[systemd-devel] [PATCH] use dolt.m4 to speedup compilation
harald at redhat.com
harald at redhat.com
Thu Mar 5 02:58:30 PST 2015
From: Harald Hoyer <harald at redhat.com>
The speedup is significant
Original libtool
$ ccache -C && make clean && time make -j4
[…]
real 6m4.104s
user 13m49.234s
sys 7m37.864s
Original libtool + dolt
$ ccache -C && make clean && time make -j4
[…]
real 2m24.869s
user 7m30.198s
sys 1m17.813s
---
configure.ac | 1 +
m4/dolt.m4 | 178 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 179 insertions(+)
create mode 100644 m4/dolt.m4
diff --git a/configure.ac b/configure.ac
index 14518bc..bc75c31 100644
--- a/configure.ac
+++ b/configure.ac
@@ -40,6 +40,7 @@ AC_CANONICAL_HOST
AC_DEFINE_UNQUOTED([CANONICAL_HOST], "$host", [Canonical host string.])
LT_PREREQ(2.2)
LT_INIT([disable-static])
+DOLT
AS_IF([test "x$enable_static" = "xyes"], [AC_MSG_ERROR([--enable-static is not supported by systemd])])
AS_IF([test "x$enable_largefile" = "xno"], [AC_MSG_ERROR([--disable-largefile is not supported by systemd])])
diff --git a/m4/dolt.m4 b/m4/dolt.m4
new file mode 100644
index 0000000..af76e9d
--- /dev/null
+++ b/m4/dolt.m4
@@ -0,0 +1,178 @@
+dnl dolt, a replacement for libtool
+dnl Copyright © 2007-2010 Josh Triplett <josh at joshtriplett.org>
+dnl Copying and distribution of this file, with or without modification,
+dnl are permitted in any medium without royalty provided the copyright
+dnl notice and this notice are preserved.
+dnl
+dnl To use dolt, invoke the DOLT macro immediately after the libtool macros.
+dnl Optionally, copy this file into acinclude.m4, to avoid the need to have it
+dnl installed when running autoconf on your project.
+
+AC_DEFUN([DOLT], [
+AC_REQUIRE([AC_CANONICAL_HOST])
+# dolt, a replacement for libtool
+# Josh Triplett <josh at freedesktop.org>
+AC_PATH_PROG(DOLT_BASH, bash)
+AC_MSG_CHECKING([if dolt supports this host])
+dolt_supported=yes
+if test x$DOLT_BASH = x; then
+ dolt_supported=no
+fi
+if test x$GCC != xyes; then
+ dolt_supported=no
+fi
+case $host in
+*-*-linux* \
+|amd64-*-freebsd*|i?86-*-freebsd*|ia64-*-freebsd*)
+ pic_options='-fPIC'
+ ;;
+i?86-apple-darwin*)
+ pic_options='-fno-common'
+ ;;
+*)
+ dolt_supported=no
+ ;;
+esac
+if test x$dolt_supported = xno ; then
+ AC_MSG_RESULT([no, falling back to libtool])
+ LTCOMPILE='$(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(COMPILE)'
+ LTCXXCOMPILE='$(LIBTOOL) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXXCOMPILE)'
+else
+ AC_MSG_RESULT([yes, replacing libtool])
+
+dnl Start writing out doltcompile.
+ cat <<__DOLTCOMPILE__EOF__ >doltcompile
+#!$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
+"\${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 "$arg" in
+ --silent) : ;;
+ --mode=compile) modeok=true ;;
+ --tag=CC|--tag=CXX) tagok=true ;;
+ *) args@<:@${#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'
+fi
+AC_SUBST(LTCOMPILE)
+AC_SUBST(LTCXXCOMPILE)
+# end dolt
+])
--
2.3.1
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