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# Subdirectories include this makefile to forward rules to the top level makefile.
# Define ${top} for where the top level is.
# Example: src/GNUmakefile:
# top = ..
# include ${top}/GNUmakefile.subdir
.SUFFIXES:
pwd = ${shell pwd}
abs_top = ${abspath ${top}}/
abs_pwd = ${abspath ${pwd}}
cdir = ${subst ${abs_top},,${abs_pwd}}
# ------------------------------------------------------------------------------
ifneq (${MAKECMDGOALS},)
# If arguments are given, presumably files like test.o, forward them to top
# with cdir prefix.
# All files are forwarded as one rule, based on first; rest are quietly ignored.
goals := ${filter-out echo ${DONT_FORWARD}, ${MAKECMDGOALS}}
forward := ${addprefix ${cdir}/, ${goals}}
first := ${firstword ${goals}}
rest := ${wordlist 2, ${words ${goals}}, ${goals}}
${first}: force
cd ${top} && ${MAKE} ${forward}
${rest}: force
@echo > /dev/null
# ------------------------------------------------------------------------------
else
# Otherwise, forward subdirectory name as target.
.PHONY: ${cdir}
${cdir}:
cd ${top} && ${MAKE} $@
endif
# ------------------------------------------------------------------------------
force: ;
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