1 # Check to see how 'make' treats includes. -*- Autoconf -*-
3 # Copyright (C) 2001, 2002, 2003, 2005 Free Software Foundation, Inc.
5 # This file is free software; the Free Software Foundation
6 # gives unlimited permission to copy and/or distribute it,
7 # with or without modifications, as long as this notice is preserved.
13 # Check to see how make treats includes.
14 AC_DEFUN([AM_MAKE_INCLUDE],
16 cat > confinc << 'END'
21 # If we don't find an include directive, just comment out the code.
22 AC_MSG_CHECKING([for style of include used by $am_make])
26 # First try GNU make style include.
27 echo "include confinc" > confmf
28 # We grep out `Entering directory' and `Leaving directory'
29 # messages which can occur if `w' ends up in MAKEFLAGS.
30 # In particular we don't look at `^make:' because GNU make might
31 # be invoked under some other name (usually "gmake"), in which
32 # case it prints its new name instead of `make'.
33 if test "`$am_make -s -f confmf 2> /dev/null | grep -v 'ing directory'`" = "done"; then
38 # Now try BSD make style include.
39 if test "$am__include" = "#"; then
40 echo '.include "confinc"' > confmf
41 if test "`$am_make -s -f confmf 2> /dev/null`" = "done"; then
47 AC_SUBST([am__include])
49 AC_MSG_RESULT([$_am_result])