added hawkgo.go

bin/Makefile.am

@@ -37,3 +37,56 @@ hawk_LDFLAGS = $(LDFLAGS_COMMON)
 ## of different behavior depending on the libtool tag.
 ##
 hawk_LDADD = $(LIBADD_COMMON) $(LIBM)
+
+
+
+if ENABLE_HAWKGO
+
+## the attempt to compose a proper procedure using a regular compiler failed.
+## e.g ./configure GOC=opt/go/pkg/tool/linux_amd64/
+## while go.m4 is included in autoconf 2.71, the support for the go language
+## is very limited and the go language itself is pursuing the module based builder.
+##
+## the following is to trick autoconf/automake as if it's building go files with
+## a real compiler whereas the actual building is done thru `go build`
+
+bin_PROGRAMS += hawkgo
+hawkgo_SOURCES = \
+	../go.mod \
+	../hawk.go \
+	../hawk-inst.go \
+	hawkgo.go
+##hawkgo_DEPENDENCIES = 
+
+## let the linker to move hawkgo.bin to the actual target
+##hawkgo_LINK = mv -f hawkgo.bin hawkgo$(EXEEXT) || echo "FAILED TO LINK"
+hawkgo_LINK =
+
+if ENABLE_STATIC
+CGO_CFLAGS_ADD="-static"
+CGO_LDFLAGS_ADD="-static"
+else
+CGO_CFLAGS_ADD=""
+CGO_LDFLAGS_ADD=""
+endif
+
+hawkgo$(EXEEXT): ../lib/libhawk.la $(hawkgo_OBJECTS)
+	cp -pf $(top_srcdir)/go.mod $(builddir)/go.mod >/dev/null 2>&1 || true
+	chmod u+w $(builddir)/go.mod ## with `make distcheck`, the echo's redirection to the file fails without this permission change
+	[ -f $(srcdir)/go.sum ] && cp -pf $(srcdir)/go.sum $(builddir)/go.sum >/dev/null 2>&1 || true
+	## ---------------------------------------------------------------
+	CC=$(CC) \
+	CGO_CFLAGS="-I$(abs_top_srcdir)/lib -I$(abs_top_builddir)/lib $(CFLAGS) $(CGO_CFLAGS_EXTRA) $(CGO_CFLAGS_ADD)" \
+	CGO_LDFLAGS="-L$(abs_top_builddir)/lib -L$(abs_top_builddir)/lib/.libs -lhawk -ldl $(LIBM) $(CGO_LDFLAGS_EXTRA) $(CGO_LDFLAGS_ADD)"  \
+	go build -C $(srcdir) -ldflags "-X 'main.BINDIR=$(bindir)' -X 'main.SBINDIR=$(sbindir)' -X 'main.LIBDIR=$(libdir)' -X 'main.SYSCONFDIR=$(sysconfdir)'" -x -o $(abs_builddir)/$@ -modfile $(abs_builddir)/go.mod  $(abs_srcdir)/hawkgo.go
+	## ---------------------------------------------------------------
+	go clean -C $(srcdir) -x -modfile $(abs_builddir)/go.mod
+
+## the go to o recipe is fake to deceive make
+.go.o:
+	echo $< > $@
+
+.mod.o:
+	echo $< > $@
+
+endif