Update with job builder.

[awesomized/libmemcached] / m4 / ax_am_jobserver.m4

diff --git a/m4/ax_am_jobserver.m4 b/m4/ax_am_jobserver.m4
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+# ===========================================================================
+#      http://www.gnu.org/software/autoconf-archive/ax_am_jobserver.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_AM_JOBSERVER([default_value])
+#
+# DESCRIPTION
+#
+#   Enables the use of make's jobserver for the purpose of parallel building
+#   by passing the -j option to make.
+#
+#   The option --enable-jobserver is added to configure which can accept a
+#   yes, no, or an integer. The integer is the number of separate jobs to
+#   allow. If 'yes' is given, then the is assumed to be one more than the
+#   number of CPUs (determined through AX_COUNT_CPUS). If the value of no is
+#   given, then the jobserver is disabled. The default value is given by the
+#   first argument of the macro, or 'yes' if the argument is omitted.
+#
+#   This macro makes use of AX_AM_MACROS, so you must add the following line
+#
+#     @INC_AMINCLUDE@
+#
+#   to your Makefile.am files.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Michael Paul Bailey <jinxidoru@byu.net>
+#
+#   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 7
+
+AC_DEFUN([AX_AM_JOBSERVER], [
+    AC_REQUIRE([AX_COUNT_CPUS])
+    AC_REQUIRE([AX_AM_MACROS])
+    AC_ARG_ENABLE( jobserver,
+    [  --enable-jobserver@<:@=no/yes/@%:@@:>@ default=m4_ifval([$1],[$1],[yes])
+                        Enable up to @%:@ make jobs
+                        yes: enable one more than CPU count
+    ],, [enable_jobserver=m4_ifval([$1],[$1],[yes])])
+    if test "x$enable_jobserver" = "xyes"; then
+        enable_jobserver=$CPU_COUNT
+        ((enable_jobserver++))
+    fi
+    m4_pattern_allow(AM_MAKEFLAGS)
+    if test "x$enable_jobserver" != "xno"; then
+        AC_MSG_NOTICE([added jobserver support to make for $enable_jobserver jobs])
+        AX_ADD_AM_MACRO( AM_MAKEFLAGS += -j$enable_jobserver )
+    fi
+])