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# Check to see how 'make' treats includes. -*- Autoconf -*-
# Copyright (C) 2001-2018 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
# AM_MAKE_INCLUDE()
# -----------------
# Check whether make has an 'include' directive that can support all
# the idioms we need for our automatic dependency tracking code.
AC_DEFUN([AM_MAKE_INCLUDE],
[AC_MSG_CHECKING([whether ${MAKE-make} supports the include directive])
cat > confinc.mk << 'END'
am__doit:
@echo this is the am__doit target >confinc.out
.PHONY: am__doit
END
am__include="#"
am__quote=
# BSD make does it like this.
echo '.include "confinc.mk" # ignored' > confmf.BSD
# Other make implementations (GNU, Solaris 10, AIX) do it like this.
echo 'include confinc.mk # ignored' > confmf.GNU
_am_result=no
for s in GNU BSD; do
AM_RUN_LOG([${MAKE-make} -f confmf.$s && cat confinc.out])
AS_CASE([$?:`cat confinc.out 2>/dev/null`],
['0:this is the am__doit target'],
[AS_CASE([$s],
[BSD], [am__include='.include' am__quote='"'],
[am__include='include' am__quote=''])])
if test "$am__include" != "#"; then
_am_result="yes ($s style)"
break
fi
done
rm -f confinc.* confmf.*
AC_MSG_RESULT([${_am_result}])
AC_SUBST([am__include])])
AC_SUBST([am__quote])])