# Check to see how 'make' treats includes. -*- Autoconf -*- # Copyright (C) 2001-2020 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])])