLTCOMPILE__EOF__
-        if test x$enable_shared = xyes; then
-            cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
-"${args@<:@@@:>@}" >/dev/null 2>&1 || exit $?
-__DOLTCOMPILE__EOF__
-        else
-            cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
-"${args@<:@@@:>@}" || exit $?
-__DOLTCOMPILE__EOF__
-        fi
-    fi
-
-dnl Write out the code to write the .lo file.
-dnl The second line of the .lo file must match "^# Generated by .*libtool"
-    cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
-{
-echo "# $lo - a libtool object file"
-echo "# Generated by doltcompile, not libtool"
-__DOLTCOMPILE__EOF__
-
-    if test x$enable_shared = xyes; then
-        cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
-echo "pic_object='.libs/${objbase}.o'"
-__DOLTCOMPILE__EOF__
-    else
-        cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
-echo pic_object=none
-__DOLTCOMPILE__EOF__
-    fi
-
-    if test x$enable_static = xyes; then
-        cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
-echo "non_pic_object='${objbase}.o'"
-__DOLTCOMPILE__EOF__
-    else
-        cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
-echo non_pic_object=none
-__DOLTCOMPILE__EOF__
-    fi
-
-    cat <<'__DOLTCOMPILE__EOF__' >>doltcompile
-} > "$lo"
-__DOLTCOMPILE__EOF__
-
-dnl Done writing out doltcompile; substitute it for libtool compilation.
-    chmod +x doltcompile
-    LTCOMPILE='$(top_builddir)/doltcompile $(COMPILE)'
-    LTCXXCOMPILE='$(top_builddir)/doltcompile $(CXXCOMPILE)'
-
-dnl automake ignores LTCOMPILE and LTCXXCOMPILE when it has separate CFLAGS for
-dnl a target, so write out a libtool wrapper to handle that case.
-dnl Note that doltlibtool does not handle inferred tags or option arguments
-dnl without '=', because automake does not use them.
-    cat <<__DOLTLIBTOOL__EOF__ > doltlibtool
-#!$DOLT_BASH
-__DOLTLIBTOOL__EOF__
-    cat <<'__DOLTLIBTOOL__EOF__' >>doltlibtool
-top_builddir_slash="${0%%doltlibtool}"
-: ${top_builddir_slash:=./}
-args=()
-modeok=false
-tagok=false
-for arg in "$[]@"; do
-    case "$arg" in
-        --mode=compile) modeok=true ;;
-        --tag=CC|--tag=CXX) tagok=true ;;
-        --tag=disable-static) tagok=true ;;
-        --tag=ASM|--tag=YASM) tagok=true; passthrough=true;;
-        --silent|--quiet) ;;
-        *) args@<:@${#args[@]}@:>@="$arg" ;;
-    esac
-done
-if $modeok && $tagok ; then
-    . ${top_builddir_slash}doltcompile "${args@<:@@@:>@}"
-else
-    exec ${top_builddir_slash}libtool "$[]@"
-fi
-__DOLTLIBTOOL__EOF__
-
-dnl Done writing out doltlibtool; substitute it for libtool.
-    chmod +x doltlibtool
-    LIBTOOL='$(top_builddir)/doltlibtool'
-
-DOLT_CLEANFILES="doltlibtool doltcompile"
-AC_SUBST(DOLT_CLEANFILES)
-])
-AC_SUBST(LTCOMPILE)
-AC_SUBST(LTCXXCOMPILE)
-# end dolt
-])