# Copyright 2009 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.

all: package
package: _obj/$(TARG).a
testpackage: _test/$(TARG).a

# GNU Make 3.80 has a bug in lastword
# elem=$(lastword $(subst /, ,$(TARG)))
TARG_words=$(subst /, ,$(TARG))
elem=$(word $(words $(TARG_words)),$(TARG_words))

dir=$(patsubst %/$(elem),%,./$(TARG))
pkgdir=$(GOROOT)/pkg/$(GOOS)_$(GOARCH)

INSTALLFILES=$(pkgdir)/$(TARG).a

# The rest of the cgo rules are below, but these variable updates
# must be done here so they apply to the main rules.
GOFILES+=$(patsubst %.go,%.cgo1.go,$(CGOFILES))
GOFILES+=$(patsubst %.go,%.cgo2.go,$(CGOFILES))
OFILES+=$(patsubst %.go,%.cgo3.$O,$(CGOFILES))
INSTALLFILES+=$(patsubst %.go,$(pkgdir)/$(dir)/$(elem)_%.so,$(CGOFILES))
PREREQ+=$(patsubst %,%.make,$(DEPS))

coverage:
	gotest
	6cov -g $(shell pwd) $O.out | grep -v '_test\.go:'

clean:
	rm -rf *.[$(OS)o] *.a [$(OS)].out *.cgo[12].go *.cgo[34].c *.so _obj _test _testmain.go $(CLEANFILES)

test:
	gotest

nuke: clean
	rm -f $(pkgdir)/$(TARG).a

testpackage-clean:
	rm -f _test/$(TARG).a _gotest_.$O

install: $(INSTALLFILES)

$(pkgdir)/$(TARG).a: package
	@test -d $(GOROOT)/pkg && mkdir -p $(pkgdir)/$(dir)
	cp _obj/$(TARG).a $@

_go_.$O: $(GOFILES) $(PREREQ)
	$(GC) -o $@ $(GOFILES)

_gotest_.$O: $(GOFILES) $(GOTESTFILES) $(PREREQ)
	$(GC) -o $@ $(GOFILES) $(GOTESTFILES)

_obj/$(TARG).a: _go_.$O $(OFILES)
	@mkdir -p _obj/$(dir)
	rm -f _obj/$(TARG).a
	gopack grc $@ _go_.$O $(OFILES)

_test/$(TARG).a: _gotest_.$O $(OFILES)
	@mkdir -p _test/$(dir)
	rm -f _test/$(TARG).a
	gopack grc $@ _gotest_.$O $(OFILES)

importpath:
	@echo $(TARG)

dir:
	@echo $(dir)

%.make:
	(cd $* && gomake)

# To use cgo in a Go package, add a line
#
#	CGOFILES=x.go
#
# to the main Makefile.  This signals that cgo should process x.go.
# There are two optional variables to set, CGO_CFLAGS and CGO_LDFLAGS,
# which specify compiler and linker flags to use when compiling
# (using gcc) the C support for x.go.

# Cgo translates each x.go file listed in $(CGOFILES) into
#
#	x.cgo1.go - basic translation of x.go
#	x.cgo2.go - declarations needed for x.cgo1.go; imports "unsafe"
#	x.cgo3.c - C trampoline code to be compiled with 6c and linked into the package
#	x.cgo4.c - C implementations compiled with gcc to create dynamic library
#
%.cgo1.go %.cgo2.go %.cgo3.c %.cgo4.c: %.go
	cgo $(CGO_CFLAGS) $*.go

# The rules above added x.cgo1.go and x.cgo2.go to $(GOFILES),
# added x.cgo3.$O to $OFILES, and added the installed copy of
# package_x.so (built from x.cgo4.c) to $(INSTALLFILES).

# Compile x.cgo3.c with 6c; needs access to the runtime headers.
RUNTIME_CFLAGS_amd64=-D_64BIT
RUNTIME_CFLAGS=-I$(GOROOT)/src/pkg/runtime $(RUNTIME_CFLAGS_$(GOARCH))
%.cgo3.$O: %.cgo3.c
	$(CC) $(CFLAGS) $(RUNTIME_CFLAGS) $*.cgo3.c

# Have to run gcc with the right size argument on hybrid 32/64 machines.
_CGO_CFLAGS_386=-m32
_CGO_CFLAGS_amd64=-m64
_CGO_LDFLAGS_linux=-shared -lpthread -lm
_CGO_LDFLAGS_darwin=-dynamiclib -Wl,-undefined,dynamic_lookup


# Compile x.cgo4.c with gcc to make package_x.so.
%.cgo4.o: %.cgo4.c
	gcc $(_CGO_CFLAGS_$(GOARCH)) -fPIC -O2 -o $@ -c $(CGO_CFLAGS) $*.cgo4.c

$(elem)_%.so: %.cgo4.o
	gcc $(_CGO_CFLAGS_$(GOARCH)) -o $@ $*.cgo4.o $(CGO_LDFLAGS)  $(_CGO_LDFLAGS_$(GOOS))

$(pkgdir)/$(dir)/$(elem)_%.so: $(elem)_%.so
	@test -d $(GOROOT)/pkg && mkdir -p $(pkgdir)/$(dir)
	cp $(elem)_$*.so $@

# Generic build rules.
# These come last so that the rules above can override them
# for more specific file names.
%.$O: %.c
	$(CC) $(CFLAGS) $*.c

%.$O: %.s
	$(AS) $*.s

%.$O: $(HFILES)