为 Android arm32 v7 平台交叉编译时报错

[sb-child]

背景

我正在尝试为一个 Android 设备(armv7 32位CPU)编译 v2ray, 以在shell中运行。但是编译时报错。
使用release中为linux平台预编译的版本( https://github.com/v2fly/v2ray-core/releases/download/v5.1.0/v2ray-linux-arm32-v7a.zip )时，会出现域名解析问题(类似于 #1250 )

重现步骤

系统和相关软件版本:

$ uname -a
Linux myArchLinux 5.19.12-hardened1-1-hardened #1 SMP PREEMPT_DYNAMIC Fri, 30 Sep 2022 22:37:00 +0000 x86_64 GNU/Linux
$ go version  
go version go1.19.1 linux/amd64
$ gcc --version               
gcc (GCC) 12.2.0
Copyright © 2022 Free Software Foundation, Inc.
v2ray-core$ git log
commit 5e8f5b38b6f04410329f5859e769236fdca65181 (grafted, HEAD -> master, origin/master, origin/HEAD)

1. 克隆仓库 $ git clone https://github.com/v2fly/v2ray-core.git --depth 1 && cd v2ray-core
2. 下载依赖 $ go mod download
3. 编译 $ GOOS=android GOARCH=arm CGO_ENABLED=0 GOARM=7 go build -o v2ray-android-arm32v7 -trimpath -ldflags "-s -w -buildid=" ./main
4. 报错:

# github.com/v2fly/v2ray-core/v5/main
loadinternal: cannot find runtime/cgo
/usr/lib/go/pkg/tool/linux_amd64/link: running gcc failed: exit status 1
gcc: 错误：unrecognized command-line option ‘-marm’; did you mean ‘-mabm’?

补充

为 Android arm64, Linux arm32 和 Linux arm64 平台交叉编译时不会报错，此编译报错似乎仅限于 Android arm32 :

$ GOOS=android GOARCH=arm64 CGO_ENABLED=0 GOARM=7 go build -o v2ray-android-arm64v7 -trimpath -ldflags "-s -w -buildid=" ./main
$ file v2ray-android-arm64v7
v2ray-android-arm64v7: ELF 64-bit LSB pie executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /system/bin/linker64, stripped

$ GOOS=android GOARCH=arm CGO_ENABLED=0 GOARM=5 go build -o v2ray-android-arm32v5 -trimpath -ldflags "-s -w -buildid=" ./main
# github.com/v2fly/v2ray-core/v5/main
loadinternal: cannot find runtime/cgo
/usr/lib/go/pkg/tool/linux_amd64/link: running gcc failed: exit status 1
gcc: 错误：unrecognized command-line option ‘-marm’; did you mean ‘-mabm’?

$ GOOS=linux GOARCH=arm64 CGO_ENABLED=0 GOARM=7 go build -o v2ray-linux-arm64v7 -trimpath -ldflags "-s -w -buildid=" ./main
$ file v2ray-linux-arm64v7
v2ray-linux-arm64v7: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), statically linked, stripped

$ GOOS=linux GOARCH=arm CGO_ENABLED=0 GOARM=7 go build -o v2ray-linux-arm32v7 -trimpath -ldflags "-s -w -buildid=" ./main 
$ file v2ray-linux-arm32v7
v2ray-linux-arm32v7: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), statically linked, stripped

[dyhkwong]

CGO is required on Android non-ARM64, and is required for the DNS issue you mentioned. You need to download Android NDK and set CC like CC=$NDK_ROOT/{ndk_version}/toolchains/llvm/prebuilt/{platform}-x86_64/bin/armv7a-linux-androideabi{version}-clang and build with CGO_ENABLED=1.