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# SPDX-License-Identifier: Apache-2.0
#
# Copyright © 2017-2021 WireGuard LLC. All Rights Reserved.
BUILDDIR ?= $(CURDIR)/build
DESTDIR ?= $(CURDIR)/out
NDK_GO_ARCH_MAP_x86 := 386
NDK_GO_ARCH_MAP_x86_64 := amd64
NDK_GO_ARCH_MAP_arm := arm
NDK_GO_ARCH_MAP_arm64 := arm64
NDK_GO_ARCH_MAP_mips := mipsx
NDK_GO_ARCH_MAP_mips64 := mips64x
CLANG_FLAGS := --target=$(ANDROID_LLVM_TRIPLE) --gcc-toolchain=$(ANDROID_TOOLCHAIN_ROOT) --sysroot=$(ANDROID_SYSROOT)
export CGO_CFLAGS := $(CLANG_FLAGS) $(CFLAGS)
export CGO_LDFLAGS := $(CLANG_FLAGS) $(LDFLAGS) -Wl,-soname=libwg-go.so
export CC := $(ANDROID_C_COMPILER)
export GOARCH := $(NDK_GO_ARCH_MAP_$(ANDROID_ARCH_NAME))
export GOOS := android
export CGO_ENABLED := 1
export GOPATH ?= $(HOME)/go
GO_VERSION := 1.17.2
GO_PLATFORM := $(shell uname -s | tr '[:upper:]' '[:lower:]')-$(NDK_GO_ARCH_MAP_$(shell uname -m))
GO_TARBALL := go$(GO_VERSION).$(GO_PLATFORM).tar.gz
GO_HASH_darwin-amd64 := 7914497a302a132a465d33f5ee044ce05568bacdb390ab805cb75a3435a23f94
GO_HASH_darwin-arm64 := ce8771bd3edfb5b28104084b56bbb532eeb47fbb7769c3e664c6223712c30904
GO_HASH_linux-amd64 := f242a9db6a0ad1846de7b6d94d507915d14062660616a61ef7c808a76e4f1676
PROTOC_GEN_GO := $(GOPATH)/bin/protoc-gen-go
# FIXME autodetect protoc path
PROTOC := /root/.gradle/caches/modules-2/files-2.1/com.google.protobuf/protoc/3.19.1/d231c807be82ffc29b02525c8c2691772eb945bc/protoc-3.19.1-linux-x86_64.exe
PROTODIR = $(CURDIR)/../../src/main/proto
PROTO_INCLUDEDIR = $(CURDIR)/../../build/extracted-include-protos/debug
PBDIR = $(GOPATH)/pkg/mod
default: $(DESTDIR)/libwg-go.so
$(GRADLE_USER_HOME)/caches/golang/$(GO_TARBALL):
mkdir -p "$(dir $@)"
flock "$@.lock" -c ' \
[ -f "$@" ] && exit 0; \
curl -o "$@.tmp" "https://dl.google.com/go/$(GO_TARBALL)" && \
echo "$(GO_HASH_$(GO_PLATFORM)) $@.tmp" | sha256sum -c && \
mv "$@.tmp" "$@"'
$(BUILDDIR)/go-$(GO_VERSION)/.prepared: $(GRADLE_USER_HOME)/caches/golang/$(GO_TARBALL)
mkdir -p "$(dir $@)"
flock "$@.lock" -c ' \
[ -f "$@" ] && exit 0; \
tar -C "$(dir $@)" --strip-components=1 -xzf "$^" && \
patch -p1 -f -N -r- -d "$(dir $@)" < goruntime-boottime-over-monotonic.diff && \
touch "$@"'
$(PROTOC_GEN_GO): export GOARCH :=
$(PROTOC_GEN_GO): export GOOS :=
$(PROTOC_GEN_GO): export PATH := $(BUILDDIR)/go-$(GO_VERSION)/bin/:$(PATH)
$(PROTOC_GEN_GO): $(BUILDDIR)/go-$(GO_VERSION)/.prepared Makefile
go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.26
go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@v1.1
gen/%.pb.go: export PATH := $(GOPATH)/bin:$(PATH)
gen/%.pb.go: $(PROTODIR)/%.proto $(BUILDDIR)/go-$(GO_VERSION)/.prepared $(PROTOC_GEN_GO)
test -d gen || mkdir gen
$(PROTOC) -I $(PROTODIR) -I $(PROTO_INCLUDEDIR) --go_out=paths=source_relative:./gen $<
gen/%_grpc.pb.go: export PATH := $(GOPATH)/bin:$(PATH)
gen/%_grpc.pb.go: $(PROTODIR)/%.proto $(BUILDDIR)/go-$(GO_VERSION)/.prepared $(PROTOC_GEN_GO)
test -d gen || mkdir gen
$(PROTOC) -I $(PROTODIR) -I $(PROTO_INCLUDEDIR) --go-grpc_out=./gen --go-grpc_opt=paths=source_relative $<
$(DESTDIR)/libwg-go.so: export PATH := $(BUILDDIR)/go-$(GO_VERSION)/bin/:$(PATH)
$(DESTDIR)/libwg-go.so: $(BUILDDIR)/go-$(GO_VERSION)/.prepared go.mod api-android.go conntrack.go http-proxy.go nat-tun.go service.go gen/libwg.pb.go gen/libwg_grpc.pb.go jni.c
go build -tags linux -ldflags="-X golang.zx2c4.com/wireguard/ipc.socketDirectory=/data/data/$(ANDROID_PACKAGE_NAME)/cache/wireguard" -v -trimpath -o "$@" -buildmode c-shared
.DELETE_ON_ERROR:
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