#
# OS/161 build environment: compile source files for the host system.
#
# Usage: use os161.hostprog.mk or os161.hostlib.mk
#
# Variables controlling this file:
#
# SRCS .c and .S files to compile.
#
# Provides:
#
# HOST_OBJS .ho files from compilation.
#
# Objects list starts empty. It is added to below.
HOST_OBJS=
# .ho is a host object.
.SUFFIXES: .ho
clean: cleanhostcompile
cleanhostcompile:
rm -f $(MYBUILDDIR)/*.ho $(MYBUILDDIR)/*.ha
distclean: distcleanhostcompile
distcleanhostcompile:
rm -f .hostdepend
#
# Depend: generate dependency information.
# Use gcc's -MM argument for this.
#
# Note that we use -MM rather than -M, so we don't get system headers.
# They would be host system headers and we don't want to get involved
# with those.
#
# The awk scripts and the first sed invocation transform the results to
# have one file per line.
#
# The second sed command changes the .o filenames in gcc's output
# to .ho names.
#
# The third sed command replaces the value of $(INSTALLTOP) -- which
# is some pathname -- with the string $(INSTALLTOP). This makes the
# depend file independent of the value of $(INSTALLTOP).
#
# XXX: why the $p;$x? That seems like a no-op in this script... also,
# this logic is extremely opaque and could be done a lot better...
#
depend: dependhostcompile
dependhostcompile:
$(HOST_CC) $(HOST_CFLAGS) -DHOST -MM $(SRCS) |\
awk '{x=$$0~"^ ";for(i=1;i<=NF;i++){printf "%d %s\n",x,$$i;x=1; }}'|\
sed '/1 \\/d' | awk '{ printf "%s%s", $$1?" \\\n ":"\n", $$2 }' |\
sed 's/\.o/\.ho/' |\
sed 's|$(INSTALLTOP)|$$(INSTALLTOP)|;$$p;$$x' |\
sed 's|^\([^ ]\)|$$(MYBUILDDIR)/\1|' > .deptmp
mv -f .deptmp .depend
# We do need to explicitly include .hostdepend, unlike .depend.
.-include ".hostdepend"
# No tags for host programs.
tags: tagshostcompile
tagshostcompile: ;
#
# Compile rules.
# We can use the same rules for .c and .S because gcc knows how to handle
# .S files.
#
.for _S_ in $(SRCS:M*.[cS])
HOST_OBJS+=$(MYBUILDDIR)/$(_S_:T:R).ho
$(MYBUILDDIR)/$(_S_:T:R).ho: $(_S_)
$(HOST_CC) $(HOST_CFLAGS) -DHOST -c $(_S_) -o $(.TARGET)
.endfor
# Make non-file rules PHONY.
.PHONY: clean cleanhostcompile distclean distcleanhostcompile
.PHONY: depend dependhostcompile tags tagshostcompile
# End.
