Yocto无法交叉编译GoLang Wails应用的解决方法咨询

我正在使用Yocto Kirkstone为ARMv7自定义嵌入式Linux板构建系统，Yocto元层中包含Go Runtime 1.20版本。尝试构建一个简单的Go语言Wails示例应用，该应用能在Mac上为目标平台构建，但需要安装Wails CLI才能编译。不清楚如何在Yocto中交叉编译该应用，特此寻求解决方法。

在do_compile()中执行wails build .命令失败，报错信息如下：

...
| HASH[link github.com/wailsapp/wails/v2/cmd/wails]: "packagefile internal/lazyregexp=PNiPFusr6BDvpzrFOO2q
"
| HASH[link github.com/wailsapp/wails/v2/cmd/wails]: 58443e84e42fc0e5254356b82561065095a39a1606a457c34cf63d8dd364173c
| HASH subkey a9f4ce5dc6a5c97cab06b5c8cfec3a64e5db0f7bcc79e02fc0002cafcc719a67 "link-stdout" = 80ee6464b934ca7407296396849147804b0862ee25e2b844a6e9cc98cfa588b3
| qemu-arm: Could not open '/lib/ld-linux-armhf.so.3': No such file or directory
| WARNING: /home/sensonix/poky/build-microchip/tmp/work/cortexa5t2hf-neon-vfpv4-poky-linux-gnueabi/go-example/1.0.0-r0/temp/run.do_compile.87405:178 exit 255 from './bin/linux_arm/wails build .'
| WARNING: Backtrace (BB generated script):
|       #1: do_compile, /home/sensonix/poky/build-microchip/tmp/work/cortexa5t2hf-neon-vfpv4-poky-linux-gnueabi/go-example/1.0.0-r0/temp/run.do_compile.87405, line 178
|       #2: main, /home/sensonix/poky/build-microchip/tmp/work/cortexa5t2hf-neon-vfpv4-poky-linux-gnueabi/go-example/1.0.0-r0/temp/run.do_compile.87405, line 186

对应的Bitbake配方如下：

DESCRIPTION = "Wails Example App"
LICENSE = "CLOSED"
LIC_FILES_CHKSUM=""

SRC_URI = "file://wails.json"
SRC_URI += "file://README.md"
SRC_URI += "file://main.go"
SRC_URI += "file://app.go"
SRC_URI += "file://frontend"

GO_IMPORT = "import"
GO_LINKSHARED = ""
PTEST_ENABLED="0"
export GO111MODULE="auto"
CGO_ENABLED = "1"

inherit go goarch

do_compile() {

    cd ${WORKDIR}/build
    export TMPDIR="${GOTMPDIR}"

    ${GO} install github.com/wailsapp/wails/v2/cmd/wails@latest

    export GOPATH="$GOPATH:${S}/src/import/.gopath"

    # Pass the needed cflags/ldflags so that cgo
    # can find the needed headers files and libraries
    export CGO_CFLAGS="${CFLAGS} --sysroot=${STAGING_DIR_TARGET}"
    export CGO_LDFLAGS="${LDFLAGS} --sysroot=${STAGING_DIR_TARGET}"

    ./bin/linux_arm/wails build .

    #${GO} build ${GO_LINKSHARED} ${GOBUILDFLAGS} -o streamerapp

    cd ${OLDPWD}

}

do_install() {

    cd ${WORKDIR}/build
    #install -m <permisions> SRC DEST

    mkdir -p ${D}${bindir}
    #install -m 0755 ./wailsapp ${D}${bindir}

    cd ${OLDPWD}

}

1. 修复QEMU动态链接器找不到的问题 #

报错核心是QEMU无法定位目标ARM架构的动态链接器，需在do_compile中添加环境变量指定目标sysroot：

export QEMU_LD_PREFIX="${STAGING_DIR_TARGET}"

同时确保构建环境已包含meta-oe层，该层提供QEMU交叉支持组件，且qemu-arm-static已安装。

2. 调整Wails CLI的使用方式 #

直接编译ARM版本的Wails CLI并运行会依赖目标架构库，易出兼容性问题，可改为：

• 编译**主机架构（x86_64）**的Wails CLI，无需QEMU即可直接运行：

  GOOS=linux GOARCH=amd64 ${GO} install github.com/wailsapp/wails/v2/cmd/wails@latest
  

• 调用主机版CLI执行交叉编译，指定目标平台：

  ${GOPATH}/bin/wails build -platform linux/arm/v7 .
  

3. 完善交叉编译环境变量 #

确保Go与CGO的交叉编译参数正确：

export GOOS=linux
export GOARCH=arm
export GOARM=7
export CGO_ENABLED=1
# 指定目标架构的交叉编译器
export CC="${TARGET_PREFIX}gcc"
export CXX="${TARGET_PREFIX}g++"

4. 修改后的Bitbake配方示例 #

更新do_compile部分如下：

do_compile() {
    cd ${WORKDIR}/build
    export TMPDIR="${GOTMPDIR}"

    # 编译主机版本的Wails CLI
    GOOS=linux GOARCH=amd64 ${GO} install github.com/wailsapp/wails/v2/cmd/wails@latest
    export GOPATH="$GOPATH:${S}/src/import/.gopath"

    # 配置交叉编译环境
    export GOOS=linux
    export GOARCH=arm
    export GOARM=7
    export CGO_ENABLED=1
    export CC="${TARGET_PREFIX}gcc"
    export CXX="${TARGET_PREFIX}g++"
    export CGO_CFLAGS="${CFLAGS} --sysroot=${STAGING_DIR_TARGET}"
    export CGO_LDFLAGS="${LDFLAGS} --sysroot=${STAGING_DIR_TARGET}"
    export QEMU_LD_PREFIX="${STAGING_DIR_TARGET}"

    # 交叉编译Wails应用
    ${GOPATH}/bin/wails build -platform linux/arm/v7 .

    cd ${OLDPWD}
}

5. 添加应用依赖库 #

Wails应用依赖GTK3等UI库，需在配方中添加依赖：

DEPENDS += "gtk3 glib-2.0"

内容的提问来源于stack exchange，提问作者PhilBot