Initial Spring 2016 commit.

mk/os161.hostcompile.mk

@@ -0,0 +1,75 @@
+#
+# 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-local: cleanhostcompile
+cleanhostcompile:
+	rm -f $(MYBUILDDIR)/*.ho $(MYBUILDDIR)/*.ha
+
+distclean-local: distcleanhostcompile
+distcleanhostcompile:
+	rm -f $(MYBUILDDIR)/.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 fixdepends script transforms the results by substituting some
+# make variables back into them; this way the depend files are
+# independent of (at least some of) the build configuration. It also
+# changes .o files to .ho files so the host and native builds are
+# independent, and allows for placing the .ho files in the build
+# directory.
+#
+depend-local: $(MYBUILDDIR) .WAIT predepend .WAIT dependhostcompile
+dependhostcompile:
+	$(HOST_CC) $(HOST_CFLAGS) -DHOST -MM $(SRCS) |\
+		$(TOP)/mk/fixdepends.sh '$(INSTALLTOP)' host \
+		> $(MYBUILDDIR)/.hostdeptmp
+	mv -f $(MYBUILDDIR)/.hostdeptmp $(MYBUILDDIR)/.hostdepend
+
+.-include "$(MYBUILDDIR)/.hostdepend"
+
+predepend:
+.PHONY: predepend
+
+# 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-local cleanhostcompile distclean-local distcleanhostcompile
+.PHONY: depend-local dependhostcompile tags tagshostcompile
+
+# End.